JP2003253224A - Double-sided adhesive tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double-sided adhesive tape whose position can easily and surely be adjusted, whose adhesive has (adhesive force), (cohesive force) and (repulsion resistance) in a good balance, and which can strongly be fixed. <P>SOLUTION: This double-sided adhesive tape using an adhesive 1 (preferably additionally containing 20 to 50 pts.wt. of a hydrogenated petroleum resin, 0.01 to 10 pts.wt. of a tri-functional isocyanate- or epoxy-based cross-linking agent, and 0.01 to 5 pts.wt. of a photopolymerization initiator) (or, adhesive layers comprising the adhesive are laminated to both the sides of a substrate) having an acrylic polymer obtained by polymerizing a polymerizable composition consisting mainly of a 2 to 18C alkyl (meth)acrylate and an olefinic polymer having polymerizable unsaturated double bonds (preferably the copolymerization rate: 5 to 20 wt.%) is characterized in that a masking portion 2 (preferably covering rate: 5 to 50%) comprising a non-adhesive or finely adhesive material is formed on a portion of one side of the double-sided adhesive tape. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided pressure-sensitive adhesive tape, and more particularly to a double-sided pressure-sensitive adhesive tape which is preferably used when a decorative plate material is stuck on a base material in the interior of a building. In the present invention, the double-sided pressure-sensitive adhesive tape includes what is called a double-sided pressure-sensitive adhesive sheet.

[0002]

2. Description of the Related Art Conventionally, various decorative plate materials have been used for the purpose of providing interiors in buildings such as houses. For example, when constructing a floor surface, a floor material such as a flooring material is used as an ornamental plate material by being adhered and fixed onto a floor base material.
In this case, an adhesive has been mainly used as a method of adhesive fixing. Since it takes time for the adhesive to harden, it is excellent in that it is possible to easily perform delicate position adjustment after the floor material is laminated on the floor base material. However, since the time required for the adhesive to cure usually varies depending on the season, there is a problem in that the management of the work process during construction is complicated. Further, there is a problem that the solvent vapor contained in the adhesive has a bad effect on the human body.

In recent years, attempts have been made to construct a floor surface using a double-sided adhesive tape instead of an adhesive. However, when double-sided adhesive tape is used, the initial adhesive strength is high, so the floor material sticks to the floor base material with a light pressure bonding, and once sticking, it is difficult to adjust the subtle position of the floor material. There was a problem of becoming.

As a solution to the above problem, Japanese Patent Laid-Open No. 3-2
41168 gazette removes from the release paper of the double-sided adhesive tape an adhesive layer in an amount corresponding to the length from the tip of the double-sided adhesive tape having a release paper on the surface to the width of the floor board material to be constructed, Fold back the removed release paper in the longitudinal direction,
The floorboard is placed on the folded backing paper to confirm or position the floorboard, and then the folded backing paper is pulled out by the width of the floorboard, and the floorboard is pressed and fixed. A method for constructing a flooring material in which the above steps are sequentially repeated as necessary is disclosed. However, in the floor material construction method described in the above publication, when the folded back release paper is pulled out, the release paper may be broken, and if it is broken, it is necessary to re-roll the floor material and remove the broken release paper. Therefore, it was not always a reliable construction method.

Furthermore, in recent years, air-conditioning and heating equipment in houses such as buildings has been widely used, and, for example, floor heating equipment has been often adopted. In this case, however, a large temperature change occurs in the floor base material, and therefore the floor material. Thermal expansion and contraction easily occur. Therefore, in order to suppress the thermal expansion and contraction of the floor material, the floor material and the floor base material are required to be firmly fixed over a wide range.
Therefore, the pressure-sensitive adhesive used for the double-sided pressure-sensitive adhesive tape needs to have a higher cohesive force in order to exhibit a strong pressure-sensitive adhesive force against a large temperature change.

[0006]

Generally, as a method of increasing the cohesive force of a pressure-sensitive adhesive, a method of adding a cross-linking agent to the pressure-sensitive adhesive and crosslinking it is used. However, according to the study of the present inventors, if the amount of the crosslinking agent added is too large, the resulting composition becomes hard and the cohesive force is improved, but the repulsion resistance (that is, the performance of suppressing the warp of the flooring material) is deteriorated. In addition to the drawbacks, the adhesive strength to the adherend also decreases. On the contrary, when the amount of the crosslinking agent is too small, the resulting composition tends to be soft and the cohesive force tends to be low. Therefore, in the conventional double-sided pressure-sensitive adhesive tape, it is difficult to balance "adhesive force", "cohesive force", and "repulsion resistance". In addition, the above-mentioned problem has been a problem not only in fixing floor materials but also in fixing various decorative plate materials to base materials in houses such as buildings.

