JPH09316422A - Adhesive composition for laminating and method for producing laminated film using the same - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To use an adhesive composition for lamination, which can complete a curing reaction at room temperature in a short time, and which is excellent in productivity and workability, and an adhesive composition for lamination. The present invention provides a method for manufacturing a laminated film. SOLUTION: A laminate comprising an organic compound (A) having a functional group capable of reacting with an isocyanate group, an organic isocyanate compound (B), a catalyst (C), and optionally a coupling agent (D). It is an adhesive composition. This organic compound (A) is a polyisocyanate component (a)
And an isocyanate group-reactive component (b) are reacted with each other. Further, it is a method for producing a laminated film using the adhesive composition for laminating.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an adhesive composition suitable for laminating films, and a method for producing a laminated film using the same.

[0002]

2. Description of the Related Art Recently, a composite flexible package has been used as a packaging method because of its strength, product protection, workability at the time of packaging, advertising effect by packaging, large amount of plastic material, and reduction of packaging cost by inexpensive supply. Has developed significantly. As an adhesive used for laminating such a film, a hydroxyl group is generally used because of its excellent adhesive performance, cold resistance, heat resistance, wide range of application to various plastics, base materials such as metal foils, etc. Two-component polyurethane adhesives composed of a main agent having an active hydrogen group and a curing agent having an isocyanate group have become the mainstream.

[0003]

However, current two-component polyurethane-based adhesives for laminates require a curing accelerating process called so-called aging because the curing reaction of the adhesives after bonding is very slow. Specifically, it becomes necessary to cure the adhesive by storing the laminated film in a greenhouse at 35 to 60 ° C. for about 3 to 5 days and aging it. At this time, the degree of curing of the adhesive changes depending on the aging conditions, which may affect the adhesive strength of the laminate film.If the aging is insufficient, delamination (layer May cause peeling). Especially in the case of an aliphatic polyurethane adhesive, this curing reaction requires a considerably long time. Therefore, such an aging step is an indispensable step in the dry lamination process, and a capital investment for installing a greenhouse for aging and a utility for heating after that are required. The present invention provides an adhesive composition for laminating, which is capable of completing a curing reaction at room temperature in a short time and is excellent in productivity and workability, and a laminated film using the adhesive composition for laminating. It is intended to provide a manufacturing method.

[0004]

Means for Solving the Problems As a result of intensive studies conducted by the present inventors to solve such conventional problems, as a result, an organic compound (A) having a functional group capable of reacting with an isocyanate group and an organic isocyanate compound (B) and catalyst (C)
It was found that an adhesive composition consisting of a coupling agent (D) and, if necessary, can complete a curing reaction at room temperature in a short time in bonding films to each other, and to complete the present invention. I arrived.

That is, the present invention relates to a laminating adhesive composition comprising an organic compound (A) having a functional group capable of reacting with an isocyanate group, an organic isocyanate compound (B), and a catalyst (C), The above-mentioned organic compound (A) having a functional group capable of reacting with an isocyanate group is an organic compound obtained by reacting a polyisocyanate component (a) with an isocyanate group-reactive component (b). It is the adhesive composition for lamination.

The present invention relates to an adhesive for laminating comprising an organic compound (A) having a functional group capable of reacting with an isocyanate group, an organic isocyanate compound (B), a catalyst (C) and a coupling agent (D). An agent composition,
The above-mentioned organic compound (A) having a functional group capable of reacting with an isocyanate group is an organic compound obtained by reacting a polyisocyanate component (a) with an isocyanate group-reactive component (b). It is the adhesive composition for lamination.

The present invention is the adhesive composition for laminating, wherein the isocyanate group-reactive component (b) contains a rosin polyol (b1).

Further, the present invention is characterized in that each of the above-mentioned adhesive compositions for laminating is applied to the first film and dried, and then the second film is laminated thereon and aged at room temperature. It is a method of manufacturing a laminated film.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION First, the organic compound (A) having a functional group capable of reacting with an isocyanate group, which is an essential component in the present invention, will be described. This organic compound (A)
Is obtained by reacting the polyisocyanate component (a) with the isocyanate group-reactive component (b) in a ratio of 0.50 to 0.98 of the equivalent amount of the isocyanate group / the equivalent amount of the functional group capable of reacting with the isocyanate group. The resulting compound is a compound having a functional group capable of reacting with an isocyanate group.
The number average molecular weight of this organic compound (A) is 3000 to 60.
000, particularly preferably 10,000 to 40,000.

