JP2009191193A - Adhesive composition for laminating film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive composition that has no white turbidity and excellent transparency even being allowed to stand under high temperature and high humidity conditions for a long period of time and is useful for lamination between a fluorine-based film and a polyester-based film causing slight reduction in bond strength. <P>SOLUTION: The adhesive composition for lamination between a fluorine-based film and a polyester-based film comprises (D) a glycidyl group-containing acrylate-modified styrene block copolymer obtained by reacting (a) a styrene block copolymer with (b) a glycidyl group-containing acrylate monomer in the presence of (c) a polymerization initiator, (E) a tackifier having a softening point of ≥100°C and (F) a crosslinking agent. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an exterior adhesive composition that can be bonded to a polyester film and a film having a low wetting tension such as a fluorine-based film that is difficult to adhere.

  At present, a method for applying a fluorine-based film on the surface has been established for various purposes such as building material exterior use and home appliance use in order to improve weatherability and durability. These are, for example, bonded to a general-purpose plastic film such as a fluorine-based film and a polyester-based resin, but in many cases, an adhesive is applied or applied to the general-purpose plastic film side, and the fluorine-based film and a molded product are bonded together. The fluorine film used here is a fluorine film such as polyvinyl fluoride (PVF), polytetrafluoroethylene (PTFE), or polyvinylidene fluoride (PVDF), and a copolymer of tetrafluoroethylene and ethylene (ETFE). The film etc. which were shape | molded by the copolymer of the monomer containing fluorine, etc., and the monomer which does not contain fluorine. The general-purpose plastic resin used here refers to molded articles and films of inexpensive and highly moldable resins such as ABS, PP, and PET. As the adhesive used for the fluorine-based film, an acrylic-based pressure-sensitive adhesive (see Patent Document 1) and a polyurethane-based adhesive combined with isocyanate are often used. Adhesives can be adhered to fluorine films that are relatively difficult to adhere because they retain stickiness. Polyurethane adhesives also exhibit heat resistance when used in combination with a crosslinking agent. Is possible.

Japanese Patent Laid-Open No. 06-145615

However, Patent Document 1 and the like, which are coated from an acrylic polymer solution, have a problem in durability although the adhesive composition is devised.
Furthermore, the pressure-sensitive adhesive exhibits high adhesive strength at a temperature of 50 ° C. or lower, but has low heat resistance at 50 ° C. or higher. Therefore, the adhesive may be peeled off in applications exposed to a high temperature atmosphere, and has high heat resistance. It was unsuitable for use. In addition, although polyurethane adhesives combined with isocyanates exhibit heat resistance, they do not adhere unless surface treatment such as corona discharge treatment or flame treatment is applied to fluorine films with low wetting tension, and they are long-lasting under high temperatures and high humidity. Since it hydrolyzes when it is left for a period of time (for example, in an atmosphere of 85 ° C. and 85% RH), there is a problem that the adhesive strength is greatly reduced.
The present invention is excellent in transparency without white turbidity even when left at high temperature and high humidity for a long time. An adhesive composition to be used is provided.

  As a result of diligent research, the present inventor has added a tackifier and a crosslinking agent to a synthetic product obtained by heating and stirring a styrene block copolymer and a glycidyl group-containing acrylate monomer in the presence of a polymerization initiator. By blending, adhesive that adheres to films that have low wetting tension and are difficult to adhere, such as fluorine-based films, and has heat resistance and moisture resistance superior to polyurethane adhesives that use pressure-sensitive adhesives and isocyanates in combination Found to get.