The object of the present invention is to easily and surely adjust the position of a decorative plate material when it is attached to a base material in the interior of a conventional building, etc. An object of the present invention is to provide a double-sided pressure-sensitive adhesive tape which has an excellent balance of "force" and "repulsion resistance" and which can firmly fix a decorative plate material onto a base material.

[0008]

A double-sided pressure-sensitive adhesive tape according to claim 1 is a olefin-based heavy-duty tape having a (meth) acrylic acid ester having an alkyl group having 2 to 18 carbon atoms and a polymerizable unsaturated double bond at the terminal. A double-sided pressure-sensitive adhesive tape using a pressure-sensitive adhesive having an acrylic copolymer obtained by polymerizing a polymerizable composition whose main component is a non-adhesiveness, which covers a part of the surface on one side. Alternatively, a masking portion made of a slightly adhesive material is formed. Claim 2
The double-sided pressure-sensitive adhesive tape according to claim 1, which is the double-sided pressure-sensitive adhesive tape according to claim 1, further comprising a hydrogenated petroleum-based resin and an isocyanate-based or epoxy-based crosslinking agent having a trifunctional group. Characterize. The double-sided pressure-sensitive adhesive tape according to claim 3 is the double-sided pressure-sensitive adhesive tape according to claim 2, wherein the copolymerization ratio of the olefin polymer having a polymerizable unsaturated double bond in the acrylic copolymer is 5 to 20.
% By weight, 20 to 50 parts by weight of hydrogenated petroleum-based resin, and 0.01 to 100 parts by weight of an isocyanate-based or epoxy-based crosslinking agent having a trifunctional group, based on 100 parts by weight of an acrylic copolymer. It is characterized by containing 10 parts by weight. The double-sided adhesive tape according to claim 4 is the same as in claim 2.
The double-sided pressure-sensitive adhesive tape according to any one of claims 1 to 3, wherein the pressure-sensitive adhesive further contains 0.01 to 5 parts by weight of a photopolymerization initiator with respect to 100 parts by weight of the acrylic copolymer. Characterize. The double-sided pressure-sensitive adhesive tape according to claim 5 is the double-sided pressure-sensitive adhesive tape according to any one of claims 1 to 4, wherein a pressure-sensitive adhesive layer made of a pressure-sensitive adhesive is laminated on both surfaces of the base material. To do. The double-sided adhesive tape according to claim 6 is the double-sided adhesive tape according to any one of claims 1 to 5,
The masking portion has a coverage of 5 to 50%.

The present invention will be described in detail below. The pressure-sensitive adhesive used in the present invention has an alkyl group having 2 carbon atoms.
To (18) (meth) acrylic acid ester and an acrylic copolymer obtained by polymerizing a polymerizable composition containing an olefin polymer having a polymerizable unsaturated double bond at a terminal as a main component. is there.

Alkyl group having 2 to 18 carbon atoms (meth)
Examples of the acrylate ester include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate,
N-Butyl (meth) acrylate, (meth) acrylic acid s
ec-butyl, t-butyl (meth) acrylate, cyclohexyl (meth) acrylate, n (meth) acrylate
-Octyl, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isononyl (meth) acrylate, isomyristyl (meth) acrylate, and the like, which may be used alone or 2 You may use together 1 or more types. The term "(meth) acrylic acid" used in the present invention means "acrylic acid" or "methacrylic acid".
Means

The above-mentioned olefin polymer having a polymerizable unsaturated double bond has a double bond copolymerizable with another polymerizable monomer at the end, and a polymer structure having an olefin main skeleton. If it is, it will not be specifically limited. Specific examples of the olefin skeleton include:
Examples thereof include ethylene-butylene random copolymers and ethylene-propylene copolymers. Examples of commercially available ethylene-butylene random copolymers include "HPVM-1253" manufactured by Shell Chemical Co., Ltd.

The copolymerization ratio of the olefinic copolymer having a polymerizable unsaturated double bond at the terminal is preferably 5 to 20% by weight based on the acrylic copolymer. When the copolymerization ratio is less than 5% by weight, the adhesiveness to the decorative plate material or the base material is likely to decrease, and when it exceeds 20% by weight, the copolymerization monomer solution may gel and the copolymerization reaction may become difficult.

The weight average molecular weight of the olefin polymer is preferably 2000 to 8000. When the weight average molecular weight is less than 2,000, the effect of improving the adhesiveness to the decorative plate material and the base material tends to be small, and when the weight average molecular weight exceeds 8,000, the flexibility of the obtained acrylic copolymer tends to be lowered.