The organic compound (A) having a functional group capable of reacting with an isocyanate group is a molten state, a bulk state, or, if necessary, an inert solvent commonly used in the polyurethane industry, for example, an aromatic solvent such as toluene or xylene. Hydrocarbon solvents, ethyl acetate, ester solvents such as butyl acetate, methyl ethyl ketone, ketone solvents such as cyclohexanone, ethylene glycol ethyl ether acetate, propylene glycol methyl ether acetate,
Use one or more of glycol ether ester solvents such as ethyl-3-ethoxypropionate, ether solvents such as tetrahydrofuran and dioxane, polar solvents such as dimethylformamide, dimethylacetamide, N-methylpyrrolidone and furfural. Then, the components can be uniformly mixed and reacted at preferably 100 ° C. or lower under the above-mentioned compounding condition range. As the reaction device, any device may be used as long as the above reaction can be achieved, and examples thereof include a reaction kneader equipped with a stirring device, a kneader, and a mixing and kneading device such as a uniaxial or multiaxial extrusion reactor. In order to accelerate the reaction, a metal catalyst commonly used in the production of polyurethane or polyurea such as dibutyltin dilaurate or a tertiary amine catalyst such as triethylamine may be used as the catalyst.

As the polyisocyanate component (a),
In addition to one or more polyisocyanate monomers, polyisocyanate compounds containing a polymer thereof may be mentioned. For example, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, xylene-1,4-diisocyanate, xylene-1,3-
Diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, 4,4'-diphenyl ether diisocyanate, 2-nitrodiphenyl-4,4'-diisocyanate, 2,2'-diphenylpropane-4,4 ' -Diisocyanate, 3,3'-dimethyldiphenylmethane-
4,4'-diisocyanate, 4,4'-diphenylpropane diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, naphthylene-
1,4-diisocyanate, naphthylene-1,5-diisocyanate, 3,3′-dimethoxydiphenyl-4,
Aromatic diisocyanates such as 4'-diisocyanate,
Aliphatic diisocyanates such as tetramethylene diisocyanate, hexamethylene diisocyanate (hereinafter abbreviated as HDI), lysine diisocyanate, isophorone diisocyanate (hereinafter abbreviated as IPDI), hydrogenated tolylene diisocyanate, hydrogenated xylene diisocyanate, hydrogenated diphenylmethane Diisocyanate, diisocyanate such as alicyclic diisocyanate such as tetramethylxylene diisocyanate, and a biuret body, dimer body, trimer body, dimer trimmer body, polymer body such as uretonimine modified body of the diisocyanate, bifunctional or higher functional polyol, etc. Adducts of polyisocyanates obtained by reaction with the above-mentioned diisocyanates or their polymeric forms are suitable.

The isocyanate group-reactive component (b) is a compound containing a functional group capable of reacting with an isocyanate group, and preferably a compound containing an active hydrogen group capable of reacting with an isocyanate group. Specifically, in addition to water, polyol, polyamine containing amino groups and the like, urea resin, melamine resin, polyester resin, rosin resin, acrylic resin,
1 or 2 selected from polyvinyl alcohol
Those containing one or more species are preferable.

Examples of the polyol include polyester polyols, polyester amide polyols, polyether polyols, polyether ester polyols, polycarbonate polyols, rosin polyols (b1) and other polyols known in the polyurethane industry. Specifically, for example, dicarboxylic acids such as known succinic acid, adipic acid, sebacic acid, azelaic acid, terephthalic acid, isophthalic acid, hexahydroterephthalic acid, hexahydroisophthalic acid, their acid esters, acid anhydrides, etc. , Ethylene glycol (hereinafter EG
Abbreviated), 1,3-propylene glycol, 1,2
-Propylene glycol (hereinafter abbreviated as 1,2-PG), 1,4-butylene glycol, 1,5-pentane glycol, 1,6-hexane glycol, 3-methyl-1,5-pentane glycol, 2-butyl 2-Ethyl-1,3-propanediol, neopentyl glycol (hereinafter abbreviated as NPG), 1,8-octane glycol, 1,9-nonanediol, diethylene glycol, cyclohexane-1,4-diol, cyclohexane-1 , 4-dimethanol, dimer acid diol, trimethylolpropane, glycerin, hexanetriol, glycol or triol such as ethylene oxide or propylene oxide adduct of bisphenol A, or hexamethylenediamine, N,
In dehydration condensation reaction with N, N ′, N′-tetrakis (2-hydroxypropyl) ethylenediamine, xylenediamine, isophoronediamine, monoethanolamine, isopropanoltriamine, etc. diamine, triamine or aminoalcohol alone, or a mixture thereof. The obtained polyester polyol and polyester amide polyol are mentioned. Further, there are lactone-based polyester polyols obtained by ring-opening polymerization of cyclic ester (ie, lactone) monomers such as ε-caprolactone, alkyl-substituted ε-caprolactone, δ-valerolactone, and alkyl-substituted δ-valerolactone.