The present invention provides (1) (D) a glycidyl group-containing acrylate-modified styrene block obtained by reacting [1] (a) a styrene block copolymer and (b) a glycidyl group-containing acrylate monomer in the presence of (c) a polymerization initiator. The present invention relates to an adhesive composition for laminating a fluorine-based film and a polyester-based film, comprising a copolymer, (E) a tackifier having a softening point of 100 ° C. or higher, and (F) a crosslinking agent.
The present invention also provides (2) (D) glycidyl obtained by reacting 0.1 to 50 parts by weight of (b) a glycidyl group-containing acrylate monomer with respect to [2] (a) 100 parts by weight of a styrene block copolymer. Film pasting as described in said [1] which mix | blends 10-150 weight part of (E) tackifier and 10-100 weight part of (F) crosslinking agents with respect to 100 weight part of group containing acrylate modified styrene block copolymers. The present invention relates to a bonding adhesive composition.
In addition, the present invention provides [3] (a) Adhesion for film bonding according to the above [1] or [2], wherein the styrene block copolymer is any one or more of SIS, SBS, SEBS, and SEPS. The agent composition.
The present invention also relates to the adhesive composition for film bonding according to any one of [1] to [3], wherein [4] (F) the crosslinking agent is a polyisocyanate containing an aliphatic isocyanate.
In the present invention, [5] The above [1], wherein the polyester film is any one of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene isophthalate, and poly (1,4-cyclohexylenedimethylene terephthalate). Or it is related with the adhesive composition for film bonding in any one of said [4].
The present invention also provides [6] a monomer in which the fluorine-based film contains polyvinyl fluoride (PVF), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), or fluorine having a wetting tension of 35 dyne / cm or less. It is related with the adhesive composition for film bonding in any one of said [1] thru | or said [5] which is a film shape | molded by the copolymer with the monomer which does not contain a fluorine.
Moreover, this invention relates to the adhesive composition for film bonding in any one of said [1] thru | or said [6] containing [7] and (G) antioxidant further.
Moreover, this invention relates to the adhesive composition for film bonding as described in said [7] whose [8] (G) antioxidant is any two or more of phenol type, phosphorus type, and sulfur type antioxidant. .

  By using the adhesive composition for laminating a film of the present invention, a fluorine-based film and a polyester-based film which are excellent in transparency without being clouded even when left at high temperature and high humidity for a long period of time, and have little decrease in adhesive strength. Can be obtained. The obtained film laminate is particularly suitable for various applications such as building material exterior use and home appliance use that require particularly weather resistance.

  The (a) styrene block copolymer used in the present invention includes styrene / isoprene / styrene block copolymer (SIS), styrene / butadiene / styrene block copolymer (SBS), styrene / ethylene / butylene / styrene block copolymer. Polymer (SEBS), Styrene / Ethylene / Propylene / Styrene Copolymer (SEPS), (Ethylene / Propylene) -Styrene Block Copolymer (SEP), Styrene / (Ethylene / Butylene) Block Copolymer (SEB), Styrene -(Ethylene / ethylene / propylene) -styrene block copolymer (SEEPS) and the like, and any one or more of them are used. The physical properties and properties of the styrene block copolymer are not particularly limited because they vary depending on the intended physical properties, but those having MI (melt index, 200 ° C., 5 kg load) of 15 or less are preferable.

  (B) Glycidyl group-containing acrylate monomer used in the present invention is a molecule such as glycidyl acrylate, glycidyl methacrylate, diglycidyl itaconate, 2-methylglycidyl methacrylate, allyl glycidyl ether, styrene-4-glycidyl ether or 4-glycidyl styrene. A monomer having (meth) acrylic acid and a glycidyl group therein is used, and any one or more of these are used. In addition to the glycidyl group-containing acrylate monomer, glycidyl such as 2-hydroxypropyl acrylate, 2-ethylhexyl methacrylate, vinyl acetate, acrylonitrile, styrene, butadiene, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, etc. An acrylic monomer having no group can also be used in combination.

(E) A tackifier having a softening point of 100 ° C. or higher used in the present invention is a tackifier resin used as a tackifier of a styrene block copolymer, specifically petroleum resin, terpene resin, coumarone-indene resin, One or more of rosin resin, epoxy resin, phenol resin, acrylic resin, butyral resin, olefin resin, chlorinated olefin resin, vinyl acetate resin, and modified resins thereof are selected and mixed in an appropriate amount.
Tackifiers generally have a ring and ball softening point measured by ASTM standard E28-58T between about 70 ° C. and 150 ° C., but in the present invention, the softening point of the tackifier is to increase heat resistance. Is 100 ° C. or higher. For example, natural and modified rosins, including rosin resins such as gum rosin, wood rosin, tall oil rosin, distilled rosin, hydrogenated rosin, dimerized rosin, resin acid salt, polymerized rosin, wood rosin glycerol Glycerol and pentaerythritol esters of natural and modified rosins, including esters, glycerol esters of hydrogenated rosins, glycerol esters of polymerized rosins, pentaerythritol esters of hydrogenated rosins, and phenol-modified pentaerythritol esters of rosins. Phenol modifications including terpene resins as copolymers and terpolymers of natural terpenes including styrene / terpenes and α-methylstyrene / terpenes, bicyclic terpenes of polyterpene resins and resin products obtained from the condensation of phenol in acidic media Terpene resins and their hydrogenated derivatives. Aliphatic petroleum hydrocarbon resins, aromatic petroleum hydrocarbon resins and hydrogenated derivatives thereof, alicyclic petroleum hydrocarbon resins and hydrogenated derivatives thereof. Also include cyclic or acyclic C ₅ resins and aromatic modified acyclic or cyclic resins.