A copolymerizable monomer having an unsaturated double bond is further added to the above-mentioned polymerizable composition in order to adjust the glass transition temperature (Tg) and tackiness of the resulting acrylic copolymer. May be. Examples of the copolymerizable monomer include styrene-based monomers such as styrene, α-methylstyrene, o-methylstyrene, and p-methylstyrene; carboxylic acid vinyl esters such as vinyl acetate; vinyl groups such as acrylic acid and methacrylic acid. Carboxylic acid containing; anhydride of carboxylic acid containing vinyl group; vinyl monomer containing hydroxyl group such as 2-hydroxyethyl (meth) acrylate and 4-hydroxybutyl acrylate; nitrogen containing vinyl such as (meth) acrylonitrile and N-vinylpyrrolidone Examples thereof include monomers, and these may be used alone or in combination of two or more kinds.

When the amount of the above-mentioned copolymerizable monomer is increased, the flexibility of the obtained pressure-sensitive adhesive is lowered and the followability to the uneven surface is apt to be deteriorated. It is preferably 20% by weight or less.

The pressure-sensitive adhesive in the present invention preferably contains a hydrogenated petroleum-based resin in order to improve heat resistance and adhesion to the decorative plate material and the base material. In the above hydrogenated petroleum-based resin, when polymerizing an acrylic polymer by ultraviolet polymerization or the like, the double bond structure of the resin does not cause polymerization inhibition, and is partially or completely hydrogenated. Need to be present.

Examples of the hydrogenated petroleum resin include an aliphatic resin obtained by cationically polymerizing a C5 fraction of naphtha cracked oil and an aromatic resin obtained by cationically polymerizing a C9 fraction of a naphtha cracked oil. System, a copolymer system in which the aforementioned C5 fraction and C9 fraction are mixed at an appropriate ratio and subjected to cationic polymerization, and an alicyclic system in which the main chain structure of these petroleum-based resins is cyclic. Examples include hydrogenated products,
Among them, the completely hydrogenated alicyclic petroleum resin is preferable from the viewpoint of stability of pressure-sensitive adhesive physical properties. In addition, these hydrogenated petroleum-based resins can be used alone or in combination of two or more kinds.

The hydrogenated petroleum resin content is preferably 20 to 50 parts by weight, more preferably 30 to 40 parts by weight, based on 100 parts by weight of the acrylic copolymer. If the content is less than 20 parts by weight, the effect of improving the adhesiveness to the decorative plate material and the base material tends to be small, and if it exceeds 50 parts by weight, the flexibility is lowered and the followability to uneven surfaces is lowered. It will be easier.

The pressure-sensitive adhesive in the present invention preferably has a crosslinked structure in order to enhance cohesive force and heat resistance and creep properties. Examples of the method include a method of copolymerizing a crosslinkable monomer having two or more unsaturated double bonds capable of copolymerization in the molecule, and a method of using a crosslinking agent. When the cross-linking agent is used, it is preferable to use a cross-linking agent having a functional group that reacts with the cross-linking agent, and it is particularly preferable to use an isocyanate-based or epoxy-based cross-linking agent having a trifunctional group. By containing and using the cross-linking agent, it is possible to achieve a balance between heat resistance and tackiness of the pressure-sensitive adhesive. When the functional group of the cross-linking agent is a bifunctional group, the cross-linking structure of the obtained pressure-sensitive adhesive becomes rough and the tackiness is improved, but the heat resistance may be lowered. When the functional group of the cross-linking agent is a tetra-functional group or more, the cross-linking structure of the obtained pressure-sensitive adhesive becomes too dense and the heat resistance is improved, but the pressure-sensitive adhesiveness may be lowered.

The isocyanate cross-linking agent having a trifunctional group is not particularly limited as long as it has a trifunctional group in one molecule. For example, triphenylmethane triisocyanate or tolylene diisocyanate is added to trimethylolpropane. A trimethylolpropane adduct of hexamethylene diisocyanate, or a buret crosslinked product of a prepolymer having these isocyanate groups at the ends.

The epoxy-based cross-linking agent having a trifunctional group is not particularly limited as long as it has a trifunctional group in one molecule, and examples thereof include a trimethylolpropane adduct of glycerin triglycidyl ether or polyglycidyl ether. , Trimethylolpropane adduct of aliphatic polyglycidyl ether, and the like. These isocyanate crosslinking agents or epoxy crosslinking agents can be used alone or in combination of two or more.

The content of the crosslinking agent having the trifunctional group is preferably 0.01 to 10 parts by weight, more preferably 0.03 to 5 parts by weight, based on 100 parts by weight of the acrylic copolymer. This is because if the content is less than 0.01 parts by weight, the heat-resistant creep resistance tends to decrease, and if it exceeds 10 parts by weight, the flexibility decreases and the followability to curved surfaces and uneven surfaces tends to decrease.

If desired, various additives may be added to the pressure-sensitive adhesive of the present invention. Examples of the additive include a plasticizer, a softener, an inorganic or organic filler, a thickener,
Examples include pigments and dyes.

The polymerization method for obtaining the pressure-sensitive adhesive in the present invention is not particularly limited, but among these, ultraviolet polymerization is preferable. In the case of photopolymerization typified by UV polymerization, the acrylic copolymer obtained by thermal polymerization has good molecular weight reproducibility, a uniform polymer is easily obtained, and a thick film polymer is obtained. This is because it is easy to obtain a pressure-sensitive adhesive that is excellent in conformability to a curved surface or an uneven surface and has little pressure-bonding pressure dependency (adhesive enough even with low pressure-bonding).

Examples of the photopolymerization initiator used in the above photopolymerization include ketone systems such as 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone ("Darocur 2959" manufactured by Merck); α-hydroxy-α, α-dimethyl-acetophenone (“Darocur 1173” manufactured by Merck), methoxyacetophen, 2,2-dimethoxy-2-phenylacetophen (“Irgacure 651” manufactured by Ciba-Geigy), 2-hydroxy-2 -Acetophenone type such as cyclohexyl acetophenone ("Irgacure 184" manufactured by Ciba Geigy); ketal type such as benzyl dimethyl ketal;
Others, halogenated ketones, acylphosphinoxides,
Examples thereof include conventionally known ones such as acylphosphonate.

The content of the photopolymerization initiator is preferably 0.01 to 5 parts by weight with respect to 100 parts by weight of the acrylic copolymer. If the amount used is less than 0.01 parts by weight, the reaction initiation density will be insufficient, and the monomer will remain and the heat resistance and adhesiveness will tend to decrease. When the amount used exceeds 5 parts by weight, the reaction rate increases, but the molecular weight of the copolymer decreases, and the adhesive performance tends to fluctuate or decrease.

In the present invention, the double-sided pressure-sensitive adhesive tape using the pressure-sensitive adhesive may be a so-called non-support type in which the pressure-sensitive adhesive is used alone, or a laminate of two or more layers. Good. In the case of a laminate having two or more layers, for example, the pressure-sensitive adhesive layer made of the above-mentioned pressure-sensitive adhesive is laminated on both surfaces of the base material.

The above-mentioned substrate is not particularly limited, and examples thereof include papers such as Japanese paper and non-woven fabric, olefin films such as polyethylene, polyethylene terephthalate (PET), oriented polypropylene (OPP) and polyurethane, and foams thereof. As the core material of the double-sided pressure-sensitive adhesive tape, conventionally known ones can be used.

The thickness of the pressure-sensitive adhesive when the above double-sided pressure-sensitive adhesive tape is used alone, or the thickness of the pressure-sensitive adhesive layer when it is a laminate of two or more layers, is preferably 0.05 to 3 mm. When the thickness is less than 0.05 mm, it is difficult to follow the irregularities of the adherend, the adhesive area is reduced, and the adhesive performance is likely to be reduced. When the thickness is 3 mm or more, the pressure bonding pressure is not sufficiently transmitted to the adherend interface under the condition of light pressure bonding, and similarly the adhesive area is likely to decrease.

The double-sided pressure-sensitive adhesive tape of the present invention has a masking portion formed on one surface and made of a non-tacky or slightly tacky material that covers a part of the surface. When the masking portion is formed, the position can be adjusted easily and reliably when the decorative plate material or the like is attached to the base material.

For this reason, the material forming the masking portion (hereinafter sometimes referred to as "masking member") protrudes from the surface of the adhesive surface of the double-sided pressure-sensitive adhesive tape on the side where the masking portion is formed, forming a convex portion. Is preferably provided. The form of the dispersed arrangement of the convex portions is not particularly limited, and may be an appropriate form such as linear, matrix or random.

Any non-adhesive or slightly adhesive material constituting the masking portion may be used as long as it is non-adhesive or slightly adhesive, insoluble in the adhesive, and has some shape retention. It can be a material,
Among them, a mesh material is preferably used.

Examples of the non-adhesive material include natural fibers, synthetic fibers (for example, fibers made of polyethylene, polypropylene or polyethylene terephthalate), glass fibers, metal fibers, woven materials thereof, nets, and the like.
Examples include a mesh-like product having a large number of openings such as a wallif, a woven fabric, and a non-woven fabric. Also, in some cases glass beads,
Glass balloons, silica beads, aluminum oxide beads, synthetic resin beads, synthetic resin balloons and the like can also be used. Further, as the slightly tacky material, for example, a rubber-based material having a slight tackiness on the surface of the non-tacky material,
Examples thereof include those coated with various pressure-sensitive adhesives such as acrylic, ethylene-vinyl acetate copolymer, and polyoxypropylene-based adhesives, acrylic microsphere-shaped adhesives, and acrylic microsphere-shaped adhesives themselves. These non-adhesive or slightly adhesive materials may be used alone or in combination of two or more kinds.

The coverage of the masking portion in the double-sided pressure-sensitive adhesive tape of the present invention is not particularly limited as long as the effect of the present invention is not impaired, but it is 5 to 50 of the area of the pressure-sensitive adhesive surface on the side where the masking portion is formed. % Is preferable. When the coverage is less than 5%, the positioning adjustment function of the double-sided adhesive tape may be insufficient, and conversely the coverage is 50%.
If it exceeds, the adhesiveness of the double-sided adhesive tape may be insufficient.

The maximum thickness of the masking member (for example,
The intersection thickness of the yarns that make up the masking member is
Although not particularly limited, it is preferably 0.01 to 0.1 mm. If the maximum thickness is less than 0.01 mm,
The masking member may be buried inside the pressure-sensitive adhesive surface with a small pressure, which makes it difficult to adjust the position. If it exceeds 0.1 mm, the pressure-bonding force may be insufficient during pressure-bonding, and the adhesiveness may decrease.

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be further described below with reference to the drawings. FIG. 1 is a schematic perspective view showing an example of the double-sided adhesive tape of the present invention. FIG. 2 is a schematic cross-sectional view illustrating the method of using the present invention.

As shown in FIG. 1, the double-sided pressure-sensitive adhesive tape of the present invention has a pressure-sensitive adhesive surface 3 which constitutes one surface of the sheet-shaped pressure-sensitive adhesive 1.
The masking portion 2 is formed to cover a part of the surface of the.

As a method of using the double-sided adhesive tape of the present invention, as shown in FIG.
On the side where the masking portion 2 is not formed (hereinafter, may be referred to as “non-masking side”), the decorative plate material 5 or the like is attached to the adhesive surface 4 and the side where the masking portion 2 is formed (hereinafter, “masking”). 2) is placed on the base material 6 as shown in FIG. 2A, the position is adjusted as necessary, and then pressure bonding is performed, as shown in FIG. 2B. A method of fixing on the base material is used.

As a material for forming the masking portion 2, for example, a mesh material is preferably used, and the shape thereof is, for example, as shown in FIG. 3, gauze 11 made of cotton thread, and shown in FIG. So that the square opening 12a
Examples include a net 12 made of a synthetic resin in which are dispersed, a net 13 made of a synthetic resin sheet having openings 13a with rounded corners as shown in FIG.

Of course, the shape of the opening in the masking member, that is, the portion that does not cover the adhesive surface 3 is not limited to a square or a shape in which the corner portion of the square is rounded, and may be a circular shape or any other shape.

(Function) In the present invention, when a specific cross-linking agent having a trifunctional group is contained, the pressure-sensitive adhesive is improved in a well-balanced manner at high levels of adhesive strength, cohesive strength and repulsion resistance. The reason why such a pressure-sensitive adhesive can be provided is not yet fully clarified, but it is introduced into an acrylic copolymer by copolymerizing an olefin polymer having a polymerizable unsaturated double bond at the terminal. It is considered that, in this case, the olefin end which is not cross-linked and tends to exist is cross-linked to some extent by the action of the cross-linking agent, and the cohesive force at high temperature is improved.

On the other hand, important properties required of the pressure-sensitive adhesive at high temperature are adhesive strength, cohesive strength, and repulsion resistance, and hydrogenated petroleum is preferable in order to enhance the effect of improving the adhesive strength to polyolefin. A system resin is contained. In order to improve the repulsion resistance, cross-linking between the hydrogenated petroleum-based resins and the hydrogenated petroleum-based resins and the acrylic copolymer at a constant ratio of the low-molecular hydrogenated petroleum-based resins may be performed. Considered to be effective. Hydrogenated petroleum-based resins usually do not have a functional group such as a carboxyl group and a hydroxyl group, and do not react with an isocyanate-based cross-linking agent or an epoxy-based cross-linking agent generally used in the cross-linking of acrylic pressure-sensitive adhesives With hydrogenated petroleum resin 3
When it contains a specific cross-linking agent having a functional group, the cross-linking agent is decomposed by heat to cause a hydrogen abstraction reaction,
As a result, it becomes possible to form crosslinks between hydrogenated petroleum-based resins without interposing a functional group, and between hydrogenated petroleum-based resins and acrylic copolymers, and not only adhesion and cohesive force It is presumed that the repulsion resistance, which was conventionally difficult, can be improved at a high level.

[0043]

EXAMPLES (Example 1) The present invention will be specifically described by showing Examples and Comparative Examples below. The present invention is not limited to the following examples. <Preparation of Polymerizable Monomer Solution> 100 parts by weight of 2-ethylhexyl acrylate as an acrylic acid ester (8 carbon atoms in the alkyl group), 2 parts by weight of acrylic acid as a copolymerizable monomer having an unsaturated double bond, and a polymerizable monomer at the end. 15 parts by weight of ethylene-butylene random copolymer having a saturated double bond ("HPVM-1253" manufactured by Shell Chemical Co., Ltd.), fully hydrogenated alicyclic saturated hydrocarbon-based petroleum resin ("Arcon P100" manufactured by Arakawa Chemical Co., Ltd.) 25 parts by weight and 0.1 part by weight of a trifunctional isocyanate crosslinking agent (“Coronate” manufactured by Nippon Polyurethane Co., Ltd.) are uniformly mixed, and further 3 parts by weight of a thickener (“AE200” manufactured by Nippon Aerosil Co., Ltd.), photopolymerization. 2,2-Dimethyl-2-phenylacetophenone (“Irgacure 651” manufactured by Ciba-Geigy) as an initiator.
After adding 05 parts by weight and stirring in a glass bottle, residual oxygen was removed by bubbling with nitrogen gas to prepare a polymerizable monomer solution.

<Preparation of double-sided adhesive tape> 300 mm × 2
50 mm size glass plate, thickness 38 after mold release treatment
A polyethylene terephthalate (PET) film having a thickness of .mu.m was laid, a spacer having a thickness of 0.1 mm was placed on the PET film, the polymerizable monomer solution was developed, and a PET film having a thickness of 38 .mu.m that was also subjected to release treatment was laid. A 300 mm × 250 mm size glass plate was covered and the polymerizable monomer solution was sandwiched. In this state, ultraviolet rays were irradiated for 10 minutes by a chemical lamp so that the irradiation intensity on the glass plate surface of the coating was 10 mW / cm ^2, and photopolymerization was carried out to obtain a sheet-like pressure-sensitive adhesive having an acrylic copolymer. Then, aged for 72 hours in a 60 ° C gear oven and then crosslinked, and then the glass plates and the PET film on both sides are peeled off,
As a masking member, polyethylene Sof (“NA33” manufactured by Sekisui Kako Co., Ltd., maximum thickness 0.06 mm) is laminated to form a masking portion, and the thickness is 0.1 as illustrated in FIG.
A double-sided pressure-sensitive adhesive tape in which the masking portion 2 was formed on one surface of the sheet-shaped pressure-sensitive adhesive 1 of mm was obtained. The coverage of the masking portion 2 was 33%.

Example 2 In place of the trifunctional isocyanate cross-linking agent, trimethylolpropane type tri-functional aliphatic epoxy cross-linking agent ("YH300" manufactured by Tohto Kasei Co., Ltd.) 0.2
Part, instead of the fully hydrogenated alicyclic saturated hydrocarbon petroleum resin,
A double-sided pressure-sensitive adhesive tape having a coverage rate of 33% for the masking portion 2 was prepared in the same manner as in Example 1 except that 35 parts of the partially hydrogenated alicyclic saturated hydrocarbon-based petroleum resin (“ALCON M100” manufactured by Arakawa Chemical Co., Ltd.) was used. Obtained.

(Example 3) Polypropylene net as a masking member ("O" manufactured by Nisseki Sheet Pallet System Co., Ltd.)
A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that N5340 "having a maximum thickness of 0.5 mm) was used. The masking portion 2 had a coverage of 10%. Example 4 A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the completely hydrogenated alicyclic saturated hydrocarbon-based petroleum resin was not used at all.

Comparative Example 1 A sheet having a thickness of 0.5 mm was prepared in the same manner as in Example 1 except that no ethylene-butylene random copolymer having a polymerizable unsaturated double bond at the end was used. Masking part 2 on one side of adhesive 1
A double-sided pressure-sensitive adhesive tape formed with was obtained. (Comparative Example 2) Example 1 except that the ethylene-butylene random copolymer having a polymerizable unsaturated double bond at the terminal and the completely hydrogenated alicyclic saturated hydrocarbon-based petroleum resin were not used at all. A double-sided adhesive tape was obtained in the same manner. (Comparative Example 3) An ethylene-butylene random copolymer having a polymerizable unsaturated double bond at the terminal and a completely hydrogenated alicyclic saturated hydrocarbon-based petroleum resin were not used at all and replaced with a trifunctional isocyanate-based crosslinking agent. Then, on one side of the sheet-like pressure-sensitive adhesive 1 having a thickness of 0.5 mm in the same manner as in Example 1 except that 0.3 parts of amine-type 4-functional epoxy crosslinking agent (“YH434” manufactured by Tohto Kasei Co., Ltd.) was used. A double-sided pressure-sensitive adhesive tape having the masking portion 2 formed thereon was obtained. (Comparative Example 4) An ethylene-butylene random copolymer having a polymerizable unsaturated double bond at the terminal and a completely hydrogenated alicyclic saturated hydrocarbon-based petroleum resin were not used at all and replaced with a trifunctional isocyanate-based crosslinking agent. Then, a double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that 3 parts of a bisphenol A type bifunctional epoxy crosslinking agent (“YD128” manufactured by Tohto Kasei Co., Ltd.) was used. (Comparative Example 5) A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that no masking member was used.

The pressure-sensitive adhesive tape obtained as described above was evaluated under the following evaluation conditions. <Evaluation conditions> (Adhesive gel fraction) 20 mm x 20 m double-sided adhesive tape
The adhesive was immersed in a beaker containing a THF (tetrahydrofuran) solvent, and the beaker was immersed in hot water at 40 ° C. for 48 hours. Next, the THF solution in which the pressure-sensitive adhesive was partially dissolved was taken out on a 200-mesh wire net, and the THF-insoluble portion of the pressure-sensitive adhesive was separated. The pressure-sensitive adhesive obtained by separation was dried, the weight of the pressure-sensitive adhesive after immersion was measured, and the gel fraction was determined by the following formula. Gel fraction (%) = {[(weight of adhesive before immersion)-(weight of adhesive after immersion)] / (weight of adhesive before immersion)} × 10
0

(Position controllability): Sensory evaluation of position control In an atmosphere with a temperature of 23 ° C. and a humidity of 65 RH%, the double-sided adhesive tape was cut into a width of 20 mm, and the double-sided adhesive tape was cut into a 50 mm × 50 mm size plywood. I pasted the non-masking side. Next, with the double-sided pressure-sensitive adhesive tape attached to the plywood placed on the glass plate so that the masking side was in contact, the plywood was slid by hand, and the sliding state was evaluated according to the following criteria. ◯: It can slide on the glass surface with a light force without resistance. X: The resistance is large, and it does not slip unless strong force is applied, or
Stick to the glass plate.

(90 Degree Peeling Force): Substitute Test for Adhesion Force In accordance with JIS Z0237, the 90 degree peeling force for the stainless (SUS) plate and the veneer plate on the non-masking side and the masking side was measured. Peeling force on the non-masking side: In an atmosphere of a temperature of 23 ° C. and a humidity of 65 RH%, a double-sided adhesive tape was cut into a width of 25 mm, and a 100 μm stainless steel foil was attached to the adhesive surface on the masking side for backing. After the adhesive surface on the masking side was placed in contact with the surface of each adherend such as a stainless steel (SUS) plate or a veneer plate, a 2 kg roller was reciprocated once at a speed of 300 mm / min to perform pressure bonding on the backed surface. Next, in the same atmosphere (temperature 23 ° C, humidity 65RH%), 24
After being left for a period of time, it was pulled in a 90 degree direction at a pulling speed of 300 mm / min with a tensile tester to measure a 90 degree peeling force. Peeling force on the masking side: The non-masking side adhesive surface is backed and the masking side adhesive surface is made of stainless steel (S
The 90-degree peeling force was measured in the same manner as the peeling force on the non-masking side except that the pressure was applied to the surface of each adherend such as a US) plate or a veneer plate.

(40.degree. C. holding power): Substitution test for cohesive force In accordance with JIS Z0237, the holding power to the stainless (SUS) plate on the non-masking side and the masking side was measured. Holding power on non-masking side: Air temperature 23 ℃
In an atmosphere with a humidity of 65 RH%, the double-sided adhesive tape was cut into a 25 mm square size, and a 25 μm PET film was attached to the adhesive surface on the masking side for backing.
The other non-masking adhesive side is stainless steel (SUS)
After being placed so as to be in contact with the surface of the plate, a 2 kg roller was reciprocated once at a speed of 300 mm / min and pressure-bonded on the backed surface and left for 20 minutes. Next, after curing for 1 hour in a 40 ° C. oven, a load of 1 kg was applied and the drop time was measured. If the adhesive did not fall, the deviation of the adhesive after 24 hours [deviation of adhesive surface between non-masking side and masking side (unit: mm)] was measured. Holding power on masking side: Adhesive surface on non-masking side is backed and adhesive surface on masking side is made of stainless steel (SU
S) It was measured in the same manner as the holding force on the non-masking side except that the pressure was applied to the plate surface.

(Constant load holding power): Repulsion resistance substitute test: According to JIS Z0237, 9 against stainless (SUS) plate on non-masking side and masking side.
The 0 ° constant load holding force was measured. Holding power under constant load on non-masking side: In an atmosphere of temperature 23 ° C and humidity 65RH%, double-sided adhesive tape is cut into a width of 20 mm, and a 25 μm PET film is attached to the adhesive surface on the masking side for backing. The adhesive surface on the non-masking side was placed in contact with the surface of the stainless (SUS) plate, and then a 2 kg roller was reciprocated once at a speed of 300 mm / minute to perform pressure bonding on the backed surface. Next, under the same atmosphere (temperature 23
After standing for 24 hours at a temperature of 65 ° C. and a humidity of 65 RH%, a load of 80 g was applied in an oven at 80 ° C., and the peeling length (unit: mm) after 3 hours was measured. Constant load holding force on the masking side: Measured in the same manner as the constant load holding force on the non-masking side, except that the adhesive surface on the non-masking side was backed and the adhesive surface on the masking side was pressed onto the stainless (SUS) plate surface. did.

Table 1 shows the compounding table in the above-mentioned Examples and Comparative Examples. The evaluation results obtained are shown in Table 2.

[0054]

[Table 1]

[Table 2]

As is clear from Table 2, the double-sided pressure-sensitive adhesive tape of the present invention has a good position adjusting property, peeling force (adhesive force), holding force (cohesive force) and constant load holding force (repulsion resistance). It was found that the balance of (sex) was excellent.

[0056]

The double-sided pressure-sensitive adhesive tape of the present invention comprises a (meth) acrylic acid ester having an alkyl group having 2 to 18 carbon atoms and an olefin polymer having a polymerizable unsaturated double bond at the end as main components. A double-sided pressure-sensitive adhesive tape using a pressure-sensitive adhesive having an acrylic copolymer obtained by polymerizing a polymerizable composition, wherein the one-sided non-tacky or slightly tacky material covers a part of the surface. Since the masking part is formed, it is possible to easily and reliably adjust the position when attaching the decorative plate material on the base material in the interior of a building, etc. "Repulsion resistance"
It has an excellent balance of properties and can firmly fix the decorative plate material on the base material. For this reason, for example, while exhibiting good workability in so-called fitting and fixing in which a decorative plate material or the like is fitted and fixed to the pasting surface,
It is possible to suppress the expansion and contraction and warpage of the decorative plate material due to cooling and heating.

A specific amount of hydrogenated petroleum resin,
If the isocyanate-based or epoxy-based cross-linking agent having a trifunctional group and a photopolymerization initiator are further contained and the masking portion has a specific coverage, the above effect is further secured.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an example of a double-sided adhesive tape of the present invention.

FIG. 2 is a schematic cross-sectional view illustrating a method of using the present invention.

FIG. 3 is a plan view for explaining an example of a masking member.

FIG. 4 is a plan view for explaining another example of the masking member.

FIG. 5 is a plan view for explaining still another example of the masking member.

[Explanation of symbols] 1 Sheet adhesive 2 Masking section 3 Adhesive surface (masking side) 4 Adhesive surface (non-masking side) 5 Decorative plate material 6 Base material

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4J004 AA01 AA02 AA10 CA04 CC02                       CE03 DB03 EA05 FA08                 4J040 DF031 DN032 EC002 EF262                       KA15 KA16 MA06 MA08 MA10                       MB09 NA12

Claims (6)

[Claims] 1. A polymerizable composition mainly comprising a (meth) acrylic acid ester having an alkyl group having 2 to 18 carbon atoms and an olefin polymer having a polymerizable unsaturated double bond at a terminal is polymerized. A double-sided pressure-sensitive adhesive tape using a pressure-sensitive adhesive having an acrylic copolymer obtained as described above, wherein a masking portion made of a non-tacky or slightly tacky material that covers a part of the surface is formed on one side. A double-sided adhesive tape characterized in that 2. The double-sided pressure-sensitive adhesive tape according to claim 1, wherein the pressure-sensitive adhesive further contains a hydrogenated petroleum-based resin and an isocyanate-based or epoxy-based crosslinking agent having a trifunctional group. 3. The copolymerization ratio of the olefinic polymer having a polymerizable unsaturated double bond in the acrylic copolymer is 5 to 20% by weight, and the adhesive is added to 100 parts by weight of the acrylic copolymer. On the other hand, the hydrogenated petroleum resin is contained in an amount of 20 to 50 parts by weight, and the isocyanate or epoxy crosslinking agent having a trifunctional group is contained in an amount of 0.01 to 10 parts by weight. Adhesive tape. 4. The adhesive according to claim 1, further comprising 0.01 to 5 parts by weight of a photopolymerization initiator based on 100 parts by weight of the acrylic copolymer. 1
Double-sided adhesive tape according to item. 5. A pressure-sensitive adhesive layer made of a pressure-sensitive adhesive is laminated on both surfaces of a base material, according to any one of claims 1 to 4.
Double-sided adhesive tape according to item. 6. The double-sided pressure-sensitive adhesive tape according to claim 1, wherein the masking portion has a coverage of 5 to 50%.