JP2014176998A - Biaxially-oriented nylon coating film, laminated packaging material, and molding - Google Patents

Abstract

The present invention provides a biaxially stretched nylon coating film, a laminate packaging material, and a molded body, which are excellent in chemical resistance such as acid resistance and have excellent deep drawability during cold forming.
A biaxially stretched nylon coating film in which a coating layer is provided on a biaxially stretched nylon film 3 made from a nylon resin, and the biaxially stretched nylon film has a plane orientation degree (P) of the following formula: P = (Nx + Ny) /2−Nz≧0.042 (F1) The coating layer is made of polyvinylidene chloride, vinylidene chloride-vinyl chloride copolymer. A biaxially stretched nylon coating film comprising at least one selected from the group consisting of maleic anhydride-modified polypropylene, polyester resin, epoxy resin, phenolic resin, fluororesin, cellulose ester, urethane resin, and acrylic resin .
[Selection] Figure 1

Description

  In particular, the present invention relates to a biaxially stretched nylon coating film, a laminate packaging material, and a molded body that can be suitably used as a packaging material for cold molding that requires chemical resistance such as acid resistance.

In recent years, as a packaging material for a lithium battery, demand for a laminate packaging material is increasing from the viewpoint of thinning, safety, flexibility in shape, and weight reduction.
Here, in a laminate packaging material used as a packaging material for a lithium battery, it is known that a biaxially stretched nylon film is used as a surface base material from the viewpoint of moldability and pinhole resistance. On the other hand, the nylon film may be dissolved by the strong acidity (hydrogen fluoride (HF) or the like) of the contents. Thus, from the viewpoint of safety and productivity (yield), it is common to laminate an acid resistant layer such as a polyethylene terephthalate (PET) film on the outer layer of the nylon film.
As a method for producing a laminate packaging material for laminating such an acid-resistant layer, it has been proposed to laminate a polyester layer such as a polyethylene terephthalate (PET) film on a nylon film via an adhesive layer (for example, Patent Documents). 1).

International Publication No. 2010/047354

  On the other hand, the packaging material for cold molding is required to further improve the drawability (deep drawability) as the capacity of batteries and the like increases. However, in a laminate packaging material including a biaxially stretched nylon film as described in Patent Document 1, there is no problem in ordinary drawing, but if deep drawing is performed, pinholes may be generated.

In addition, in a battery used for a hybrid vehicle, a PHV, an electric vehicle (EV), and the like, several tens to several hundreds of battery cells are arranged in series. In this way, when a large number of battery cells are arranged in series, even if one piece leaks, and the nylon layer on the surface of the other battery cell is melted, the functionality of the entire battery is reduced. There is a risk that the production yield may be poor. Therefore, chemical resistance such as acid resistance under deeper conditions and deep drawability are required.
Accordingly, an object of the present invention is to provide a biaxially stretched nylon coating film, a laminate wrapping material and a molded body which are excellent in chemical resistance such as acid resistance and have excellent deep drawability at the time of cold molding.

  In the present invention, cold molding refers to molding performed at room temperature without heating. One means of such cold forming is to use a cold forming machine used for forming aluminum foil or the like to push the sheet material into the female mold with a male mold and press it at high speed. According to such cold forming, plastic deformation such as molding, bending, shearing and drawing can be generated without heating.

As a result of intensive studies to solve the above problems, the present inventor has a correlation between the molecular orientation of the film and the drawability, and can improve the drawability of the film by using a predetermined molecular orientation. In addition, it has been found that when a predetermined coating layer is provided on a film having a predetermined molecular orientation, both chemical resistance such as acid resistance and drawability can be achieved. The present invention has been completed based on such findings, and provides the following biaxially stretched nylon coating film, laminate packaging material and molded article.
That is, the biaxially stretched nylon coating film of the present invention is a biaxially stretched nylon coating film in which a coating layer is provided on a biaxially stretched nylon film made from a nylon resin, Of the three-dimensional refractive index of the film, the maximum refractive index value in the film plane is Nx, the minimum refractive index value in the film plane is Ny, and the refractive index value in the thickness direction of the film is Nz. The surface orientation degree (P) satisfies the condition represented by the following mathematical formula (F1),
P = (Nx + Ny) /2−Nz≧0.042 (F1)
The coating layer is selected from the group consisting of polyvinylidene chloride, vinylidene chloride-vinyl chloride copolymer, maleic anhydride-modified polypropylene, polyester resin, epoxy resin, phenol resin, fluorine resin, cellulose ester, urethane resin, and acrylic resin. It is characterized by comprising at least one kind.