Examples of the polyether polyol include polyethylene glycol, polypropylene ether polyol, polytetramethylene ether polyol and the like. Examples of the polyether / ester polyol include those produced from these polyether polyols and the above-mentioned dicarboxylic acids, acid anhydrides and the like. Polycarbonate polyols include, for example, hexane glycol, 3-methyl-1,5-pentanediol,
It is obtained from the reaction of 1,4-cyclohexanedimethanol and the like with diethyl carbonate, diphenyl carbonate and the like, and specific products include Nippon Polyurethane Industry Co., Ltd.'s Nipolan 980, Nipolan 981 and the like.

The monomolecular glycols or triols mentioned as the raw materials for the polyester polyols, that is, EG, 1,3-propylene glycol and 1,2-
PG, 1,4-butylene glycol, 1,5-pentane glycol, 1,6-hexane glycol, 3-methyl-1,5-pentane glycol, NPG, 1,8-octane glycol, 1,9-nonanediol, Diethylene glycol, cyclohexane-1,4-diol, cyclohexane-1,4-dimethanol, diol dimer acid, trimethylolpropane, glycerin, hexanetriol, quadrol or ethylene oxide or propylene oxide adduct of bisphenol A is also used as the polyol. It can be used in the invention.

The amino group-containing polyamine includes
Examples include monomolecular diamines such as hexamethylenediamine, ethylenediamine, and isophoronediamine, triamines, aromatic diamines, and polyether polyamines in which the end of the polyether is an amino group. In addition, urea resin, melamine resin, epoxy resin, polyester resin,
Acrylic resins, polyvinyl alcohols and the like are generally known in the polyurethane industry, and as long as they contain one or more, preferably two or more functional groups capable of reacting with an isocyanate group such as an active hydrogen group, isocyanate group reactivity is obtained. It can be used as all or part of component (b).

The molecular weight of these isocyanate group-reactive components (b) is preferably 18 to 20,000, and particularly preferably water and a molecular weight of 400 to 10,000. If the molecular weight is too large, the introduction amount of urethane groups and the like decreases, and the toughness and strong cohesive force of the organic compound having a functional group capable of reacting with an isocyanate group decrease, which is not preferable. If the molecular weight is too small, the organic compound having a functional group capable of reacting with an isocyanate group tends to become brittle, which is not preferable. This molecular weight needs to be appropriately selected depending on the application, and it is preferable to use a low molecular weight one in order to enhance heat resistance and cohesive energy.

Considering the adhesive performance with the base film, aromatic polyester polyols using terephthalic acid, isophthalic acid, etc. and polyester polyols using adipic acid are preferable.

In consideration of the adhesive performance, it is more preferable to use the rosin polyol (b1) as a part or all of the isocyanate group-reactive component (b). The rosin polyol (b1) has a functional group capable of reacting with an isocyanate group, and is a rosin ester obtained from rosin and a polyhydric alcohol (JP-A-2-155).
1978) and rosin esters obtained from an epoxy compound and rosin (see Japanese Patent Application Laid-Open No. 5-155972). Further, a polyether having a rosin skeleton is also preferable. Among these, in particular, a rosin ester consisting of one molecule of diepoxy compound and two molecules of hydrogenated, disproportionated and purified rosin (see Japanese Patent Laid-Open No. 263059/1993) is an organic compound having a functional group capable of reacting with an isocyanate group. It is preferable because it can be easily introduced into the molecule and the molecular weight of this organic compound produced can be easily controlled.
Specific examples of the rosin polyol (b1) include KE-601 and KE-615 manufactured by Arakawa Chemical Industry Co., Ltd.
3, KE-622, KE-623, KE-624 and the like.