  The crosslinking agent (F) used in the present invention is preferably a polyisocyanate containing an aliphatic isocyanate. Specifically, aliphatic diisocyanates such as hexamethylene diisocyanate (HDI), trimethylhexamethylene diisocyanate (TMDI), lysine diisocyanate (LDI), or adducts obtained by reacting aliphatic diisocyanates with divalent or trivalent polyhydric alcohols. Buret, uretidione isocyanurate and the like. One or more combinations can be selected and used depending on the various physical properties.

  (C) used to synthesize (D) glycidyl group-containing acrylate-modified styrene block copolymer used in the present invention by polymerizing (a) styrene block copolymer and (b) glycidyl group-containing acrylate monomer (c) polymerization initiation Examples of the agent include benzoyl peroxide, bis (2,4-dichlorobenzoyl) peroxide, di-t-butyl peroxide, 2,5-dimethylperoxyhexane, t-butylperbenzoate, and t-butylperoxy. Examples thereof include organic peroxides such as isopropyl carbonate, inorganic peroxides such as hydrogen peroxide, persulfates such as ammonium sulfate, and diazo compounds such as azobisisobutyronitrile. In addition, (D) a glycidyl group-containing acrylate-modified styrene block copolymer can be obtained by reacting a styrene block copolymer with a glycidyl group-containing acrylate monomer in advance using ultraviolet rays, electron beams, or the like.

  (B) The compounding quantity of a glycidyl group containing acrylate monomer is 0.1-50 weight part with respect to 100 weight part of (a) styrene block copolymers, Preferably it is 1-20 weight part. If the blending amount of (b) is less than 0.1 parts by weight, the desired heat resistance cannot be obtained, and if it exceeds 50 parts by weight, the elastic modulus after curing increases and the adhesion to the fluorine-based film decreases.

  (E) The compounding quantity of a tackifier is 10-150 weight part with respect to 100 weight part of (D) glycidyl group containing acrylate modified styrene block copolymers, Preferably it is 30-100 weight part. When the blending amount of (E) is less than 10 parts by weight, sufficient tack is not exhibited, and particularly the adhesiveness to the polyester film is lowered. When it exceeds 150 parts by weight, the elastic modulus after curing becomes high and the fluorine-based film. Adhesiveness to is reduced. The softening point (E) must have a softening point of 100 ° C. or higher because it is necessary to impart heat resistance.

  (F) The compounding quantity of a crosslinking agent is 10-100 weight part with respect to 100 weight part of (D) glycidyl group containing acrylate modified styrene block copolymers, Preferably it is 15-50 weight part. If the blending amount of (F) is less than 10 parts by weight, sufficient heat resistance cannot be obtained because the crosslinking density after curing is low. Moreover, when it exceeds 100 weight part, the elasticity modulus after hardening will become high and the adhesiveness to a fluorine-type film will fall.

  (C) The compounding quantity of a polymerization initiator is 0.1-3.0 weight part with respect to a total of 100 weight part of (a) styrene block copolymer and (b) glycidyl group containing acrylate monomer. When the blending amount of (c) is less than 0.1 parts by weight, the glycidyl group-containing acrylate monomer does not sufficiently react, and when it exceeds 3.0 parts by weight, the storage stability of the adhesive is lowered, and problems such as gelation occur. cause.

  The polyester film used in the present invention is a crystalline linear saturated polyester synthesized from an aromatic dibasic acid or an ester-forming derivative thereof and a diol or an ester-forming derivative thereof. Specific examples of the polyester film include polyethylene terephthalate, polyethylene isophthalate, polybutylene terephthalate, poly (1,4-cyclohexylenedimethylene terephthalate), and the like.

Examples of the fluorine-based film used in the present invention or a film formed by a copolymer of a fluorine-containing monomer having a wetting tension of 35 dyne / cm or less and a monomer not containing fluorine include polyvinyl fluoride (PVF) and polytetrafluoroethylene. Fluorine films such as (PTFE) and polyvinylidene fluoride (PVDF), and films formed from a copolymer of a monomer containing fluorine and a monomer not containing fluorine, such as a copolymer of tetrafluoroethylene and ethylene (ETFE) Is mentioned. The adhesive composition for laminating a film of the present invention can be suitably used for a film having a wetting tension of 35 dyne / cm or less, such as a polyolefin film composed of polypropylene, polyethylene or the like.
The wetting tension is a surface tension of a mixed solution that is determined to wet a sample in 2 seconds after applying a series of mixed solutions having different surface tensions to the sample surface, and can be measured according to JIS K6768. 22.6 to 73 dyne / cm (mN / m) can be measured by using a commercially available liquid mixture for wet tension test.

  Examples of (G) antioxidants include phenolic antioxidants, phosphorus antioxidants, and sulfur-based antioxidants. In the present invention, it is preferable to use any two or more of these in combination. When used in combination, problems such as a decrease in durability characteristics and a decrease in storage stability of the adhesive can be further improved.

  (G) As antioxidant, a phenolic antioxidant, phosphorus antioxidant, and sulfur type antioxidant are mentioned as mentioned above. Specifically, the phenolic antioxidant includes 2,6-di-t-butylphenol derivatives, 2-methyl-6-t-butylphenol derivatives, octadecyl 3 (3,5-dibutyl-4-bitoxyphenyl) propionate, 4,4-butylidene-bis (6-tert-butyl-m-cresol), pentaerythrityl tetrakis {3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate}, 2 {1- (2-hydroxy-3,5-di-t-pentylphenyl) -ethyl} -4,6 di-t-pentylphenyl acrylate. Phosphorous antioxidants include tris (2,4-di-t-butylphenyl) phosphite, cyclic neopentanetetrabis (2,4-di-t-butylphenyl phosphite, distearyl pentaerythritol diphosphite, Sodium dihydrogen phosphate, etc. Sulfur-based antioxidants include 3,3-thiobispropionic acid didodecyl ester, 3,3-thiobispropionic acid dioctadecyl ester, pentaerythritol tetrakis- (3-laurylpropionate) ) And the like.

  The adhesive composition for laminating a film of the present invention is obtained by crosslinking and compatibilizing each other by heating and stirring a styrene block copolymer and a glycidyl group-containing acrylate monomer in the presence of a polymerization initiator. It is considered that a unique effect can be obtained by dissolving or dispersing a resin, a crosslinking agent, and an antioxidant in a solvent. The heating temperature and heating time at the time of heating and stirring vary depending on the initiator to be used. For example, if the reaction is carried out in a solution of an organic solvent such as toluene at 70 to 110 ° C. for 1 to 24 hours under nitrogen substitution, for example. Good. Further, desired properties can be obtained by dissolving or dispersing the tackifier, the crosslinking agent and the antioxidant after this reaction.

  In addition, a colorant, a catalyst, a filler, and the like can be added as necessary.

  As described above, the present invention is a film laminating adhesive composition that can be adhered to a polyester film and a film having a low wetting tension such as a fluorine film and difficult to adhere to. It is particularly suitable for film lamination where particularly weather resistance is required for the application.

  In addition to this, the adhesive composition for laminating a film of the present invention is not limited to a polyester film, but an adhesive between a film mainly composed of a polyolefin resin, an ABS resin, a polystyrene resin and a fluorine film, and fluorine. It can also be used for bonding the resin films without using a system film.

  Next, the present invention will be described more specifically with reference to examples and comparative examples. The results of these specific examples are shown in Table 1, but the present invention is not limited to these examples. In the text, “parts” means parts by weight.

Example 1
In a flask purged with nitrogen, 100 parts of a styrene / butadiene / styrene block copolymer (Clayton D-1102JS; manufactured by Kraton Polymer Japan Co., Ltd.) and 10 parts of glycidyl methacrylate were heated and stirred at 80 ° C. in 300 parts of toluene and dissolved. Then, 0.5 part of benzoyl peroxide was added as a polymerization initiator, and the mixture was heated and stirred. The flask was heated and stirred for 3 hours while maintaining at 80 ± 2 ° C., allowed to cool to about 40 ° C., and then 200 parts of cyclohexane, tackifier (neopolymer 120, softening point 120 ° C .; manufactured by Nippon Oil Corporation) 80 1 part of phenolic antioxidant (Tominox TT; manufactured by API Corporation) and 1 part of phosphorus antioxidant (Tomifos 202; manufactured by API Corporation) were added and mixed with stirring for about 1 hour. Immediately before bonding, 50 parts of aliphatic polyisocyanate (Coronate HL; manufactured by Nippon Polyurethane Industry Co., Ltd.) was mixed to obtain an adhesive composition (I) for film bonding.

(Example 2)
100 parts of styrene / isoprene / styrene block copolymer (Quintac 3421; manufactured by Nippon Zeon Co., Ltd.) and 10 parts of glycidyl methacrylate are added to 300 parts of toluene in the same manner as in Example 1 in a flask purged with nitrogen. After heating and stirring at 0 ° C. for dissolution, 0.5 part of benzoyl peroxide was added as a polymerization initiator, followed by heating and stirring. The flask was heated and stirred for 3 hours while maintaining at 80 ± 2 ° C. and allowed to cool to about 40 ° C., then 200 parts of cyclohexane, 80 parts of tackifier (neopolymer 120), phenolic antioxidant (Tominox TT) 1 1 part of a phosphorus antioxidant (Tomifos 202) was added and mixed with stirring for about 1 hour. Immediately before the lamination, 50 parts of an aliphatic polyisocyanate (Coronate HL) was mixed to obtain an adhesive composition (II) for film lamination.

(Comparative Example 1)
In the same manner as in Example 1, 100 parts of a styrene / butadiene / styrene block copolymer (Clayton D-1102JS) and 10 parts of 2-ethylhexyl methacrylate were heated at 80 ° C. to 300 parts of toluene in a flask purged with nitrogen. After stirring and dissolving, 0.5 part of benzoyl peroxide was added as a polymerization initiator, followed by heating and stirring. The flask was heated and stirred for 3 hours while being kept at 80 ± 2 ° C., allowed to cool to about 40 ° C., then 200 parts of cyclohexane, 80 parts of a tackifier (neopolymer 120), 1 phenolic antioxidant (Tominox TT) 1 1 part of a phosphorus antioxidant (Tomifos 202) was added and mixed with stirring for about 1 hour. Immediately before bonding, 50 parts of an aliphatic polyisocyanate (Coronate HL) was mixed to obtain an adhesive (III).

(Comparative Example 2)
In the same manner as in Example 1, 100 parts of a styrene / butadiene / styrene block copolymer (Clayton D-1102JS) and 10 parts of glycidyl methacrylate were heated and stirred at 802 ° C. in 300 parts of toluene. After dissolution, 0.5 part of benzoyl peroxide was added as a polymerization initiator and heated and stirred. The flask was heated and stirred for 3 hours while being kept at 80 ± 2 ° C., allowed to cool to about 40 ° C., and then 200 parts of cyclohexane, 80 parts of a tackifier (superester A-75, softening point 75 ° C .; manufactured by Arakawa Chemical Industries) Then, 1 part of a phenolic antioxidant (Tominox TT) and 1 part of a phosphorus antioxidant (Tomifos 202) were added and mixed with stirring for about 1 hour. Immediately before bonding, 50 parts of an aliphatic polyisocyanate (Coronate HL) was mixed to obtain an adhesive (IV).

(Comparative Example 3)
After dissolving 100 parts of styrene / butadiene / styrene block copolymer (Clayton D-1102JS) and 10 parts of acrylic polymer (Mitsubishi Rayon Co., Ltd., Dianar BR-106) in 300 parts of toluene, 200 parts of cyclohexane, adhesive 80 parts of an imparting agent (neopolymer 120), 1 part of a phenolic antioxidant (Tominox TT) and 1 part of a phosphorus antioxidant (Tomifos 202) were added and mixed with stirring for about 1 hour. Immediately before the lamination, 50 parts of an aliphatic polyisocyanate (Coronate HL) was mixed to obtain an adhesive composition (V) for film lamination.

(Comparative Example 4)
In Example 1, instead of 50 parts of aliphatic polyisocyanate (Coronate HL), a film was prepared in the same manner as in Example 1 except that 20 parts of aminopropyltriethoxysilane (KBE903; manufactured by Shin-Etsu Silicone Co., Ltd.) was used. A bonding adhesive composition (VI) was obtained.

  Using the adhesives obtained in Examples 1 and 2 and Comparative Examples 1 to 4, test pieces were prepared as follows, and peel adhesion strength measurement and heat resistant creep measurement were performed.

(1) Test piece preparation method The obtained adhesive was applied on a polyester film (PET, thickness 50 μm) using a coating machine (application amount: 100 g / m ² -wet) and set to 80 ° C. The dried oven was dried for 2 minutes. A polyester film with an adhesive and a fluorine film (PVF, thickness 25 μm) were passed through a laminator (lamination speed: 2 m / min) heated to 60 ° C. to obtain a bonded adhesive.