In the biaxially stretched nylon coating film of the present invention, the thickness of the coating layer is preferably 0.5 μm or more.
In the biaxially stretched nylon coating film of the present invention, the coating layer is preferably a layer formed by a solvent coating method.
In the biaxially stretched nylon coating film of the present invention, the coating layer is preferably made of at least one selected from the group consisting of polyvinylidene chloride and a polyester resin.

The laminate packaging material of the present invention is characterized in that the biaxially stretched nylon coating film and a sealant film are laminated.
The molded body of the present invention is characterized by being cold-molded using the laminate packaging material.

  ADVANTAGE OF THE INVENTION According to this invention, it is excellent in chemical resistance, such as acid resistance, and can provide the biaxially-stretched nylon coating film, laminate packaging material, and molded object which have the deep drawing moldability excellent at the time of cold forming.

It is a schematic block diagram which shows an example of the apparatus which manufactures the biaxially stretched nylon film in this invention.

Hereinafter, the present invention will be described in detail with reference to preferred embodiments thereof.
[Configuration of biaxially stretched nylon film]
The biaxially stretched nylon film (ONy film) of this embodiment is formed by biaxially stretching a raw film made of nylon resin as a raw material and heat-fixing it at a predetermined temperature.
Nylon 6, nylon 8, nylon 11, nylon 12, nylon 6,6, nylon 6,10, nylon 6,12, etc. can be used as the nylon resin as the raw material. Nylon 6 (hereinafter also referred to as Ny6) is preferably used from the viewpoint of physical properties, melting characteristics, and ease of handling.
Here, the chemical formula of Ny6 is shown in the following formula (1).

  The number average molecular weight of the raw material nylon resin is preferably 15000 or more and 30000 or less, and more preferably 22000 or more and 24000 or less.

In this embodiment, among the three-dimensional refractive indexes of the ONy film, the maximum refractive index value in the ONy film surface is Nx, the minimum refractive index value in the ONy film surface is Ny, and the refractive index in the thickness direction of the ONy film is When the value is Nz, it is necessary that the degree of plane orientation (P) satisfies the condition represented by the following formula (F1).
P = (Nx + Ny) /2−Nz≧0.042 (F1)
When the degree of plane orientation (P) is less than 0.042, the deep drawability of the resulting film is insufficient.
Here, each component Nx, Ny, and Nz of the three-dimensional refractive index was obtained by measuring the refractive index of the film tilted by 0 ° and 45 ° using RETS-100 manufactured by Otsuka Electronics Co., Ltd. It can be calculated by analyzing the results. The three-dimensional refractive index is a value at a measurement wavelength of 589 nm.

  In addition, as a means which makes the characteristic (plane orientation degree (P)) of an ONy film the range mentioned above, adjusting the draw ratio at the time of ONy film manufacture, a draw temperature, a draw speed, and the heat setting temperature after extending | stretching is mentioned. It is done. In addition, examples of the stretching method of the ONy film include a tenter simultaneous biaxial stretching method, a tenter sequential biaxial stretching method, and a tubular simultaneous biaxial stretching method. In particular, the characteristics of the ONy film are described above. In order to make it into a range, it is preferable to use a tubular simultaneous biaxial stretching method.

[Configuration of biaxially stretched nylon coating film]
The biaxially stretched nylon coating film of this embodiment is a film in which a coating layer described below is provided on an ONy film.
Examples of the resin constituting the coating layer include polyvinylidene chloride, vinylidene chloride-vinyl chloride copolymer, maleic anhydride-modified polypropylene, polyester resin, epoxy resin, phenol resin, fluorine resin, cellulose ester, urethane resin, and An acrylic resin is mentioned. Among these, from the viewpoint of acid resistance, polyvinylidene chloride and polyester resin are more preferable, and polyvinylidene chloride is particularly preferable.
Examples of the method for forming the coating layer include (i) a method of coating a solution in which a resin is dissolved in a solvent (solvent coating method), and (ii) a dispersion liquid in which a resin is dispersed in a dispersion medium (for example, a suspension). A method of coating a turbid liquid) can be employed. Among these, it is preferable to employ the solvent coating method (i) from the viewpoint that defects are hardly generated in the coating layer.

  The thickness of the coating layer is preferably 0.5 μm or more, and more preferably 0.6 μm or more. When the thickness is less than the lower limit, the effect of improving chemical resistance such as acid resistance tends to be insufficient. The upper limit of the thickness is not particularly limited, but if it exceeds 5 μm, it becomes difficult to obtain an effect of improving chemical resistance such as acid resistance, and it takes time to form a coating layer, which only increases the cost. It is not preferable.

[Composition of laminate packaging material]
The laminate packaging material of this embodiment is composed of one or two or more other laminate substrates (at least a sealant film) on at least the surface opposite to the coating layer of the biaxially stretched nylon coating film (coat / ONy). Inclusive). Specifically, examples of the other laminate substrate include a polyethylene terephthalate (PET) layer, an aluminum layer, a film containing an aluminum layer, a polypropylene-based or polyethylene-based seal layer (sealant film), and the like.
Further, the laminate packaging material of the present embodiment may be obtained by further laminating a coating layer such as a lubricant or an antistatic agent on at least one surface of the biaxially stretched nylon coating film.
By further laminating such a laminate base material and coating layer, it is possible to improve production efficiency and conveyance efficiency, as well as functionality (chemical resistance such as acid resistance, electrical insulation, moisture resistance) , Cold resistance, workability, etc.) can be obtained.
Examples of the lamination mode of the laminate film include coat / ONy / Al / PP.

  In general, a laminate packaging material including an aluminum layer is not suitable for cold forming because the aluminum layer easily breaks due to necking during cold forming. In this respect, according to the laminate packaging material of the present embodiment, the above-described ONy film has excellent drawability, so that it is possible to suppress the breakage of the aluminum layer during cold deep drawing, etc. The generation of pinholes in can be suppressed. Therefore, even when the total thickness of the packaging material is thin, a molded product having a sharp shape and high strength can be obtained.

  The laminate packaging material of this embodiment preferably has an overall thickness of the ONy film and other laminate base material of 200 μm or less. When the total thickness exceeds 200 μm, it becomes difficult to form the corner portion by cold forming, and it tends to be difficult to obtain a molded product having a sharp shape.

  The thickness of the ONy film in the laminate packaging material of this embodiment is preferably 5 μm or more and 50 μm or less, and more preferably 10 μm or more and 30 μm or less. Here, if the thickness of the ONy film is less than 5 μm, the impact resistance of the laminate packaging material tends to be low, and the cold formability tends to be insufficient. On the other hand, when the thickness of the ONy film exceeds 50 μm, it is difficult to obtain an effect of further improving the impact resistance of the laminate packaging material, which is not preferable because the total thickness of the packaging material is increased.

[Configuration of molded body]
The molded body of this embodiment is characterized by being cold-molded using the laminate packaging material. This molded body is excellent in chemical resistance such as acid resistance, and uses the laminate packaging material having excellent deep drawability at the time of cold molding, so it is used for hybrid vehicles, PHVs, electric vehicles (EV), and the like. It can use especially suitably as a molded object for lithium batteries.

[Production equipment for biaxially stretched nylon film]
Next, a method for producing the biaxially stretched nylon film of the present embodiment will be described based on the drawings.
First, an apparatus for producing the biaxially stretched nylon film of this embodiment will be described with an example.
As shown in FIG. 1, the film manufacturing apparatus 100 includes an original fabric manufacturing apparatus 90 for manufacturing the original fabric film 1, a biaxial stretching apparatus (tubular stretching apparatus) 10 that stretches the original fabric film 1, and stretching. A first heat treatment device 20 (preheating furnace) that preheats a base film 2 that is folded later (hereinafter also simply referred to as “film 2”), a separation device 30 that separates the preheated film 2 into two upper and lower sheets, A second heat treatment device 40 that heat-treats (heat-set) the separated film 2, a tension control device 50 that applies tension to the film 2 from the downstream side when the film 2 is heat-set, and the film 2 is heat-set. And a winding device 60 for winding the biaxially stretched nylon film 3 (hereinafter also simply referred to as “film 3”).

As shown in FIG. 1, the raw fabric manufacturing apparatus 90 includes an extruder 91, a circular die 92, a water cooling ring 93, a stabilizer plate 94, and a pinch roll 95.
The tubular stretching device 10 is a device for producing a film 2 by biaxially stretching (bubble stretching) a tubular raw film 1 with the pressure of internal air. As shown in FIG. 1, the tubular stretching device 10 includes a pinch roll 11, a heating unit 12, a guide plate 13, and a pinch roll 14.
The first heat treatment apparatus 20 is an apparatus for preliminarily heat-treating the flat film 2. As shown in FIG. 1, the first heat treatment apparatus 20 includes a tenter 21 and a heating furnace 22.
As shown in FIG. 1, the separating device 30 includes a guide roll 31, a trimming device 32, separating rolls 33A and 33B, and grooved rolls 34A to 34C. Further, the trimming device 32 has a blade 321.

The second heat treatment apparatus 40 includes a tenter 41 and a heating furnace 42 as shown in FIG.
As shown in FIG. 1, the tension controller 50 includes guide rolls 51 </ b> A and 51 </ b> B and a tension roll 52.
As shown in FIG. 1, the winding device 60 includes a guide roll 61 and a winding roll 62.

[Production method of biaxially stretched nylon film]
Next, each process which manufactures a biaxially-stretched nylon film using this film manufacturing apparatus 100 is demonstrated in detail.

(Raw film production process)
As shown in FIG. 1, the raw material nylon resin is melt-kneaded by an extruder 91 and extruded into a tube shape by a circular die 92. The tubular molten resin is cooled by a water cooling ring 93. The raw film 1 is formed by rapidly cooling a molten nylon resin as a raw material by a water cooling ring 93. The cooled original film 1 is folded by the stabilizer 94. The folded original fabric film 1 is sent to the next biaxial stretching process by a pinch roll 95 as a flat film.

(Biaxial stretching process)
As shown in FIG. 1, the original film 1 manufactured by the original film manufacturing process is introduced into the apparatus as a flat film by a pinch roll 11. The introduced raw film 1 is bubble-stretched by being heated with infrared rays at the heating unit 12. Thereafter, the film 2 after being bubble-stretched is folded by the guide plate 13. The folded film 2 is pinched by the pinch roll 14 and sent to the next first heat treatment step as a flat film 2.

At this time, the draw ratios in the MD direction and the TD direction are each preferably 2.8 times or more. When either the MD direction or the TD direction draw ratio is less than 2.8 times, the impact strength tends to decrease, and there is a tendency for practical problems to occur.
Moreover, it is preferable that the difference (TD-MD) which subtracted the draw ratio of MD direction from the draw ratio of TD direction is 0.1 times or more, and more preferably 0.2 times or more and 0.8 times or less. Preferably, it is still more preferably 0.3 times or more and 0.8 times or less. If the value of TD-MD is less than the above lower limit, the deep drawability of the resulting film tends to be insufficient, and the thickness accuracy of the film tends to be lowered. In particular, when the value of TD-MD is 0.1 times or less, the stretching stability is inferior and the thickness accuracy of the film tends to be lowered. On the other hand, when the value of TD-MD exceeds the above upper limit, the deep drawability of the resulting film tends to be insufficient, and the stretching stability tends to decrease.

(First heat treatment process)
The film 2 sent from the biaxial stretching step is at or above the shrinkage start temperature of the film 2 and about 30 ° C. higher than the melting point of the film 2 while being gripped at both ends by clips (not shown) of the tenter 21. The film 2 is preheated at a low temperature or lower and sent to the next separation step.
The heat treatment temperature in the first heat treatment is preferably 120 ° C. or higher and 190 ° C. or lower, and the relaxation rate is preferably 15% or lower.
By this first heat treatment step, the crystallinity of the film 2 is increased, and the slipping property between the overlapping films is improved.

(Separation process)
As shown in FIG. 1, the flat film 2 sent through the guide roll 31 is cut into both ends by a blade 321 of a trimming device 32 and separated into two films 2A and 2B. And film 2A, 2B is isolate | separated, interposing air between film 2A, 2B by a pair of separation roll 33A, 33B located up and down apart. The incision of the flat film 2 may be performed so that a part of the ear is generated by positioning the blade 321 slightly inward from both ends, or by positioning the blade 321 in the fold portion of the film 2. , It may be performed so that the ear does not occur.
These films 2A and 2B are overlapped again by three grooved rolls 34A to 34C positioned in order in the film flow direction, and sent to the next second heat treatment step. In addition, these grooved rolls 34A to 34C are obtained by plating the surface after the grooved processing. A good contact state between the films 2A and 2B and the air can be obtained through the grooves.

(Second heat treatment process (heat setting process))
The overlapped films 2A and 2B are heat-treated at a temperature equal to or lower than the melting point of the resin constituting the film 2 and about 30 ° C. lower than the melting point while being gripped at both ends by clips (not shown) of the tenter 41. It is (heat-set) and becomes a biaxially stretched nylon film 3 (hereinafter also referred to as film 3) having stable physical properties, and is sent to the next winding step.
The heat treatment temperature in the second heat treatment (heat setting) is preferably 160 ° C. or higher and 215 ° C. or lower. If the heat treatment temperature is less than the lower limit, the film shrinkage rate tends to increase and the risk of delamination tends to increase.On the other hand, if the upper limit is exceeded, the bowing phenomenon at the time of heat setting increases and the distortion of the film increases. Also, the density tends to be too high, and the degree of crystallinity tends to be too high, making the film difficult to deform.
In addition, the relaxation rate at this time is preferably 15% or less.
A strong tension is applied to the films 2A and 2B in the heating furnace 42 by the tension control device 50 located on the downstream side.

(Winding process)
The film 3 heat-set in the second heat treatment step is wound as films 3A and 3B on the two winding rolls 62 via the guide roll 61 via the tension control device 50.

[Modification of Embodiment]
The aspect described above shows one aspect of the present invention, and the present invention is not limited to the above-described embodiment, and has the configuration of the present invention and can achieve the object and effect. It goes without saying that modifications and improvements within the scope are included in the content of the present invention. In addition, the specific structure and shape in carrying out the present invention may be used as other structures and shapes within the scope of achieving the object and effect of the present invention.

  For example, in this embodiment, the tubular method is adopted as the biaxial stretching method, but a tenter method may be used. Furthermore, the stretching method may be simultaneous biaxial stretching or sequential biaxial stretching.

EXAMPLES Next, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited at all by these examples. In addition, the characteristics in each example (the deep drawability and acid resistance of the biaxially stretched nylon film plane orientation laminate packaging material) were evaluated by the following methods.
(I) Degree of plane orientation Using RETS-100 manufactured by Otsuka Electronics Co., Ltd., measuring the refractive index of a biaxially stretched nylon film with a tilt of 0 ° and 45 °, and analyzing the obtained results Thus, each component Nx, Ny and Nz of the three-dimensional refractive index (measurement wavelength: 589 nm) was calculated. Further, the degree of plane orientation was calculated from these three-dimensional refractive index values.
(Ii) Deep-drawing moldability The laminate packaging material was cut to prepare a 120 × 80 mm strip piece as a sample. Using a 33 x 55 mm rectangular mold, press it with a surface pressure of 0.1 MPa, change the molding depth from 0.5 mm to 0.5 mm, and cold mold each 10 samples. (One-stage pull-in molding). Then, the molding depth at which no pinhole was generated in any of the 10 samples in the aluminum foil was defined as the critical molding depth, the molding depth was shown as an evaluation value, and evaluation was performed according to the following criteria. In addition, confirmation of the pinhole confirmed the transmitted light visually.
A: The limit molding depth is 7 mm or more.
X: The limit molding depth is less than 7 mm.
(Iii) Acid resistance Using a laminate packaging material as a sample, concentrated hydrochloric acid (20% by mass) was dropped on the surface opposite to the sealant film of the sample, and the state of the surface was visually observed every predetermined time. . And it evaluated according to the following references | standards.
(Double-circle): The film surface did not melt | dissolve.
A: The film surface was dissolved after 1 hour had passed after the dropwise addition of concentrated hydrochloric acid.
X: The film surface melt | dissolved 1 hour after concentrated hydrochloric acid was dripped.

[Example 1]
(Raw film production process)
As shown in FIG. 1, after Ny6 pellets were melt-kneaded at 270 ° C. in an extruder 91, the melt was extruded as a tubular film from a circular die 92, and then rapidly cooled with water (15 ° C.). Film 1 was produced.
What was used as Ny6 is Ube Industries, Ltd. nylon 6 [UBE nylon 1022FD (trade name), relative viscosity ηr = 3.5].
(Biaxial stretching process)
Next, as shown in FIG. 1, the raw film 1 is inserted between a pair of pinch rolls 11, and then heated by the heating unit 12 while a gas is being pressed into the film 1, and blown to the stretching start point to form bubbles. The biaxial stretching in the MD direction and the TD direction was performed by the tubular method by expanding and taking up with a pair of downstream pinch rolls 14. The magnification during this stretching was 3.0 times in the MD direction and 3.3 times in the TD direction.
(First heat treatment step and second heat treatment step)
Next, as shown in FIG. 1, the film 2 is subjected to heat treatment at a temperature of 170 ° C. by the first heat treatment device 20, and then passed through the separation device 30 and then heat treated at a temperature of 205 ° C. by the second heat treatment device 40. And heat fixed.
(Winding process)
Next, as shown in FIG. 1, the film 3 heat-set in the second heat treatment step is wound as two films 3 </ b> A and 3 </ b> B on two winding rolls 62 via a guide roll 61 via a tension control device 50. A biaxially stretched nylon film was produced. The thickness of the obtained biaxially stretched nylon film was 15 μm.
The plane orientation degree of the obtained biaxially stretched nylon film was measured. The obtained results are shown in Table 1.
(Production of biaxially stretched nylon coating film)
To the obtained biaxially stretched nylon film, a PVDC solution in which polyvinylidene chloride (PVDC) is dissolved in a solvent (THF: tetrahydrofuran) is applied with a PVDC coating layer so that the thickness after drying becomes 2 μm, A biaxially stretched nylon coating film (coat / ONy) was obtained.
(Production of laminate packaging material)
The obtained biaxially stretched nylon stretched film was used as a surface base film, a 40 μm thick aluminum foil as an intermediate base material, and a 50 μm thick CPP film as a sealant film. / Al / CPP). The laminated film after dry lamination was aged at 40 ° C. for 3 days.
The deep-drawing moldability and acid resistance of the obtained laminate packaging material were evaluated. The obtained results are shown in Table 1.