As the organic isocyanate compound (B) which is an essential component in the present invention, the compounds mentioned above as the polyisocyanate component (a) can be used. Specifically, they are manufactured by Nippon Polyurethane Industry Co., Ltd. Coronate L, Coronate 3041, Coronate HL,
Coronate HX and the like can be mentioned. The compounding amount of the organic isocyanate compound (B) is preferably 1 to 30 parts by weight, particularly 3 to 15 parts by weight in terms of solid content, relative to 100 parts by weight of the solid content of the organic compound (A).

Next, the catalyst (C) which is an essential component in the present invention will be described. The catalyst (C) includes those generally known as transesterification catalysts, urethanization catalysts, blocked isocyanate dissociation catalysts, isocyanurate formation catalysts, and the like, and specifically, dibutyltin dilaurate, stannas octoate, etc. Tin catalyst, triethylenediamine, triethylamine, N, N, N ', N'-tetramethylpropylenediamine, N, N, N', N'-
Tetrakis (2-hydroxypropyl) ethylenediamine, N-methylmorpholine, 1,2-dimethylimidazole, 1,5-diaza-bicyclo (4,3,0) nonene-5,1,8-diazabicyclo (5,4,0) ) -Undecene-7 (hereinafter abbreviated as DBU), borane salts of these amine-based catalysts, DBU phenol salts, DBU octylates, various amine salt-based catalysts such as DBU carbonates, magnesium naphthenate, lead naphthenate, CH. Carboxylates such as ₃ COOK, trialkylphosphines such as triethylphosphine and tribenzylphosphine, CH ₃ O
Examples thereof include alkoxides such as Na and zinc-based organometallic catalysts. Of these, DBU and various acid salts of DBU can be preferably used in view of the catalytic effect and the stability of the adhesive composition after addition. The curing rate largely depends on the type and amount of the catalyst to be added, but by appropriately selecting these, a practical curing rate can be obtained even in a temperature range near room temperature, preferably 15 to 35 ° C. It becomes possible. However, for example, when the amount of the catalyst added is less than 0.01% by weight with respect to the solid content of the organic compound (A) having a functional group capable of reacting with an isocyanate group, the effect of promoting the curing reaction due to the addition of the catalyst is less likely to appear. Also, 5.00
If the amount is more than 10% by weight, the curing speed is too fast to make coating difficult, and there is a possibility that hydrolysis of the adhesive after curing may be accelerated, which is not preferable. Therefore, the amount of the catalyst added to the solid content of the organic compound (A) having a functional group capable of reacting with an isocyanate group is 0.0
1 to 5.00% by weight, particularly 0.05 to 2.00% by weight is desirable.

Examples of the coupling agent (D) that can be used in the present invention include silane coupling agents, titanate coupling agents, aluminum coupling agents and the like. The amount of the coupling agent added to the solid content of 100 parts by weight of the organic compound (A) having a functional group capable of reacting with an isocyanate group is 0.05 to 10.00.
Parts by weight are preferred. More preferred is 0.1-5.
It is 00 parts by weight. The addition amount shown here is calculated in consideration of the coating area of the base film of the coupling agent, the coating efficiency, the adhesive performance and the like.

As the silane coupling agent, vinylsilane compounds such as γ-methacryloxypropyltrimethoxysilane and vinyltriethoxysilane, and β- (3,3
4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane and other epoxysilane compounds, γ-aminopropyltriethoxysilane, N-β-aminoethyl-γ-aminopropylmethyldimethoxysilane and the like Aminosilane compounds and mercaptosilane compounds such as γ-mercaptopropyltrimethoxysilane are preferably used.

Examples of titanate coupling agents include isopropyl triisostearoyl titanate, isopropyl tridodecylbenzenesulfonyl titanate, isopropyl tris (dioctyl pyrophosphate) titanate, tetraisopropyl bis (dioctyl phosphite) titanate, tetraoctyl bis (ditridecyl phosphite). Phyto) titanate, tetra (2,2-diallyloxymethyl-1-butyl) bis (ditridecyl phosphite) titanate, bis (dioctyl pyrophosphate) oxyacetate titanate, bis (dioctyl pyrophosphate) ethylene titanate, isopropyl trioctanoyl Titanate, isopropyldimethacrylisostearoyl titanate, isopropylisostearoyldiac Ruchitaneto, isopropyl tri (dioctyl phosphate) titanate, isopropyl tricumylphenyl titanate, isopropyl tri (N
-Amidoethylaminoethyl) titanate, dicumylphenyloxyacetate titanate, diisostearoylethylene titanate, and the like. Specifically, Aplanator KR TTS, KR 46 manufactured by Ajinomoto Co., Inc.
B, KR 55, KR41B, KR 38S, KR 1
38S, KR 238S, KR 338X, KR 1
2, KR 44, KR 9SA, KR 34S and the like can be preferably used.

