JP7153251B2 - Infusion container using a laminate and a lid material composed of the laminate - Google Patents

Description

TECHNICAL FIELD The present invention relates to a laminate and an infusion container using a lid member composed of the laminate.

2. Description of the Related Art Conventionally, infusion containers such as infusion bags have been on the market as infusion containers used for drip infusion and the like. The infusion container is provided with a mouth portion for taking out the content of the infusion. In order to ensure sanitation of the infusion container, for example, Patent Document 1 proposes providing a peel-off cover on the mouth portion.

JP 2003-220117 A

The cover provided on the mouth of the infusion container may be damaged due to impact applied during transportation of the infusion container. In this case, it is conceivable that germs may enter the inside of the infusion container through a damaged portion such as a hole, making it impossible to ensure sanitation. Therefore, the cover material is required to have a certain strength such as piercing strength.

An object of the present invention is to provide a laminate that can effectively solve such problems.

The present invention is a laminate comprising at least a first substrate, a second substrate and a sealant layer having easy peelability in this order, wherein the second substrate comprises 51% by mass or more of polyethylene terephthalate or 51% by mass of polyethylene terephthalate When polybutylene terephthalate is contained in an amount of 51% by mass or more and the second substrate contains polyethylene terephthalate in an amount of 51% by mass or more, the first substrate contains 51% by mass or more of polybutylene terephthalate, and the first substrate is And the substrate containing 51% by mass or more of polybutylene terephthalate in the second substrate is a stretched film having a single layer structure having an IV value of 1.10 dl / g or more and 1.35 dl / g or less, It is a laminate.

In the laminate according to the present invention, the base material containing 51% by mass or more of polybutylene terephthalate in the first base material and the second base material may also contain polyethylene terephthalate.

In the laminate according to the present invention, the content of polyethylene terephthalate in the substrate containing 51% by mass or more of polybutylene terephthalate in the first substrate and the second substrate may be 30% by mass or less. .

In the laminate according to the present invention, the laminate may have a puncture strength of 13 N or more.

In the laminate according to the present invention, the first substrate may contain 51% by mass or more of polybutylene terephthalate, and the second substrate may contain 51% by mass or more of polyethylene terephthalate.

In the laminate according to the present invention, the first substrate may contain 51% by mass or more of polyethylene terephthalate, and the second substrate may contain 51% by mass or more of polybutylene terephthalate.

The laminate according to the present invention may further include a printed layer positioned between the first substrate and the second substrate.

In the laminate according to the present invention, the sealant layer may contain polyethylene and polypropylene.

In the laminate according to the present invention, at least a transparent vapor deposition layer provided on at least one of the first base material and the second base material between the first base material and the second base material It may further comprise a barrier layer comprising:

In the laminate according to the present invention, the transparent vapor deposition layer contains aluminum oxide, and at least one of the first substrate and the second substrate provided with the transparent vapor deposition layer, and the transparent vapor deposition layer A covalent bond between an aluminum atom and a carbon atom may be formed at the interface between .

In the laminate according to the present invention, the barrier layer may further include a gas barrier coating film provided on the surface of the transparent deposition layer.

The present invention is an infusion container, comprising: a bag; an opening containing a resin provided in the bag; is a container.

The transport container according to the present invention may further include a first sealing portion that joins the mouth portion and the lid member, and the sealing strength of the first sealing portion at 23° C. may be 20 N/15 mm or less.

According to the present invention, it is possible to provide a laminate with improved puncture resistance and suppressed elution of caprolactam.

1 is a front view showing an infusion container according to an embodiment of the present invention; FIG. Fig. 4 is a bottom view showing an enlarged mouth portion of the infusion container according to the embodiment of the present invention; FIG. 2 is a cross-sectional view showing an example of the layer structure of a laminate that constitutes a bag; FIG. 4 is a cross-sectional view showing an example of a layer structure of a first film of a laminate; It is a figure which shows an example of the method of preparing the test piece for measuring seal strength. FIG. 10 is a cross-sectional view showing another example of the layer structure of the laminate that constitutes the bag; FIG. 10 is a cross-sectional view showing another example of the layer structure of the laminate that constitutes the bag; It is a figure which shows an example of the measuring method of a puncture strength. FIG. 2 is a diagram showing layer structures and evaluation results of Examples 1 to 4 and Comparative Examples 1 and 2;

(First embodiment)
An embodiment of the present invention will be described below with reference to the drawings. In addition, in the drawings attached to this specification, for convenience of illustration and easy understanding, the scale, the ratio of length and width, etc. are appropriately changed and exaggerated from those of the real thing.

In addition, terms such as "perpendicular" and "identical", length and angle values, etc. that specify shapes and geometric conditions and their degrees used in this specification are bound by strict meanings. However, it is interpreted to include the extent to which similar functions can be expected.

An infusion container 10 according to this embodiment will be described. FIG. 1 is a front view showing an infusion container 10 according to this embodiment. Note that FIG. 1 shows the infusion container 10 in a state before it is filled with contents (a state in which no contents are contained). The configuration of the infusion container 10 will be described below.

Infusion Container As shown in FIG. 1 , the infusion container 10 includes a bag 11 , a mouth portion 12 provided on the bag 11 , and a lid member 13 provided on the mouth portion 12 . Bag 11 contains an infusion solution therein. The infusion solution contained in bag 11 is taken out from mouth 12 . The cover member 13 is provided on the mouth portion 12 so as to cover the mouth portion 12 before the infusion is taken out from the mouth portion 12 . Each component of the infusion container 10 will be described below.

The bag 11 is formed by laminating resin films 11a at the ends to form a second seal portion 11b, and is formed into a bag shape. The bag 11 includes a storage portion 11c that stores an infusion solution. The bag 11 has, for example, a substantially rectangular contour in a front view.

The mouth portion 12 is a plastic molding made by molding plastic. The mouth portion 12 has, for example, a tubular shape. One end of the mouth portion 12 is sandwiched between the films 11 a forming the bag 11 . Furthermore, the mouth portion 12 is attached to the bag 11 by joining the side surface of the portion of the mouth portion 12 sandwiched between the films 11a to the film 11a. A portion where the mouth portion 12 and the film 11a are joined is also referred to as a third sealing portion 15 .

The mouth portion 12 contains resin. The material of the mouth portion 12 is not particularly limited as long as it contains a resin and can form a seal portion between the film 11a and the lid member 13 described later. Examples include polyphenylene oxide, polyethylene terephthalate, and polypropylene. is.

Components provided inside the mouth portion 12 will be described. FIG. 2 is an enlarged bottom view showing the mouth portion 12 of the infusion container 10. As shown in FIG. Here, in FIG. 2, only the outline of the cover member 13, which will be described later, is shown, and the inside of the mouth portion 12 is also shown. As shown in FIG. 2 , a mouth plug 14 is arranged inside the cylindrical mouth 12 . The plug 14 is formed with a cylindrical portion 14a having a bottom.

Next, the lid member 13 will be described. As shown in FIG. 1 , the lid member 13 is provided on the mouth portion 12 so as to cover the other end of the mouth portion 12 . Specifically, the lid member 13 is joined to the end face (hereinafter also referred to as the bottom face) of the mouth portion 12 on the other end side. A portion that joins the bottom surface of the mouth portion 12 and the lid member 13 is also referred to as a first sealing portion 16 . By sealing the bottom surface of the mouth portion 12 with the cover member 13, it is possible to reduce the risk of foreign matter entering the housing portion 11c of the infusion container 10 through the mouth portion 12, thereby improving the hygiene of the housing portion 11c. can be made

A method of using the infusion container 10 will be described. First, the lid member 13 is peeled off from the mouth portion 12 to expose the mouth plug 14 inside the mouth portion 12 . Next, an infusion tube with a puncture needle provided at one end is prepared, and the plug 14 is punctured with the puncture needle. Since the tubular portion 14a is formed in the plug 14, the puncture needle provided at one end of the infusion tube can be pierced through the tubular portion 14a. By piercing the plug 14 with the puncture needle, the inside of the container 11c and the inside of the infusion tube can be communicated, and the infusion can be taken out from the infusion container 10 through the infusion tube.

Layer Structure of Laminate Constituting Lid Material Next, the layer structure of the lid material 13 will be described. FIG. 3 is a cross-sectional view showing an example of a laminate 30 forming the lid member 13. As shown in FIG.

As shown in FIG. 3, the laminate 30 includes at least a first film 40, a second film 50 and a third film 60 in this order. The first film 40 is positioned on the outer surface 30y side, and the third film 60 is positioned on the inner surface 30x side opposite to the outer surface 30y. The inner surface 30x is a surface positioned on the accommodating portion 11c side.

The first film 40 includes at least a first substrate 41, as shown in FIG. The second film 50 includes at least a second substrate 51 . Third film 60 includes at least sealant layer 61 . Also, the first film 40 and the second film 50 are bonded by the first adhesive layer 45 , and the second film 50 and the third film 60 are bonded by the second adhesive layer 55 . Therefore, the laminate 30 according to the second embodiment has, from the outer surface side to the inner surface side, first base material/first adhesive layer/second base material/second adhesive layer/sealant layer,
It can be said that it has Note that "/" represents a boundary between layers. Although not shown, a printed layer may be provided on the first base material 41 or the second base material 51 between the first base material 41 and the second base material 51 .

The first film 40, the first adhesive layer 45, the second film 50, the second adhesive layer 55 and the third film 60 will be described in detail below.

(First film)
In the example shown in FIG. 3 , the first film 40 includes a first substrate 41 forming the outer surface 30y of the laminate 30. In the example shown in FIG.

[First base material]
The first base material 41 contains polybutylene terephthalate (hereinafter also referred to as PBT) as a main component. For example, the first base material 41 contains 51% by mass or more of PBT. Advantages of the first base material 41 containing PBT will be described below.

PBT has good dimensional stability and therefore good printability. Therefore, as in the case of polyethylene terephthalate (hereinafter also referred to as PET), a printed layer can be provided on the first base material 41 containing PBT.

Moreover, PBT is excellent in heat resistance. Therefore, deformation of the first base material 41 and reduction in strength of the first base material 41 can be suppressed when a container using the lid member 13 is subjected to sterilization treatment such as boiling treatment or retort treatment. can be done. The retort treatment is a process of heating the infusion container 10 under pressure after filling the infusion container 10 with contents and sealing the infusion container 10 . The temperature of the retort treatment is, for example, 120° C. or higher. The boiling process is a process of filling the contents into the infusion container 10, sealing the infusion container 10, and then heating the infusion container 10 in hot water under atmospheric pressure. The boiling treatment temperature is, for example, 90° C. or higher and 100° C. or lower.

PBT also has high strength. Therefore, similarly to the case where the laminate 30 constituting the lid member 13 contains nylon, the lid member 13 can be provided with piercing resistance.

In addition, PBT has the characteristic of being less likely to absorb moisture than nylon. Therefore, it is possible to prevent the first base material 41 from absorbing moisture and lowering the lamination strength of the laminate 30 .

The configuration of the first base material 41 containing PBT will be described in detail below. As the configuration of the first base material 41 containing PBT in the present embodiment, either the following first configuration or second configuration may be employed.

[First configuration of base material]
The content of PBT in the first base material 41 according to the first configuration is preferably 51% by mass or more, more preferably 60% by mass or more, further preferably 70% by mass or more, particularly preferably 75% by mass or more, and most preferably 75% by mass or more. Preferably, it is 80% by mass or more. By setting the PBT content to 51% by mass or more, the first film 40 can have excellent impact strength and pinhole resistance.

PBT used as a main component preferably contains 90 mol% or more, more preferably 95 mol% or more, still more preferably 98 mol% or more, and most preferably 100% terephthalic acid as a dicarboxylic acid component. in mol %. 1,4-Butanediol is preferably 90 mol % or more, more preferably 95 mol % or more, still more preferably 97 mol % or more, and most preferably 1,4-butanediol as a glycol component during polymerization. It does not contain anything other than by-products produced by the ether bond of butanediol.

The first base material 41 may contain a polyester resin other than PBT. This makes it possible to adjust the film formability and the mechanical properties of the first substrate 41 when the film-like first substrate 41 is biaxially stretched, for example.
Polyester resins other than PBT include polyester resins such as PET, polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), and polypropylene terephthalate (PPT), as well as isophthalic acid, orthophthalic acid, naphthalenedicarboxylic acid, and biphenyldicarboxylic acid. , PBT resins copolymerized with dicarboxylic acids such as cyclohexanedicarboxylic acid, adipic acid, azelaic acid, and sebacic acid, ethylene glycol, 1,3-propylene glycol, 1,2-propylene glycol, neopentyl glycol, 1,5 Examples include PBT resins obtained by copolymerizing diol components such as -pentanediol, 1,6-hexanediol, diethylene glycol, cyclohexanediol, polyethylene glycol, polytetramethylene glycol, and polycarbonate diol.

The addition amount of these polyester resins other than PBT is preferably 49% by mass or less, more preferably 40% by mass or less. If the amount of the polyester resin other than PBT added exceeds 49% by mass, the mechanical properties of PBT may be impaired, and impact strength, pinhole resistance, and drawability may become insufficient.

The first base material 41 may contain, as an additive, a polyester-based or polyamide-based elastomer obtained by copolymerizing at least one of a flexible polyether component, a polycarbonate component, and a polyester component. This can improve pinhole resistance when bent. The additive amount is, for example, 20% by mass. If the additive amount exceeds 20% by mass, the effect of the additive may be saturated, or the transparency of the first base material 41 may be reduced.

An example of a method for producing the film-like first substrate 41 according to the first configuration will be described. Here, a method for producing the film-like first substrate 41 by a casting method will be described. More specifically, a method of casting multiple layers of resin having the same composition at the time of casting will be described.

Since PBT has a high crystallization speed, crystallization proceeds even during casting. At this time, if a single layer is cast without multilayering, there is no barrier that can suppress the growth of crystals, so the crystals grow to a large size, resulting in an unstretched raw roll. yield stress is higher. For this reason, it becomes easy to break when biaxially stretching an unstretched raw fabric. Moreover, the yield stress of the obtained biaxially stretched film becomes high, and the formability of the biaxially stretched film becomes insufficient.
On the other hand, if the same resin is multi-layered during casting, the stretching stress of the unstretched sheet can be reduced. Therefore, stable biaxial stretching becomes possible, and the yield stress of the obtained biaxially stretched film becomes low. This makes it possible to obtain a film that is flexible and has high breaking strength.

FIG. 4 is a cross-sectional view showing an example of the layer structure of the first film. When the first base material 41 is produced by casting a resin in multiple layers, as shown in FIG. . Each of the multiple layers 41a contains PBT as a main component. For example, each of the layers 41a preferably contains 51% by mass or more of PBT, more preferably 60% by mass or more of PBT. In the plurality of layers 41a, the n+1th layer 41a is directly laminated on the nth layer 41a. That is, no adhesive layer or adhesive layer is interposed between the layers 41a.

The reason why the properties of the PBT film are improved by multilayering is presumed as follows. When resins are laminated, even if the resin compositions are the same, interfaces between layers exist, and the interfaces accelerate crystallization. On the other hand, the growth of large crystals beyond the thickness of the layer is suppressed. For this reason, it is considered that the size of the crystals (spherulites) becomes smaller.

As a specific method for reducing the size of spherulites by multilayering, a general multilayering device (multilayer feed block, static mixer, multilayer multi-manifold, etc.) can be used. For example, a method of laminating thermoplastic resins fed from different flow paths using two or more extruders into multiple layers using a feed block, a static mixer, a multi-manifold die, or the like can be used. In the case of multilayering resins of the same composition, it is also possible to use only one extruder and introduce the multilayering device described above into the melt line from the extruder to the die.

The first base material 41 is composed of a multilayer structure including at least 10 layers or more, preferably 60 layers or more, more preferably 250 layers or more, still more preferably 1000 layers or more. By increasing the number of layers, the size of the spherulites in the unstretched original PBT can be reduced, and the subsequent biaxial stretching can be stably carried out. Moreover, the yield stress of PBT in the state of a biaxially stretched film can be reduced. Preferably, the diameter of the spherulites in the unstretched raw PBT is 500 nm or less.

When a biaxially stretched film is produced by biaxially stretching an unstretched raw PBT film, the stretching temperature (hereinafter also referred to as MD stretching temperature) in the longitudinal stretching direction (hereinafter, MD) is preferably 40 ° C. or higher. and more preferably 45° C. or higher. By setting the MD stretching temperature to 40° C. or higher, it is possible to suppress the occurrence of breakage of the film. Also, the MD stretching temperature is preferably 100° C. or lower, more preferably 95° C. or lower. By setting the MD stretching temperature to 100° C. or lower, it is possible to suppress the phenomenon that the orientation of the biaxially stretched film does not occur.

The draw ratio in MD (hereinafter also referred to as MD draw ratio) is preferably 2.5 times or more. This makes it possible to orient the biaxially stretched film and achieve good mechanical properties and a uniform thickness. The MD draw ratio is, for example, 5 times or less.

The stretching temperature (hereinafter also referred to as TD stretching temperature) in the lateral stretching direction (hereinafter also referred to as TD) is preferably 40° C. or higher. By setting the TD stretching temperature to 40° C. or higher, it is possible to suppress the occurrence of breakage of the film. Moreover, the TD stretching temperature is preferably 100° C. or less. By setting the TD stretching temperature to 100° C. or lower, it is possible to suppress the phenomenon that the biaxially stretched film is not oriented.

The draw ratio in TD (hereinafter also referred to as TD draw ratio) is preferably 2.5 times or more. This makes it possible to orient the biaxially stretched film and achieve good mechanical properties and a uniform thickness. The MD draw ratio is, for example, 5 times or less.

The TD relaxation rate is preferably 0.5% or more. Thereby, it is possible to suppress the occurrence of breakage during heat setting of the biaxially stretched film of PBT. Also, the TD relaxation rate is preferably 10% or less. As a result, it is possible to suppress the occurrence of unevenness in thickness due to sagging or the like in the biaxially stretched PBT film.

The thickness of the layer 41a of the first substrate 41 shown in FIG. 4 is preferably 3 nm or more, more preferably 10 nm or more. Also, the thickness of the layer 41a is preferably 200 nm or less, more preferably 100 nm or less.
Also, the thickness of the first base material 41 is preferably 9 μm or more, more preferably 12 μm or more. Also, the thickness of the first base material 41 is preferably 25 μm or less, more preferably 20 μm or less. By setting the thickness of the first base material 41 to 9 μm or more, the first base material 41 has sufficient strength. Further, by setting the thickness of the first base material 41 to 25 μm or less, the first base material 41 exhibits excellent moldability. Therefore, the process of manufacturing the lid member 13 by processing the laminate 30 including the first base material 41 can be efficiently carried out.

[Second configuration of base material]
The first base material 41 according to the second configuration is composed of a single-layer film containing polyester having butylene terephthalate as a main repeating unit. For example, the first base material 41 is mainly composed of 1,4-butanediol or an ester-forming derivative thereof as a glycol component and terephthalic acid or an ester-forming derivative thereof as a dibasic acid component. Including homo- or copolymer-type polyesters obtained by condensation. The content of PBT in the first base material 41 according to the second configuration is preferably 51% by mass or more, more preferably 60% by mass or more, still more preferably 70% by mass or more, and further preferably 80% by mass or more. Most preferably, it is 90% by mass or more. Moreover, it is preferable that the first base material 41 according to the second configuration is composed only of polybutylene terephthalate and an additive.

In order to impart mechanical strength to the first base material 41, PBT preferably has a melting point of 200° C. or higher and 250° C. or lower and an IV value of 1.10 dl/g or higher and 1.35 dl/g or lower. . Furthermore, those having a melting point of 215° C. or more and 225° C. or less and an IV value of 1.15 dl/g or more and 1.30 dl/g or less are particularly preferable. These IV values may be satisfied by the entire material that constitutes first substrate 41 . IV values can be calculated based on JIS K 7367-5:2000.

The first base material 41 according to the second configuration may contain a polyester resin other than PBT, such as PET, in a range of 30% by mass or less. Since the first base material 41 contains PET in addition to PBT, crystallization of PBT can be suppressed, and the stretchability of the PBT film can be improved. As the PET mixed with the PBT of the first base material 41, polyester having ethylene terephthalate as a main repeating unit can be used. For example, a homotype containing ethylene glycol as a glycol component and terephthalic acid as a dibasic acid component as main components can be preferably used. In order to impart good mechanical strength properties, PET preferably has a melting point of 240° C. or more and 265° C. or less and an IV value of 0.55 dl/g or more and 0.90 dl/g or less. Furthermore, those having a melting point of 245° C. or more and 260° C. or less and an IV value of 0.60 dl/g or more and 0.80 dl/g or less are particularly preferable.
By setting the amount of PET to be 30% by mass or less, it is possible to prevent the stiffness of the unstretched raw fabric and stretched film from becoming too high. As a result, it is possible to prevent the stretched film from becoming brittle and the pressure resistance, impact strength, puncture strength, etc. of the stretched film from deteriorating. In addition, it is possible to suppress the occurrence of stretching failure when stretching an unstretched raw material.

The first base material 41 optionally contains a lubricant, an antiblocking agent, an inorganic extender, an antioxidant, an ultraviolet absorber, an antistatic agent, a flame retardant, a plasticizer, a coloring agent, a crystallization inhibitor, and a crystallization agent. Additives such as accelerators may be included. In addition, the polyester resin pellets used as the raw material of the first base material 41 have a moisture content of 0.05% by weight or less, preferably 0.01% by weight, before being heated and melted in order to avoid a decrease in viscosity due to hydrolysis during heating and melting. % or less before use after sufficiently pre-drying.

An example of a method for producing the film-like first substrate 41 according to the second configuration will be described.

In order to stably produce the film of the first base material 41 having the structure described above, it is important to suppress the growth of crystals in the state of the unstretched original sheet. Specifically, when the extruded PBT-based melt is cooled to form a film, the crystallization temperature range of the polymer is cooled at a certain rate or higher, that is, the original fabric cooling rate is an important factor. The raw fabric cooling rate is, for example, 200° C./second or higher, preferably 250° C./second or higher, and particularly preferably 350° C./second or higher. Since the unstretched raw material film-formed at a high cooling rate maintains a low crystallinity, the stability of bubbles during stretching is improved. Furthermore, film formation at high speed becomes possible, so the productivity of the film is also improved. If the cooling rate is less than 200° C./second, it is conceivable that the crystallinity of the obtained unstretched raw material is high and the stretchability is lowered. In extreme cases, the stretching bubble may burst and the stretching may not continue.

The unstretched raw sheet containing PBT as a main component is preferably conveyed to a space for biaxial stretching while maintaining the ambient temperature at 25°C or lower, preferably 20°C or lower. As a result, even when the residence time is long, the crystallinity of the unstretched raw sheet immediately after film formation can be maintained.

A biaxial stretching method for stretching an unstretched raw fabric to obtain a stretched film is not particularly limited. For example, the longitudinal direction and the transverse direction may be stretched simultaneously, or the longitudinal direction and the transverse direction may be successively stretched by a tubular method or a tenter method. Among these methods, the tubular method is particularly preferably employed because it is possible to obtain a stretched film having a good balance of physical properties in the circumferential direction.

In the tubular method, an unstretched raw material introduced into a stretching space is passed between a pair of low-speed nip rolls and then heated by a stretching heater while air is forced therein. After the stretching is finished, air is blown to the stretched film by a cooling shoulder air ring. The draw ratio is preferably 2.7 times or more and 4.5 times or less in MD and TD, respectively, in consideration of the stretching stability, strength properties, transparency, and thickness uniformity of the stretched film. By setting the stretching ratio to 2.7 times or more, it is possible to sufficiently secure the tensile modulus and impact strength of the stretched film. In addition, by setting the draw ratio to 4.5 times or less, it is possible to suppress the occurrence of excessive strain of the molecular chain due to stretching, and it is possible to suppress the occurrence of breakage and puncture during the stretching process, so the stretched film can be stabilized. can be made.

The stretching temperature is preferably 40° C. or higher and 80° C. or lower, and particularly preferably 45° C. or higher and 65° C. or lower. Since the unstretched raw fabric produced at the above-described high cooling rate has low crystallinity, the unstretched raw fabric can be stably stretched even when the stretching temperature is relatively low. Further, by setting the stretching temperature to 80° C. or lower, it is possible to suppress the shaking of the stretching bubble and obtain a stretched film with good thickness accuracy. In addition, by setting the stretching temperature to 40° C. or higher, it is possible to suppress the occurrence of excessive stretching orientation crystallization due to low-temperature stretching, thereby preventing whitening of the film.

The first base material 41 manufactured as described above is composed of, for example, a single layer containing polyester having butylene terephthalate as a main repeating unit. According to the production method described above, since the unstretched raw fabric is formed into a film at a high cooling rate, even when the unstretched raw fabric is composed of a single layer, it is possible to maintain a low crystalline state, Therefore, the unstretched raw fabric can be stably stretched.

(First adhesive layer)
The first adhesive layer 45 contains a first adhesive for bonding the first film 40 and the second film 50 together. Examples of the first adhesive include an ether-based two-component reactive adhesive and an ester-based two-component reactive adhesive.

Examples of the ether-based two-liquid reactive adhesive include polyether polyurethane. A polyether polyurethane is a cured product produced by reacting a polyether polyol as a main agent with an isocyanate compound as a curing agent. Examples of isocyanate compounds include aromatic isocyanate compounds such as tolylene diisocyanate (TDI), 4,4′-diphenylmethane diisocyanate (MDI), and xylylene diisocyanate (XDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), and the like. or adducts or polymers of the various isocyanate compounds described above can be used.

Examples of ester-based two-liquid reactive adhesives include polyester polyurethane and polyester. A polyester polyurethane is a cured product produced by reacting a polyester polyol as a main agent with an isocyanate compound as a curing agent. Examples of the isocyanate compound are the same as those for the ether-based adhesive described above.

(Second film)
The second film 50 includes at least a second substrate 51 . The second base material 51 contains PET as a main component. For example, the second base material 51 contains 51% by mass or more of PET.

Since the second base material 51 contains PET, the second base material 51 can have heat resistance. For example, the melting point of the second base material 51 is higher and the hygroscopicity of the second base material 51 is lower than when the second base material 51 contains nylon. As a result, when the infusion container 10 is heated, it is possible to prevent the second base material 51 from being perforated due to overheated water or the like. Moreover, the heat resistance of PET is higher than that of PBT. Therefore, according to the present embodiment, the heat resistance of the laminate 30 can be improved even when compared with the case where the second base material 51 is made of PBT. As a result, for example, it is possible to suppress deterioration in performance of the layered body 30 due to damage to the layered body 30 when the infusion container 10 is heated.

In addition, when the second base material 51 contains nylon, caprolactam, which is a raw material of nylon and whose elution standard is defined in Ministry of Health and Welfare Notification No. 370 “Instruments and Containers and Packaging”, etc., is used as the lid material 13. There is a risk of elution into the infusion container 10 and contamination with the contents. On the other hand, according to the present embodiment, by forming the second base material 51 from PET, it is possible to reduce the risk of elution of caprolactam or the like.

The thickness of the second base material 51 is preferably 9 μm or more, more preferably 12 μm or more. Also, the thickness of the second base material 51 is preferably 25 μm or less, more preferably 20 μm or less. By setting the thickness of the second base material 51 to 9 μm or more, the second base material 51 has sufficient strength. Further, by setting the thickness of the second base material 51 to 25 μm or less, the second base material 51 exhibits excellent moldability. Therefore, the process of manufacturing the lid member 13 can be efficiently carried out.

(Second adhesive layer)
The second adhesive layer 55 contains a second adhesive for bonding the second film 50 and the third film 60 together. An example of the second adhesive is an ether-based two-liquid reactive adhesive. As the ether-based two-liquid reactive adhesive, polyurethane and the like can be used, as in the case of the first adhesive. Polyurethane is a cured product produced by reacting a polyol as a main agent with an isocyanate compound as a curing agent. As the polyol, polyether polyol or polyester polyol can be used, but polyester polyol is preferably used.

Isocyanate compounds include aromatic isocyanate compounds and aliphatic isocyanate compounds, as described above. Among them, the aromatic isocyanate compound elutes components that cannot be used for pharmaceuticals, foods, and the like in a high-temperature environment such as heat sterilization. By the way, the second adhesive layer 55 is in contact with the third film 60 as shown in FIG. Therefore, when the second adhesive layer 55 contains an aromatic isocyanate compound, the component eluted from the aromatic isocyanate compound is absorbed into the contents of the infusion container 10 having the lid member 13 made of the laminate 30. It may adhere.

In consideration of such problems, as the second adhesive constituting the second adhesive layer 55, a cured product produced by reacting a polyol as a main agent and an aliphatic isocyanate compound as a curing agent is used. Suggest using This prevents the second adhesive layer 55 from adhering to the content of the infusion container 10 , which is caused by the second adhesive layer 55 and which cannot be used for pharmaceuticals, foods, and the like.

(Third film)
The third film 60 includes at least a sealant layer 61 forming the inner surface 30x of the laminate 30. As shown in FIG.
[Sealant layer]
As a material constituting the sealant layer 61, one or more resins selected from polyethylene such as low-density polyethylene, linear low-density polyethylene, and polypropylene can be used. The sealant layer 61 may be a single layer or multiple layers. Alternatively, the sealant layer 61 may be composed of an unstretched film.

The sealant layer 61 is configured such that the seal strength of the first seal portion 16 formed by welding the inner surface 30x of the laminate 30 to the mouth portion 12 is 20 N/15 mm or less at 23°C. In other words, the sealant layer 61 has a so-called easy peel property. The easy peel property can be realized by, for example, forming the sealant layer 61 with two or more kinds of resins and making one resin incompatible with the other resin. For example, sealant layer 61 includes polyethylene and polypropylene.

Since the sealant layer 61 has easy peelability, the seal strength of the first seal portion 16 can be reduced. Therefore, when using a container using the lid member 13, the lid member 13 can be more easily peeled off from the container.

The sealant layer 61 may contain a propylene-ethylene block copolymer. For example, the film constituting the sealant layer is an unstretched film containing a propylene/ethylene block copolymer as a main component. The sealant layer 61 may also contain polypropylene such as propylene-ethylene random copolymer or homopolypropylene.

A method for measuring the seal strength of the first seal portion 16 in FIG. 1 will be described below. FIG. 5 is an enlarged bottom view showing the lid member 13 of the infusion container 10, and shows an example of a method of preparing a test piece 90 for measuring the seal strength. In FIG. 5, the outline of the lid member 13 is indicated by solid lines, and the outer edge of the bottom surface of the opening 12 is indicated by broken lines.

First, as shown in FIG. 5, a portion of the lid member 13 joined to the mouth portion 12 is formed into a substantially rectangular shape having a first side 91, a second side 92, a third side 93 and a fourth side 94. A test piece 90 is cut out. The first side 91 is part of the outer edge of the lid member 13 . The second side 92 is a side facing the first side 91 . The third side 93 extends between one end of the first side 91 and one end of the second side 92 , and the fourth side 94 extends between the other end of the first side 91 and the other end of the second side 92 . is the side extending between The direction in which the third side 93 and the fourth side 94 extend is the longitudinal direction of the test piece 90 .

A width S1 of the first seal portion 16 in the width direction of the test piece 90 (direction orthogonal to the longitudinal direction of the test piece 90) is, for example, 6 mm. A length S2 of the first seal portion 16 in the longitudinal direction of the test piece 90 is, for example, 3 mm or more. Moreover, the length S3 of the test piece 90 in the longitudinal direction is, for example, 10 mm or more.

Subsequently, the seal strength of the first seal portion 16 is measured according to JIS Z 0238. As a measuring instrument, for example, a tensile tester RTC-1310A manufactured by Orientec can be used.

First, the second side 92 side of the cover member 13 of the test piece 90 and the mouth portion 12 are respectively gripped by opposing grips in the measuring instrument. Also, the opposing grippers are pulled in opposite directions in the normal direction of the bottom surface of the mouth portion 12 at a rate of 300 mm/min, and the maximum value of the tensile stress is measured.

For example, the maximum value of the tensile stress of five test pieces 90 is measured, and the average value can be used as the seal strength of the first seal portion 16 . The spacing between the opposing grippers when starting pulling is, for example, 12 mm, and the spacing between the opposing gripping tools when ending pulling is, for example, 18 mm or more.

[Print layer]
As described above, a printed layer may be provided on the first base material 41 or the second base material 51 between the first base material 41 and the second base material 51 . When the printed layer is provided on the first substrate 41 , the printed layer is included in the first film 40 . Moreover, when the printed layer is provided on the second substrate 51 , the printed layer is included in the second film 50 .

The printed layer is a layer provided by printing in order to indicate product information on the cover member 13, to give the cover member 13 an aesthetic appearance, and to make the cover member 13 easily visible. The print layer expresses characters, numbers, symbols, graphics, patterns, and the like. In the printed layer, layers of multiple colors are spread out in the same plane. Gravure printing ink and flexographic printing ink can be used as the material forming the printing layer. A specific example of the ink for gravure printing is FINART manufactured by DIC Graphics Corporation.

The printed layer may be at least partially a solid layer. A solid layer is a printed layer having a region where the area ratio of halftone dots is 100%. An example of the solid layer is a white solid layer in which the area ratio of white halftone dots is 100%.

Since the layered body included in the lid material 13 has the printed layer, the lid material 13 is colored, and the lid material 13 becomes easy to visually recognize. Therefore, the user of the container including the lid member 13 can easily confirm whether or not the lid member 13 has been peeled off.

Method for Manufacturing First Film Next, an example of a method for manufacturing the first film 40 will be described.

First, a resin material containing PBT as a main component is prepared. Subsequently, the film-like first substrate 41 is produced by extruding the resin material by a melt extrusion method such as a casting method or a tubular method. Thus, the first film 40 including the first substrate 41 can be obtained.

Method for Manufacturing Laminate Next, an example of a method for manufacturing the laminate 30 will be described.

First, the above-described first film 40 and second film 50 are prepared. Subsequently, the first film 40 and the second film 50 are laminated via the first adhesive layer 45 by a dry lamination method. After that, the laminate including the first film 40 and the second film 50 and the third film 60 are laminated via the second adhesive layer 55 by a dry lamination method. Thereby, the laminate 30 including the first film 40, the second film 50 and the third film 60 can be obtained.

Alternatively, first, the second film 50 and the third film 60 are laminated via the second adhesive layer 55, and then the first film 40 and the laminate including the second film 50 and the third film 60 are laminated together. The laminate 30 may be manufactured by laminating with one adhesive layer 45 interposed.

Manufacturing Method of Infusion Container A lid member 13 composed of the laminate 30 described above is prepared. In addition, the bag 11 is integrated with the mouth portion 12 in which the mouth plug 14 is formed, and the containing portion 11c of the bag 11 is filled with the infusion solution. Subsequently, the lid member 13 is placed so as to cover the mouth portion 12 , and the contact surface between the lid member 13 and the mouth portion 12 is heat-sealed to form the first seal portion 16 . In this way, the sealed infusion container 10 containing the infusion can be obtained. After the infusion container 10 is manufactured, the infusion can be injected from the mouth portion 12 with an injection needle or the like, if necessary.

Advantages of the infusion container 10 according to the present embodiment will be described below.

In the present embodiment, the layered body 30 constituting the cover member 13 of the infusion container 10 includes the first base material 41 mainly composed of PBT, so that the following effects can be obtained.
First, PBT is excellent in printability. Therefore, as in the case of polyethylene terephthalate (hereinafter also referred to as PET), a printed layer can be provided on the first base material 41 containing PBT.
Moreover, PBT is excellent in heat resistance. Therefore, deformation of the first base material 41 and reduction in strength of the first base material 41 can be suppressed when the infusion container 10 is subjected to retort treatment, boiling treatment, or the like.
PBT also has high strength. Therefore, as in the case where the laminate contains nylon, the puncture strength of the laminate 30 and the lid member 13 composed of the laminate 30 can be increased. The puncture strength of the laminate 30 is preferably 13N or higher, more preferably 15N or higher, and even more preferably 17N or higher. A method for measuring the puncture strength will be described in Example 1 below.
In addition, PBT has the characteristic of being less likely to absorb moisture than nylon. Therefore, even when the first base material 41 containing PBT is arranged on the outer surface 30y of the laminate 30, the first base material 41 absorbs moisture and the laminate strength of the laminate 30 is reduced. can be suppressed.

Moreover, the heat resistance of the laminated body 30 can be improved as compared with the case where the second base material 51 is made of PBT. As a result, for example, it is possible to suppress deterioration in performance of the lid member 13 due to damage to the lid member 13 when the infusion container 10 is heated.

Further, according to the present embodiment, the sealant layer 61 of the laminate 30 forming the lid member 13 contains the propylene/ethylene block copolymer. Therefore, the impact resistance and stab resistance of the lid member 13 can be enhanced.

Various modifications can be made to the above-described embodiment. Modifications will be described below with reference to the drawings as necessary. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding portions in the above-described embodiment are used for the portions that can be configured in the same manner as in the above-described embodiment, Duplicate explanations are omitted. Further, when it is clear that the effects obtained in the above-described embodiment can also be obtained in the modified example, the explanation thereof may be omitted.

(Modified example of layer structure)
In the above-described embodiment, the first base material 41 contains 51% by mass or more of PBT, and the second base material 51 contains 51% by mass or more of PET, so that the laminate 30 has piercing resistance and heat resistance. An example of increasing However, it is not limited to this, and the first substrate 41 contains 51% by mass or more of PET, and the second substrate 51 contains 51% by mass or more of PBT. You can increase your sexuality. As the PBT of the second base material 51, the PBT according to the first configuration or the PBT according to the second configuration described above for the first base material 41 can be used.

The fact that the second base material 51 contains 51% by mass or more of PBT and the first base material 41 contains 51% by mass or more of PET also contributes to improving the dimensional stability and printability of the laminate 30 .

In addition, since the second base material 51 contains PBT, the same effects as when the second base material 51 contains PET can be obtained. In other words, by forming the second base material 51 from PBT, it is possible to reduce the risk of elution of caprolactam or the like from the cover member 13 into the infusion container 10 .

Also, both the first base material 41 and the second base material 51 may contain 51% by mass or more of PBT. As the PBT in this case, the PBT according to the first configuration or the PBT according to the second configuration described above for the first base material 41 can be used.

Table 1 summarizes examples of combinations of materials constituting the first base material 41 and the second base material 51 . In Table 1, the notation "PBT" means that the resin constituting the film of the first substrate 41 or the second substrate 51 contains 51% by mass or more of PBT. In Table 1, the notation "PET" means that the resin constituting the film of the first substrate 41 or the second substrate 51 contains 51% by mass or more of PET.

When it is possible to select whether the first base material 41 contains PET or PBT, the first base material 41 preferably contains PET from the viewpoint of heat sealability. PET has a relatively higher melting point than PBT. Therefore, the heat resistance of the first base material 41 is further improved by including PET in the first base material 41, which is the base material positioned closer to the outer surface 30y of the lid member 13. As shown in FIG. As described above, when the first seal portion 16 is formed by heat sealing, heat sealing can be performed at a higher temperature.

(Laminate according to the second embodiment)
Next, the laminate 30 in the second embodiment will be explained. The laminate 30 according to the third embodiment differs only in that it further includes a barrier layer 80 provided on at least one of the first base material 41 and the second base material 51, and the other configuration is , is substantially the same as the laminate 30 according to the above-described first embodiment shown in FIG. In the laminate 30 according to the second embodiment, the same parts as those in the laminate 30 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Further, if it is clear that the effects obtained in the first embodiment can also be obtained in the second embodiment, the explanation thereof may be omitted.

FIG. 6 is a cross-sectional view showing an example of the laminate 30 in the second embodiment. In the example shown in FIG. 6, the laminate 30 includes a barrier layer 80 provided on the surface of the first base material 41 on the inner surface 30x side. FIG. 7 is a cross-sectional view showing another example of the laminate 30 forming the lid member 13 in the second embodiment. In the example shown in FIG. 7, the laminate 30 includes a barrier layer 80 provided on the surface of the second base material 51 on the outer surface 30y side. Therefore, the laminate 30 according to the third embodiment has, from the outer surface side to the inner surface side, first base material/barrier layer/first adhesive layer/second base material/second adhesive layer/sealant layer,
or,
It can be said to have a first substrate/first adhesive layer/barrier layer/second substrate/second adhesive layer/sealant layer. Note that "/" represents a boundary between layers. Although not shown, the printing layer described above may be provided between the barrier layer 80 and the first adhesive layer 45 .

[Barrier layer]
The barrier layer 80 will be described below.

[Transparent deposition layer]
As shown in FIGS. 6 and 7, the barrier layer 80 includes at least a transparent deposition layer 81. As shown in FIGS. The transparent deposition layer 81 is provided on the first base material 41 as shown in FIG. 6, or is provided on the second base material 51 as shown in FIG. The transparent deposited layer 81 is a deposited layer that can be formed by a conventionally known method. By providing the transparent vapor deposition layer 81, it is possible to impart or improve gas barrier properties that prevent permeation of oxygen gas, water vapor, and the like. In addition, the barrier layer 80 may include two or more layers of the transparent deposition layer 81 . When the barrier layer 80 is provided with two or more layers of the transparent deposition layer 81, each may have the same composition or may have a different composition.

The transparent deposited layer 81 is composed of a deposited layer of inorganic oxide. As the transparent deposited layer 81, for example, silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), titanium Vapor deposited layers of oxides such as (Ti), lead (Pb), zirconium (Zr), yttrium (Y) can be used. In particular, it is preferred to have a vapor-deposited layer of aluminum oxide or silicon oxide.

Inorganic oxides are represented by MO _X such as SiO _X and AlO _X (wherein M represents an inorganic element, and the value of X varies depending on the inorganic element). expressed. The range of values of X is 0 to 2 for silicon (Si), 0 to 1.5 for aluminum (Al), 0 to 1 for magnesium (Mg), 0 to 1 for calcium (Ca), Potassium (K) is 0 to 0.5, Tin (Sn) is 0 to 2, Sodium (Na) is 0 to 0.5, Boron (B) is 0 to 1.5, Titanium (Ti) can range from 0 to 2, lead (Pb) from 0 to 2, zirconium (Zr) from 0 to 2, and yttrium (Y) from 0 to 1.5. In the above, when X=0, it is a completely inorganic substance (pure substance) and not transparent, and the upper limit of the range of X is the fully oxidized value. Silicon (Si) and aluminum (Al) are preferably used for packaging materials, with silicon (Si) in the range of 1.0 to 2.0 and aluminum (Al) in the range of 0.5 to 1.5. values can be used.

The transparent deposited layer 81 may be a layer made of a mixture of inorganic compounds containing covalent bonds between aluminum atoms and carbon atoms.

When the transparent vapor deposition layer 81 is a layer made of a mixture of inorganic compounds containing covalent bonds between aluminum atoms and carbon atoms, the transparent vapor deposition layer 81 is measured by an X-ray photoelectron spectrometer (measurement conditions: X-ray source AlKα, X-ray Using an output of 120 W), the peak measured by ion etching in the depth direction shows the presence of a covalent bond between an aluminum atom and a carbon atom. You may

A covalent bond between a metal atom and a carbon atom may be formed at the interface between the transparent deposition layer 81 and the first base material 41 or the second base material 51 . For example, when the transparent vapor deposition layer 81 contains aluminum oxide, covalent bonds between aluminum atoms and carbon atoms are formed at the interface between the first base material 41 or the second base material 51 and the transparent vapor deposition layer 81. can do. A covalent bond can be detected by measurement by X-ray photoelectron spectroscopy (hereinafter abbreviated as “XPS measurement”).

In the transparent vapor deposition layer 81, the existence ratio of covalent bonds between aluminum atoms and carbon atoms is less than the carbon atoms observed when the interface with the first base material 41 or the second base material 51 is measured by XPS measurement. It is preferably within the range of 0.3% or more and 30% or less of the total bonds including. As a result, the adhesiveness between the transparent vapor deposition layer 81 and the first base material 41 or the second base material 51 is strengthened, the transparency is excellent, and a gas barrier vapor deposition film with well-balanced performance is obtained.

If the abundance ratio of covalent bonds between aluminum atoms and carbon atoms is less than 0.3%, the adhesion of the transparent deposited layer 81 is insufficiently improved, making it difficult to stably maintain barrier properties.

Furthermore, the AL (aluminum)/O (oxygen) ratio of the transparent vapor deposition layer 81 containing aluminum oxide as a main component is the first It is preferably 1.0 or less within a range of up to 3 nm toward the surface of the transparent deposition layer 81 opposite to the base material 41 or the second base material 51 .
AL/O within a range from the interface between the transparent vapor deposition layer 81 and the first base material 41 or the second base material 51 toward the surface of the transparent vapor deposition layer 81 opposite to the first base material 41 or the second base material 51 exceeds 1.0, the adhesion between the transparent vapor deposition layer 81 side of the first base material 41 or the second base material 51 and the transparent vapor deposition layer 81 becomes insufficient, and the proportion of aluminum increases. The transparency of the transparent deposition layer 81 is lowered.

The layer thickness of the transparent deposited layer 81 varies depending on the type of inorganic oxide used, etc., but it is desirable to select and form it arbitrarily within the range of, for example, 50 Å or more and 2000 Å or less, preferably 100 Å or more and 1000 Å or less. . For example, in the case of a deposited layer of aluminum oxide or silicon oxide, the layer thickness is preferably 50 Å or more and 500 Å or less, more preferably 100 Å or more and 300 Å or less.

The transparent deposition layer 81 can be formed on the first base material 41 or the second base material 51 using the following forming method. Examples of methods for forming the vapor deposition layer include physical vapor deposition methods such as vacuum deposition, sputtering, and ion plating (Physical Vapor Deposition, PVD), plasma chemical vapor deposition, thermochemical A chemical vapor deposition method (Chemical Vapor Deposition method, CVD method) such as a chemical vapor deposition method and a photochemical vapor deposition method can be used. Specifically, a vapor deposition layer can be formed on a film forming roller using a roller type vapor deposition film forming apparatus.

In particular, when forming a covalent bond between a metal atom and a carbon atom at the interface between the transparent vapor deposition layer 81 and the first base material 41 or the second base material 51, the first A surface of the base material 41 or the second base material 51 is pretreated. The pretreatment can be performed by supplying plasma to the surface of the first base material 41 or the second base material 51 under a reduced pressure environment of 0.1 Pa or more and 100 Pa or less using a pretreatment device. Plasma is generated by using an inert gas such as argon alone or a mixed gas of oxygen, nitrogen, carbon dioxide, and one or more of these gases as a plasma raw material gas, and the plasma raw material gas is excited by a potential difference due to a high frequency voltage or the like. can be generated by

The pretreatment can confine plasma near the surface of the first substrate 41 or the second substrate 51 . This makes it possible to change the shape of the surface of the base material, the state of chemical bonding, and the functional groups, thereby changing the chemical properties of the surface of the base material. This makes it possible to improve the adhesion between the first base material 41 or the second base material 51 and the transparent vapor deposition layer 81 when forming the vapor deposition layer.

[Gas barrier coating film]
The barrier layer 80 may further include a gas barrier coating film 82 . The gas barrier coating film 82 is provided on the surface of the transparent deposition layer 81 described above. The gas barrier coating film 82 is a coating film that functions as a layer that suppresses permeation of oxygen gas and water vapor. The gas barrier coating film 82 has the general formula R ¹ _n M (OR ² ) _m (wherein R ¹ and R ² represent an organic group having 1 to 8 carbon atoms, M represents a metal atom, n represents an integer of 0 or more, m represents an integer of 1 or more, and n+m represents the valence of M.) and at least one or more alkoxides represented by ), a polyvinyl alcohol-based resin and / or an ethylene-vinyl alcohol copolymer, and is obtained by polycondensation by the sol-gel method in the presence of a sol-gel catalyst, acid, water and an organic solvent.

As the alkoxide represented by the general formula R ¹ _n M(OR ² ) _m , at least one of partial hydrolyzate of alkoxide and condensate of hydrolysis of alkoxide can be used. The partial hydrolyzate of the above alkoxide does not need to have all of the alkoxy groups hydrolyzed, and may be those in which one or more alkoxy groups are hydrolyzed, or a mixture thereof. As the condensate obtained by hydrolysis of alkoxide, dimers or higher of partially hydrolyzed alkoxides, specifically dimers to hexamers, are used.

In the alkoxide represented by the general formula R ¹ _n M(OR ² ) _m , the metal atom represented by M can be silicon, zirconium, titanium, aluminum, or the like. In this embodiment, preferred metals include, for example, silicon and titanium. In the present invention, alkoxides can be used either singly or as a mixture of alkoxides of two or more different metal atoms in the same solution.

Further, in the alkoxide represented by the general formula R ¹ _n M(OR ² ) _m , specific examples of the organic group represented by R ¹ include a methyl group, an ethyl group, an n-propyl group, i -propyl group, n-butyl group, i-butyl group, sec-butyl group, t-butyl group, n-hexyl group, n-octyl group, and the like. Further, in the alkoxide represented by the general formula R ¹ _n M(OR ² ) _m , specific examples of the organic group represented by R ² include a methyl group, an ethyl group, an n-propyl group, i -propyl group, n-butyl group, sec-butyl group, and the like. These alkyl groups may be the same or different in the same molecule.

For example, a silane coupling agent may be added when preparing the gas barrier composition. Known organic reactive group-containing organoalkoxysilanes can be used as the silane coupling agent. In the present embodiment, organoalkoxysilanes having an epoxy group are particularly preferably used, and specific examples include γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane and the like can be used. The above silane coupling agents may be used singly or in combination of two or more.

(Effect of this embodiment)
In the present embodiment, laminate 30 includes barrier layer 80 provided on at least one of first base material 41 and second base material 51 . Therefore, it is possible to improve the gas barrier properties of the lid member 13 composed of the laminate 30 .

In this embodiment, an example of using the laminate 30 as the cover member 13 of the infusion container 10 is shown, but the application of the laminate 30 is not limited to this. For example, the layered body 30 can be used as a lid material for a container containing food, medicine, or the like that is ingested by a person. Specific examples of the contents include jelly, pudding, side dishes, boiled rice, and the like.

(Other aspects)
Another aspect of the invention is
A laminate comprising at least a first base material, a second base material and an easy-peel sealant layer in this order, wherein the second base material contains 51% by mass or more of polyethylene terephthalate or 51% by mass or more of When polybutylene terephthalate is included and the second substrate includes 51% by mass or more of polyethylene terephthalate, the first substrate is a laminate including 51% by mass or more of polybutylene terephthalate.

In a laminate according to another aspect of the present invention, the laminate may have a puncture strength of 13 N or more.

In the laminate according to another aspect of the present invention, the base material containing 51% by mass or more of polybutylene terephthalate among the first base material and the second base material has a multilayer structure part including 10 or more layers. good too.

In the laminate according to another aspect of the present invention, the substrate containing 51% by mass or more of polybutylene terephthalate in the first substrate and the second substrate has a It may consist of a single layer structure with the following IV values:

In a laminate according to another aspect of the present invention, the first substrate may contain 51% by mass or more of polybutylene terephthalate, and the second substrate may contain 51% by mass or more of polyethylene terephthalate.

In a laminate according to another aspect of the present invention, the first substrate may contain 51% by mass or more of polyethylene terephthalate, and the second substrate may contain 51% by mass or more of polybutylene terephthalate.

A laminate according to another aspect of the present invention may further include a printed layer located between the first substrate and the second substrate.

In the laminate according to another aspect of the present invention, the sealant layer may contain polyethylene and polypropylene.

In the laminate according to another aspect of the present invention, a transparent layer provided on at least one of the first base material and the second base material between the first base material and the second base material A barrier layer including at least a vapor deposition layer may be further provided.

In the laminate according to another aspect of the present invention, the transparent vapor deposition layer contains aluminum oxide, and at least one of the first substrate and the second substrate provided with the transparent vapor deposition layer; A covalent bond between an aluminum atom and a carbon atom may be formed at the interface with the transparent deposition layer.

A further aspect of the present invention is an infusion container, comprising: a bag; a resin-containing mouth portion provided in the bag; The laminate includes at least a first base material, a second base material, and an easy-peel sealant layer in this order from the mouth side to the side opposite to the mouth part, and the second base material is 51% by mass or more of polyethylene terephthalate or 51% by mass or more of polybutylene terephthalate, and when the second substrate contains 51% by mass or more of polyethylene terephthalate, the first substrate contains 51% by mass or more of polybutylene An infusion container containing terephthalate.

In a shipping container according to a further aspect of the invention, the laminate may further comprise a printed layer positioned between the first substrate and the second substrate.

The transport container according to a further aspect of the present invention further comprises a first sealing portion that joins the mouth portion and the lid member, wherein the sealing strength of the first sealing portion at 23° C. is 20 N/15 mm or less. may

EXAMPLES Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the description of the Examples below as long as it does not exceed the gist thereof.

(Example 1)
A film-like first substrate 41 including a plurality of layers 41a and produced by a casting method, which was described in the above-described first configuration, was prepared. The content of PBT in each layer 41a was 80%, the number of layers 41a was 1024, and the thickness of the first substrate 41 was 15 μm. Subsequently, a printed layer was formed on the film-like first base material 41 using Finart manufactured by DIC Graphics Corporation.

Also, a film-like second film 50 including a second substrate 51 was prepared. As the second base material 51, one containing 100% by mass of PET was used. The thickness of the second base material 51 was 12 μm.

Also, a film-like third film 60 including a sealant layer 61 was prepared. As the sealant layer 61, TAF680C manufactured by Mitsui Chemicals Tohcello was used. The thickness of the sealant layer 61 was 50 μm.

Next, the first film 40 and the second film 50 were laminated by a dry lamination method with the first adhesive layer 45 interposed therebetween. As the first adhesive layer 45, a two-liquid type polyurethane adhesive (main agent: RU-40, curing agent: H-4) manufactured by Rock Paint Co., Ltd. was used. RU-40 contains a polyester polyol. H-4 contains an aliphatic isocyanate compound. The thickness of the first adhesive layer 45 was 3 μm.

Next, the laminate of the first film 40 and the second film 50 and the third film 60 were laminated by a dry lamination method to obtain the laminate 30 . As the second adhesive layer 55, similarly to the first adhesive layer 45, a two-liquid type polyurethane adhesive (main agent: RU-40, curing agent: H-4) manufactured by Rock Paint Co., Ltd. was used. The thickness of the second adhesive layer 55 was 3 μm.

Subsequently, the puncture strength of the laminate 30 was measured according to JIS Z1707 7.4. As a measuring instrument, a Tensilon universal material testing machine RTC-1310 manufactured by A&D was used. Specifically, as shown in FIG. 8, a semicircular needle 70 having a diameter of 1.0 mm and a tip shape radius of 0.5 mm is applied from the outer surface 30y side to the test piece of the laminated body 30 in a fixed state. was pierced at a speed of 50 mm/min (50 mm per minute), and the maximum value of stress until the needle 70 penetrated the laminate 30 was measured. The maximum value of stress was measured for five or more test pieces, and the average value was defined as the puncture strength of the laminate 30 . The environment during the measurement was a temperature of 23° C. and a relative humidity of 50%. As a result, the puncture strength was 15N.

(Example 2)
The first base material 41 of the first film 40 contains 100% by mass of PBT described in the above second configuration, and the PBT has a melting point of 224 ° C. and an IV value of 1.26 dl / g. A laminate 30 was produced in the same manner as in Example 1, except that a single-layer film produced by the method was used. The first base material 41 was a single-layer film composed only of PBT and additives, and the thickness of the first base material 41 was 15 μm.

Subsequently, in the same manner as in Example 1, the puncture strength of the laminate 30 was measured. As a result, the puncture strength was 16N.

(Example 3)
Example except that PBT constituting the first base material 41 of Example 1 was used as the second base material 51, and PET constituting the second base material 51 of Example 1 was used as the first base material 41. A laminate 30 was produced in the same manner as in case 1.

Subsequently, in the same manner as in Example 1, the puncture strength of the laminate 30 was measured. As a result, the puncture strength was 15N.

(Example 4)
Example 2 except that PBT constituting the first base material 41 of Example 2 was used as the second base material 51, and PET constituting the second base material 51 of Example 2 was used as the first base material 41. A laminate 30 was produced in the same manner as in case 1.

Subsequently, in the same manner as in Example 1, the puncture strength of the laminate 30 was measured. As a result, the puncture strength was 16N.

(Comparative example 1)
A laminate 30 was produced in the same manner as in Example 1, except that a base material containing 100% by mass of PET was used as the first base material 41 of the first film 40 . The thickness of the first base material 41 was 12 μm.

Subsequently, in the same manner as in Example 1, the puncture strength of the laminate 30 was measured. As a result, the puncture strength was 11N.

(Comparative example 2)
A laminate 30 was produced in the same manner as in Comparative Example 1, except that a 15 μm-thick nylon film (Bonyl W manufactured by Kojin Holdings Co., Ltd.) was used as the second base material 51 of the second film 50. .

Subsequently, in the same manner as in Example 1, the puncture strength of the laminate 30 was measured. As a result, the puncture strength was 16N.

The layer structures and evaluation results of the laminates of Examples 1 to 4 and Comparative Examples 1 and 2 are collectively shown in FIG. In FIG. 9, in the column of "Layer Configuration", the constituent elements of the laminate excluding the adhesive layer are described from the top in order from the layer on the outer surface side. As can be seen from the comparison between Examples 1 to 4 and Comparative Examples 1 and 2, when the first base material 41 or the second base material 51 contains PBT, both the first base material 41 and the second base material 51 are The puncture strength was higher than when PET was included, and was about the same as when the second base material included nylon.

10 Infusion container 11 Bag 11a Film 11b Second seal portion 11c Storage portion 12 Mouth portion 13 Lid member 14 Mouth stopper 14a Tube portion 15 Third seal portion 16 First seal portion 27 Unsealable portion 30 Laminate 40 First film 41 First substrate 41a Layer 45 First adhesive layer 50 Second film 51 Second substrate 55 Second adhesive layer 60 Third film 61 Sealant layer 80 Barrier layer 81 Transparent deposition layer 82 Gas barrier coating film 90 Test piece 91 First side 92 Second side 93 Third side 94 Fourth side

Claims (12)

An infusion container,
a bag;
a mouth portion containing a resin provided in the bag;
provided in the mouth,producta lid material including a layered body,
The laminate includes at least a first base material, a second base material, and an easy-peel sealant layer in this order from the opening side to the side opposite to the opening.,
The second base material contains 51% by mass or more of polyethylene terephthalate or 51% by mass or more of polybutylene terephthalate,
When the second substrate contains 51% by mass or more of polyethylene terephthalate, the first substrate contains 51% by mass or more of polybutylene terephthalate,
The substrate containing 51% by mass or more of polybutylene terephthalate among the first substrate and the second substrate has a single layer structure having an IV value of 1.10 dl/g or more and 1.35 dl/g or less. is a stretched film, Infusion container. 2. The infusion container according to claim 1, wherein the base material of the first base material and the second base material containing 51% by mass or more of polybutylene terephthalate also contains polyethylene terephthalate. 3. The infusion container according to claim 2, wherein the content of polyethylene terephthalate in the substrate containing 51% by mass or more of polybutylene terephthalate among the first substrate and the second substrate is 30% by mass or less. The infusion solution container according to any one of claims 1 to 3, wherein the laminate has a puncture strength of 13 N or more. The first substrate contains 51% by mass or more of polybutylene terephthalate,
5. The infusion container according to any one of claims 1 to 4, wherein the second base material contains 51% by mass or more of polyethylene terephthalate. The first base material contains 51% by mass or more of polyethylene terephthalate,
5. The infusion container according to any one of claims 1 to 4, wherein the second base material contains 51% by mass or more of polybutylene terephthalate. The laminate is 7. Any one of claims 1-6, further comprising a printed layer located between the first substrate and the second substrate.infusion container. 8. The infusion container according to any one of claims 1-7, wherein the sealant layer comprises polyethylene and polypropylene. The laminate is Further comprising a barrier layer including at least a transparent deposition layer provided on at least one of the first substrate and the second substrate between the first substrate and the second substrate, According to any one of claims 1 to 8infusion container. wherein the transparent deposition layer contains aluminum oxide,
A covalent bond between an aluminum atom and a carbon atom is formed at an interface between at least one of the first base material and the second base material provided with the transparent vapor deposition layer and the transparent vapor deposition layer. 10. The infusion container according to claim 9. The infusion container according to claim 9 or 10, wherein the barrier layer further comprises a gas barrier coating film provided on the surface of the transparent deposition layer. further comprising a first sealing portion that joins the mouth portion and the lid member;
The infusion solution container according to any one of claims 1 to 11, wherein the sealing strength of the first seal portion at 23°C is 20 N/15 mm or less.

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