(2) Initial peel adhesion strength The bonded product was cured in a 23 ° C./50% RH atmosphere for 1 day, and the 180 ° peel adhesion strength was measured with a tensile tester in a 20 ° C. atmosphere.

(3) Peeling adhesion strength after high temperature and high humidity After the adhesive product is cured for one day in an atmosphere of 20 ° C and 65% RH and left in a thermostatic bath set to 85 ° C and 85% RH for 1000 hours, After leaving in a 65% RH atmosphere for one day, 180 ° peel adhesion strength was measured with a tensile tester in the same atmosphere.
The test results are summarized in Table 1.

Comparative Example 1 is a case where an acrylate-modified styrene block copolymer was used instead of the (D) glycidyl group-containing acrylate-modified styrene block copolymer used in the present invention, and the initial peel adhesion strength was the same as in the examples. However, since there was no reactive group with the crosslinking agent, the peel adhesion strength after high temperature and high humidity was greatly reduced. Moreover, the comparative example 2 is a case where the tackifier whose softening point is 100 degrees C or less is used, and the peeling adhesive strength after high temperature, high humidity fell remarkably.
Comparative Example 3 is a case where a styrene block copolymer and an acrylic polymer were blended. The acrylic polymer and the styrene block copolymer were not mixed uniformly, the appearance was poor, and the initial high-temperature, high-humidity peeling adhesive strength was low. . In Comparative Example 4, aminopropyltriethoxysilane was blended in place of the aliphatic polyisocyanate, but the peel adhesion strength was the same as in the Examples, but the high temperature and high humidity test adhesive was cloudy and transmitted through the adhesive. I couldn't see what I did.
On the other hand, the adhesive product using the adhesive composition for laminating a film of the present invention has an initial peel strength and a high-temperature high-humidity peel strength that are comparable, and the adhesive product may become cloudy even after a high-temperature moisture resistance test. I could see things through the adhesive. As described above, in the present invention, even when left for a long period of time under high temperature and high humidity, there is no cloudiness and excellent transparency, and there is little decrease in adhesive strength. An adhesive composition used for bonding can be provided.

(Examples 3 to 5)
In order to see the effect of the antioxidant used in Example 1, only the blending of the antioxidant of Example 1 was changed and blended as shown in Table 2 to obtain a bonded adhesive product. The initial peel adhesive strength and the high temperature and high humidity peel adhesive strength were measured, and the results are summarized in Table 2.

  From Table 2, it is preferable to use a combination of two or more types of antioxidants, either phenolic or phosphorous alone, in order to maintain the peel adhesion strength after high temperature and high humidity.

Claims (8)

(D) a glycidyl group-containing acrylate-modified styrene block copolymer obtained by reacting (a) a styrene block copolymer with (b) a glycidyl group-containing acrylate monomer in the presence of a polymerization initiator; ) An adhesive composition for laminating a fluorine-based film and a polyester-based film, comprising a tackifier having a softening point of 100 ° C. or higher and (F) a crosslinking agent. (A) A glycidyl group-containing acrylate-modified styrene block copolymer obtained by reacting 0.1 to 50 parts by weight of (b) a glycidyl group-containing acrylate monomer with respect to 100 parts by weight of a styrene block copolymer. The adhesive composition for film bonding according to claim 1, wherein 10 to 150 parts by weight of (E) a tackifier and 10 to 100 parts by weight of (F) a crosslinking agent are blended with respect to 100 parts by weight. (A) The styrene block copolymer is any one or more of SIS, SBS, SEBS, and SEPS. The adhesive composition for film bonding according to claim 1 or 2. The adhesive composition for film lamination according to any one of claims 1 to 3, wherein (F) the crosslinking agent is a polyisocyanate containing an aliphatic isocyanate. The polyester film is any one of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene isophthalate, and poly (1,4-cyclohexylenedimethylene terephthalate). Adhesive composition for film lamination. Copolymer of a fluorine-containing film of polyvinyl fluoride (PVF), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), or a monomer containing fluorine having a wetting tension of 35 dyne / cm or less and a monomer not containing fluorine The adhesive composition for film laminating according to any one of claims 1 to 5, wherein the adhesive composition is a film formed by the method. Furthermore, (G) adhesive composition for film bonding in any one of Claim 1 thru | or 6 containing antioxidant. (G) Adhesive composition for film bonding of Claim 7 whose antioxidant is any two or more of a phenol type, phosphorus type, and sulfur type antioxidant.