As the aluminum-based coupling agent,
Examples thereof include acetoalkoxyaluminum diisopropylate, and as a commercial product, Planeact AL-M manufactured by Ajinomoto Co., Inc. can be preferably used.

Of the above coupling agents, epoxy silane compounds, amino silane compounds, phosphoric acid titanates, etc. are considered in view of improving the adhesive strength to widely used polyethylene terephthalate film, aluminum film, nylon film, polyolefin film and the like. It is suitable. Of these, particularly preferred is a case where an epoxysilane compound is used as the coupling agent (D) and DBU and various acid salts of DBU are used in combination as the catalyst (C).

The film used for laminating in the present invention includes stretched polypropylene, unstretched polypropylene (hereinafter abbreviated as CPP), polyester (hereinafter abbreviated as PET), nylon (hereinafter abbreviated as NY), low density polyethylene. , High-density polyethylene, ethylene-vinyl acetate copolymer, polyvinyl alcohol, ethylene-vinyl alcohol copolymer (hereinafter abbreviated as EVOH), polystyrene, polycarbonate, polyvinylidene chloride, polyvinyl chloride and other plastic films, Al, Cu Examples thereof include metal foils, papers, and the like, and films obtained by applying a polymer coating to these. These films are preferably subjected to an appropriate surface treatment such as corona discharge treatment before laminating in order to improve the adhesive force. In addition, the polymer coated film is
Since problems such as bubble generation and adhesive strength reduction may occur, it is necessary to consider in advance the type of coated polymer, the coating amount, the surface characteristics, and the like.

Next, the film laminating method will be described. The adhesive composition for lamination of the present invention can be used by known lamination methods such as dry lamination, hot melt lamination, and extrusion lamination. The laminated film can complete the curing reaction by aging at room temperature (preferably 15 to 35 ° C.) for a fixed time (preferably within 24 hours). By such a method of the present invention, not only a film in which two films are laminated but also a film in which three or more films are laminated can be manufactured.

[0029]

EXAMPLES Next, examples of the present invention will be described in detail, but the present invention is not construed as being limited to these examples. Unless otherwise specified, parts and% in Synthesis Examples, Examples and Comparative Examples mean "parts by weight" and "% by weight", respectively.

Having a functional group capable of reacting with an isocyanate group
Synthesis of Organic Compound Synthesis Example 1 100 parts of HDI and dimethyl terephthalate / in a reactor equipped with a stirrer, a thermometer, a nitrogen seal tube and a condenser.
Sebacic acid = 1/1 (molar ratio) and EG / NPG = 3
1323 parts of polyester polyol having a number average molecular weight of 2,000 synthesized from / 7 (molar ratio), and ethyl acetate 142
3 parts were added and it was made to react at 75 degreeC. 4 hours later, FT-I
After confirming that the absorption peak of the isocyanate group disappeared by R, the reaction was terminated, and a polyurethane resin (having an active hydrogen group) (hereinafter the same) was obtained. This is designated as PU-A.

Synthesis Example 2 In a reactor equipped with a stirrer, a thermometer, a nitrogen seal tube and a condenser, 100 parts of HDI, isophthalic acid / azelaic acid = 1/1 (molar ratio) and 3-methyl-1,5-. 1293 parts of a polyester polyol having a number average molecular weight of 2000 (hereinafter abbreviated as polyol A) synthesized from pentane glycol / 1,2-PG = 8/2 (molar ratio) and 1393 parts of ethyl acetate were added and reacted at 75 ° C. It was After 4 hours, it was confirmed by FT-IR that the absorption peak of the isocyanate group had disappeared, the reaction was terminated, and a polyurethane resin was obtained. This is designated as PU-B.

Synthesis Example 3 In a reactor equipped with a stirrer, a thermometer, a nitrogen seal tube and a condenser, 100 parts of HDI, 1035 parts of polyol A, and rosin-containing polyol KE-601 (manufactured by Arakawa Chemical Industry Co., Ltd., hydroxyl value). 111.2 KOHmg / g, acid value 1.8 KOHmg / g, number average molecular weight 1010) 129
And 1264 parts of ethyl acetate were added and reacted at 75 ° C. After 4 hours, it was confirmed by FT-IR that the absorption peak of the isocyanate group had disappeared, the reaction was terminated, and a polyurethane resin was obtained. This is designated as PU-C.