[Examples 2-7, Comparative Examples 1-3]
As Examples 2 to 7 and Comparative Example 1, production conditions (stretch ratio, thickness, coating conditions) were appropriately adjusted by the production method shown in Example 1, and a biaxially stretched nylon film and a biaxially stretched nylon coating film were used. And the laminate packaging material was produced. In Example 5, instead of the PVDC solution, the PVDC coating layer is applied using a PVDC dispersion in which polyvinylidene chloride (PVDC) is dispersed in water using a suspension. In Example 6, instead of the PVDC coating layer, a polyester (PET) coating layer (thickness 2 μm) is applied.
The plane orientation degree of the obtained biaxially stretched nylon film was measured. The obtained results are shown in Table 1. Further, the deep drawability and acid resistance of the obtained laminate packaging material were evaluated. The obtained results are shown in Table 1.
On the other hand, as Comparative Examples 2 and 3, a biaxially stretched nylon film obtained by the production method shown in Table 1 was obtained, and the degree of plane orientation was measured in the same manner as in Example 1. The obtained results are shown in Table 1. In addition, laminate packaging materials were produced using the biaxially stretched nylon films of Comparative Examples 2 and 3, and the deep drawability and acid resistance were evaluated in the same manner as in Example 1. The obtained results are shown in Table 1.

As is clear from the results shown in Table 1, when the degree of plane orientation of the biaxially stretched nylon film satisfies the above conditions and a predetermined coating layer is provided (Examples 1 to 7), acid resistance And it was confirmed that both deep drawability can be achieved.
On the other hand, when the coating layer was not provided (Comparative Example 1), it was confirmed that the acid resistance of the laminate packaging material was insufficient. When the plane orientation degree of the biaxially stretched nylon film does not satisfy the above conditions (Comparative Examples 2 and 3), the deep drawability of the laminate packaging material obtained using this biaxially stretched nylon film is insufficient. It was confirmed.

  The biaxially stretched nylon coating film of the present invention is, for example, an industrial field (such as a packaging material for a lithium battery mounted on an electric vehicle, a tablet-type terminal device, a smartphone, etc.), a medical field (a press-through pack (PTP packaging material) Etc.), fields for daily use (refillable packaging for liquid detergents, etc.), packaging materials for the field of foods, etc., and can be suitably used as a packaging material that particularly requires pinhole resistance. In particular, the laminate packaging material of the present invention can be suitably used as a cold molding packaging material that requires excellent acid resistance and excellent deep drawability.

    3, 3A, 3B ... Biaxially stretched nylon film

Claims (6)

A biaxially stretched nylon coating film in which a coating layer is provided on a biaxially stretched nylon film made from nylon resin,
The biaxially stretched nylon film has a maximum refractive index value in the film plane of Nx, a minimum refractive index value in the film plane of Ny, and a film thickness direction of the film. When the refractive index value is Nz, the degree of plane orientation (P) satisfies the condition represented by the following formula (F1),
P = (Nx + Ny) /2−Nz≧0.042 (F1)
The coating layer is selected from the group consisting of polyvinylidene chloride, vinylidene chloride-vinyl chloride copolymer, maleic anhydride-modified polypropylene, polyester resin, epoxy resin, phenol resin, fluorine resin, cellulose ester, urethane resin, and acrylic resin. A biaxially stretched nylon coating film characterized by comprising at least one of the following. In the biaxially stretched nylon coating film according to claim 1,
The biaxially stretched nylon coating film, wherein the coating layer has a thickness of 0.5 μm or more. In the biaxially stretched nylon coating film according to claim 1 or 2,
The biaxially stretched nylon coating film, wherein the coating layer is a layer formed by a solvent coating method. In the biaxially stretched nylon coating film according to any one of claims 1 to 3,
The biaxially stretched nylon coating film, wherein the coating layer is made of at least one selected from the group consisting of polyvinylidene chloride and polyester resin.   A laminate packaging material comprising the biaxially stretched nylon coating film according to any one of claims 1 to 4 and a sealant film.   A molded body, which is cold-molded using the laminate packaging material according to claim 5.