Synthesis Example 4 In a reactor equipped with a stirrer, a thermometer, a nitrogen seal tube and a condenser, 100 parts of IPDI, 720 parts of polyol A, and rosin-containing polyol KE-615-3 (manufactured by Arakawa Chemical Industry Co., Ltd., Hydroxyl value 58.5 KOHmg / g, acid value 1.5 KOHmg / g, number average molecular weight 2000) 168
And 988 parts of ethyl acetate were added and reacted at 75 ° C. After 4 hours, it was confirmed by FT-IR that the absorption peak of the isocyanate group had disappeared, the reaction was terminated, and a polyurethane resin was obtained. This is designated as PU-D.

Examples 1 to 5 and Comparative Examples 1 to 4 Preparation of Laminating Adhesive Composition Polyurethane resin, organic isocyanate compound, catalyst,
And a coupling agent were mixed to prepare an adhesive composition for lamination. These are shown in Table 1.

[0035]

[Table 1]

Production of Laminated Film Under the conditions shown below, the adhesive compositions of Examples 1-5 or Comparative Examples 1-4 were applied to the first plastic film and dried, and then the second plastic film was applied thereto. Alternatively, a metal foil was laminated with a nip roll, the adhesive composition was further applied thereto and dried, and then a third plastic film was laminated with a nip roll and aged to produce a laminated film. Solid content of adhesive composition: 25% (diluted with ethyl acetate) Composition of laminate film: 25 μNY / 15 μEVO
H / 50 μCPP 12 μPET / 7 μAl / 70 μCPP Coating amount of adhesive composition: 3.5 g / m ² (after drying) Drying condition: 80 ° C. × 15 seconds Aging condition: 25 ° C. × 24 hours

Evaluation of Laminated Film The laminated film was evaluated under the following conditions.
The results are shown in Tables 2 to 6. Peeling adhesive strength: T-type peeling test (based on JIS K 6854) Tensile speed: 300 mm / min Boiling treatment: A laminated film made of NY / EVOH / CPP is heat-sealed to form a pouch, and water is filled at 95 ° C. And boiled for 30 minutes. Retort treatment: A laminated film made of PET / Al / CPP was heat-sealed to form a pouch, which was filled with water and then retort-treated at 120 ° C. for 30 minutes.

[0038]

[Table 2]

[0039]

[Table 3]

[0040]

[Table 4]

[0041]

[Table 5]

[0042]

[Table 6]

[0043]

EFFECT OF THE INVENTION Laminated films such as plastic films and metal foils produced using the adhesive composition for lamination of the present invention exhibit good adhesive strength at room temperature,
It has become possible to shorten the aging period and lower the aging temperature as compared with the conventionally known adhesive composition. Further, it was confirmed that after the boiling treatment or the retort treatment, no abnormality such as delamination was observed in the appearance of the laminated film, and the adhesive strength was kept practical. Therefore, according to the present invention, the productivity and workability of the laminated film are significantly improved, and the cost and the delivery time can be shortened.

Claims (4)

[Claims] 1. An adhesive composition for laminating comprising an organic compound (A) having a functional group capable of reacting with an isocyanate group, an organic isocyanate compound (B), and a catalyst (C), wherein said isocyanate The organic compound (A) having a functional group capable of reacting with a group is an organic compound obtained by reacting a polyisocyanate component (a) with an isocyanate group-reactive component (b), Adhesive composition. 2. An adhesive composition for laminating comprising an organic compound (A) having a functional group capable of reacting with an isocyanate group, an organic isocyanate compound (B), a catalyst (C) and a coupling agent (D). The organic compound (A) having a functional group capable of reacting with the isocyanate group is an organic compound obtained by reacting the polyisocyanate component (a) with the isocyanate group-reactive component (b). The adhesive composition for lamination as described above. 3. The isocyanate group-reactive component (b)
The adhesive composition for laminating according to claim 1 or 2, which contains rosin polyol (b1). 4. An adhesive composition for lamination according to claim 1, 2 or 3 is applied to a first film and dried, and then the second film is laminated and aged at room temperature. A method for producing a laminated film, comprising: