JPH04249577A - Production of laminate film - Google Patents

Abstract

PURPOSE:To produce a food packaging laminate film excellent in gas barrier properties add retorting resistance (hot water resistance) safely and effectively without causing tunneling by using a solventless one-pack rapidly room temperature-curing adhesive which does not form carbon dioxide. CONSTITUTION:A food packaging laminate film is produced by laminating films on a dry laminator by using an adhesive mainly consisting of a composition comprising a polymer having at least one reactive silicon group in the molecule, a cure accelerator and at least one silane coupling agent and/or at least one reaction product of a silane coupling agent and/or its mixture.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is directed to boil sterilization of foods (8.
The present invention relates to a method for producing a hot water-resistant laminate film for food packaging that can be used for sterilization (0 to 100°C) and retort sterilization (120 to 135°C).

In particular, by using a solvent-free, one-component, room-temperature, short-curing adhesive, the tunneling phenomenon does not occur, and gas barrier properties and retort resistance (hot water resistance) can be achieved safely and efficiently. ) This invention relates to a method for producing a laminate film for food packaging that has excellent properties.

0003

BACKGROUND OF THE INVENTION In recent years, laminate films in which various functional films such as gas barrier and heat-sealable films are laminated have been used for packaging materials, especially food packaging materials. Especially today, when various functions are required at the same time,
It is virtually impossible to satisfy all of these requirements with a single layer film, and we are now in an era where multilayer films are necessary.

[0004] As a multilayer (lamination) technology,
Although there are methods such as wet lamination, dry lamination, hot melt lamination, extrusion lamination, and co-extrusion lamination, dry lamination is currently mainstream due to its heat resistance and base material selectivity.

[0005] In addition, recently, high gas barrier performance is often required, and ON-6 (stretched 6-nylon), PVA (polyvinyl alcohol), EVOH (
EVAL: saponified product of ethylene vinyl acetate copolymer),
Or PVDC (vinylidene chloride) film or PVD
High gas barrier films such as C-coat films,
Al (aluminum foil) with a thickness of 10 μm or more is used. On the other hand, heat-sealable CPP (unstretched polypropylene) film, which is important when processing laminated films into packaging bags, has a thickness of 20 to 50 μm for general-use laminated films, but 50 to 100 μm for retort food. A thick film is used.

[0006] Typical configurations of laminate films for retort food packaging include ON-6 as a transparent type.
/CPP or PET (stretched polyethylene terephthalate film) /CPP or PET/PVDC/CPP
etc., and types using Al include PET/Al/
There are CPP, PET/ON-6/Al/CPP, etc.

On the other hand, retort sterilization is also performed using a general retort (1
Temperatures have become even higher, from 30 minutes at 21 degrees Celsius to high retorts (less than 8 minutes at 135 degrees Celsius), and with the development of microwave ovens.
The requirements for heat resistance and hot water resistance are becoming increasingly strict.

Epoxy and acrylic adhesives have also been developed as adhesives for dry lamination.
Urethane-based materials are mainly used because they do not provide sufficient performance.

[0009] Urethane adhesives are classified into solvent type and non-solvent type, and one-component curing type and two-component curing type.

[0010] The solvent type is a urethane adhesive dissolved in an organic solvent (mainly ethyl acetate from the viewpoint of drying properties).
There are one-component curing types and two-component curing types, but the two-component curing type, which uses polyol as the main ingredient and polyisocyanate as the curing agent, is the mainstream due to its hot water resistance.

[0011] Solvent-type two-component curable urethane adhesives are used to maintain initial adhesiveness by reducing the molecular weight of the resin (usually 10,0
00 to 100,000), the concentration at the time of coating must be reduced to 15 to 30%, and a large amount of solvent is used, so there is no risk of fire or air pollution from exhaust. There are some problems: ■ High energy is required for drying, resulting in high running costs; ■ Costs are high due to solvent and transportation costs; ■ Films with poor solvent resistance cannot be used; ■ Odors caused by residual solvents. (1) When applied to gas barrier films, there are problems such as a decrease in gas barrier properties.

[0012] In the case of solvent-free one-component curable urethane adhesives, diluting solvents cannot be used, so the molecular weight of the resin (generally 3,000 or less) is lowered to a viscosity that can be coated. Immediately after the films are pasted together, there is a lack of initial adhesion (initial tackiness), and the so-called "tunneling phenomenon" occurs where the pasted films partially peel off.
is likely to occur.

Furthermore, even after curing, the heat resistance is not sufficient, and since the adhesive is a moisture curing type, carbon dioxide gas is generated during curing, and the adhesive cannot pass through the gas barrier film. It remains in the adhesive layer and not only reduces the adhesive layer's binding force, but also expands during heat sterilization, causing the laminated film to peel off. For this reason, it is currently impossible to use one-component curable urethane adhesives in applications that require heat resistance and hot water resistance, such as retort food products.

Solvent-free two-component curable urethane adhesives have also been developed, but the mixing ratio of main component/curing agent is 5/1 to 10.
/1, formulation errors and poor mixing are likely to occur, and sufficient performance is often not obtained.

[0015] Also, for the solvent-free type, the adhesive is heated at 80 to 100°C.
Since the coating is applied by heating to lower the viscosity, in the case of a two-component curing type, the reaction starts due to this heating. For this reason, it is necessary to further lower the molecular weight, coat at a lower temperature, or lower the reactivity.

However, if the molecular weight is further lowered, tunneling phenomenon will occur more easily, and if the reactivity is lowered, curing after bonding must be carried out at high temperature for a long time. This causes a problem in that productivity is extremely reduced, and at the same time, the plasticizer, lubricant, antistatic agent, etc. in the film bleed, resulting in a decrease in the film's physical properties and adhesive performance.

[0017] This curing problem is a problem for all urethane adhesives, regardless of whether they are solvent type or non-solvent type, or one-component curing type or two-component curing type. Normally, after winding up a laminated film, curing is required at 40°C for 1 to 2 days until it is completely cured, and for retort food, curing for 3 to 5 days at 40 to 50°C is required. Particularly in the case of high molecular weight solvent-based adhesives, sufficient adhesion cannot be obtained at temperatures below 40°C, and therefore sufficient performance may not be obtained even after long-term curing. For this reason, a large warehouse that can be heated is required as a curing space, and along with the problem of bleeding of additives, etc. mentioned above,
There is a need for adhesives that cure at room temperature or in a short period of time.

[0018]

[Problems to be Solved by the Invention] The present invention was completed as a result of repeated research to solve the above-mentioned problems of the prior art. ■ It is solvent-free, so there are no problems caused by solvents; ■ It exhibits strong initial adhesion immediately after bonding, so tunneling does not occur; ■ It does not generate carbon dioxide gas during curing. Since there is no gas barrier film, a film with gas barrier properties can be used.
The purpose of the present invention is to provide a method for manufacturing a laminate film for retort food that has excellent gas barrier properties and hot water resistance by using an adhesive that completely cures in a day and has good heat resistance.

[0019]

[Means for Solving the Problems] As a result of repeated research to achieve the above object, (A) a polymer having at least one reactive silicon group in one molecule, (B) a curing accelerator, (
C) Using an adhesive whose main component is a composition consisting of one or more silane coupling agents and/or one or more reaction products of silane coupling agents and/or a mixture thereof. By laminating the films with a dry laminator, the adhesive is a solvent-free, one-component curing adhesive that does not generate carbon dioxide gas, has good initial adhesion, and can be cured at room temperature.
It has been found that a laminate film that is completely cured in ~2 days and has good heat resistance can be obtained.

As component (A), the purpose can be achieved if it is a polymer having at least one reactive silicon group in one molecule, but as the main chain, an oxyalkylene polymer (polyether), vinyl polymer, or ether ester block copolymer (Japanese Patent Application Laid-Open No. 62-74
59, etc.) and polyester (Special Publication No. 49-3267)
Publication No. 3, JP-A-54-6096, JP-A-54-
156099, JP-A No. 55-152745, etc.), or saturated hydrocarbon polymers such as isobutylene polymers, or copolymers such as ethylene-vinyl acetate copolymers and ethylene-acrylic acid ester copolymers. Polymers (JP-A-63-6003, JP-A-63-6041)
No. 1, JP-A-1-163255, JP-A-1-1
68764, JP-A-1-170658, etc.)
, or polymers having urethane bonds or carbonate bonds (JP-A-54-6096, JP-A-54-609)
7, etc.) and epoxy compounds (Japanese Patent Application Laid-Open No. 62-7495)
No. 9, etc.), and a polymer consisting of one or more of these can be used.

Among them, polymers having a main chain of polyoxyalkylene such as polyoxypropylene and oxyethylene-oxypropylene copolymers, acrylic esters, methacrylic esters, vinyl acetate, styrene,
It is preferable to use a polymer whose main chain is a vinyl polymer such as a polymer or copolymer containing butadiene, acrylonitrile, diallyl phthalate, etc., or a mixture thereof, since it exhibits excellent initial adhesion.

Examples of the polyoxyalkylene polymer (polyether) having at least one reactive silicon group in one molecule include those disclosed in JP-A-50-156599, JP-A-55-13767, and JP-A-55-13767; Kaisho 55-137
68, JP 57-158226, JP 58-132022, JP 59-12932, JP 62-230845, JP 62-
It can be obtained by the methods disclosed in JP-A No. 256860, JP-A-62-283149, JP-A-63-12660, and the like.

[0023] Examples of vinyl polymers having at least one reactive silicon group in one molecule include, for example, JP-A-54-36395, JP-A-54-37184, JP-A-54- Publication No. 40893, JP-A-54-1
22390, JP 58-19361, JP 58-157810, JP 60-3155
6, JP-A-61-171754, JP-A-6
It can be obtained by the method disclosed in Publication No. 3-54471 and the like.

Furthermore, as a mixture of these, for example, Japanese Patent Application Laid-Open No. 60-31556, Japanese Patent Application Laid-Open No. 63-112
It is disclosed in Publication No. 642 and the like.

In particular, acrylic acid which has (a) a reactive silicon group and whose molecular chain substantially has (i) an alkyl group having 1 to 8 carbon atoms is disclosed in JP-A-63-112642. an alkyl ester monomer unit and/or a methacrylic acid alkyl ester monomer unit, and (ii) an acrylic acid alkyl ester monomer and/or a methacrylic acid alkyl ester monomer unit having an alkyl group having 10 or more carbon atoms. (ii) A curable composition consisting of an oxyalkylene polymer having a reactive silicon group exhibits extremely strong adhesive force in the initial stage of curing, and is effective in preventing tunneling.

[0026] Here, the reactive silicon group is a silicon-containing functional group that can be crosslinked by forming a siloxane bond, and a representative example is the following general formula (I).

[0027]

[Chemical formula 1]

(In the formula, R1 is a substituted or unsubstituted monovalent organic group having 1 to 20 carbon atoms or a triorganosiloxy group, X is a hydroxyl group or a different or similar hydrolyzable group, and a is 0, 1 or 2, b is an integer of 0 or 1 to 3, a=2 and b=3, and m is an integer of 0 to 18). A preferable reactive silicon functional group from the viewpoint of economy etc. is the following general formula (II)

[0029]

[Case 2]

(In the formula, R1 is the same as above, n is 0 to 2
is a group represented by an integer of

As the curing accelerator, organic tin compounds such as dibutyltin dilaurate, dioctyltin dimaleate, dibutyltin phthalate, and dibutyltin diacetyl acetate, organic titanate compounds such as tetrabutyl titanate and triethanolamine titanate, or acidic phosphoric acid esters are used. or a reaction product of an acidic phosphoric acid ester and an amine, or a saturated or unsaturated polycarboxylic acid or its acid anhydride.

[0032] The amount of curing accelerator is 0.1 parts (parts by weight: same hereinafter) of the reactive silicon group-containing compound.
~10 parts (preferably 0.5 to 5 parts) may be blended. From the viewpoint of workability, it is desirable to mix this curing accelerator in advance and use it as a one-component type, but it can also be added and mixed immediately before use and used as a two-component type.

A mixture of these reactive silicon group-containing compounds and a curing accelerator is extremely stable in a dry state even at high temperatures, and when moistened, it cures rapidly even at room temperature without emitting carbon dioxide gas, and is heat resistant. Forms a resin film with good properties.

However, the adhesion to organic resin films is not necessarily sufficient. Especially OPP (oriented polypropylene) film, PVDC film and PVDC
It has weak adhesion to coated films or heat-sealable CPP (unoriented polypropylene), HOPE (high density polyethylene), LDPE (low density polyethylene) films, etc.

Therefore, by blending 1 to 20 parts (preferably 2 to 10 parts) of a silane coupling agent, a reaction product thereof, or a mixture thereof to 100 parts of a reactive silicon group-containing compound, adhesive properties can be improved. sex is improved.

Examples of the silane coupling agent include vinyl group-containing silane coupling agents such as vinyltriethoxysilane and vinyltris(β-methoxyethoxy)silane, and epoxy group-containing silane coupling agents such as γ-glycidoxypropyltrimethoxysilane. Silane coupling agents containing (meth)acrylic groups such as γ-methacryloxypropyltrimethoxysilane, N-β(aminoethyl)-γ-aminopropyltrimethoxysilane and N-β(amino Silane coupling agents containing amino groups such as ethyl)-γ-aminopropylmethyldimethoxysilane and γ-aminopropyltriethoxysilane, other silane coupling agents containing chlorine groups, and silane coupling agents containing mercapto groups. These include, but are not limited to.

[0037] The reaction products of silane coupling agents include reaction products of silane coupling agents with each other, such as a reaction product of an epoxy group-containing silane coupling agent and an amino group-containing silane coupling agent; , the reaction product of an amino group-containing silane coupling agent and an epoxy group-containing compound such as epichlorohydrin or epoxidized soybean oil, or the reaction of an epoxy group-containing silane coupling agent and amines such as ethylenediamine or diphenylamine. products, etc.

[0038] As the silane coupling agent and its reaction product used in the present invention, any of the above-mentioned various silane coupling agents and its reaction products can be used, but
In order to improve adhesion, it is desirable that 30% by weight (preferably 50% by weight) or more of the total amount be an amino group-containing silane coupling agent or a reaction product thereof.

Although the adhesive obtained in this manner has achieved its original purpose, it may be added with an acrylic acid alkyl ester polymer or a tackifier in order to further improve the initial tackiness. , silica may be added to improve cohesive force and heat resistance.

As the acrylic acid alkyl ester polymer for improving the initial adhesiveness, an acrylic acid alkyl ester polymer or copolymer whose main component is an acrylic alkyl ester containing an alkyl group having 2 to 16 carbon atoms is used. An acrylic acid alkyl ester polymer consisting of one or more types of combinations is preferable, and may be blended with component (A),
It may also be obtained by vinyl polymerization in the presence of component (A). Examples of methods for carrying out vinyl polymerization in the presence of component (A) include JP-A-62-84134 and JP-A-62-84134;
Methods disclosed in JP-A No. 2-280217, JP-A-63-3012, etc. can be used.

As the tackifier, any tackifier that can be uniformly and transparently melt-mixed with the reactive silicon group-containing compound can be used. That is, examples of tackifiers used include rosin resins, phenol resins, modified phenolic resins such as terpene-phenol resins, xylene resins, aliphatic petroleum resins, aromatic petroleum resins, terpene resins, and coumaron resins. However, from the viewpoint of initial tackiness, rosin resins such as terpene-phenol resins, phenol resins, and rosin esters are preferred.

The amount of the acrylic (co)polymer and tackifier used is 1 to 100 parts of the reactive silicon group-containing compound.
The amount is preferably 50 parts or less (preferably 100 parts or less). If the temperature is higher than this, curing will be slow and may result in poor curing.
Heat resistance may decrease.

As the silica for improving cohesive force and heat resistance, hydrophobic silica such as Aerosil R972 (Nippon Aerosil Co., Ltd.), Cabosil TS720 (Cabot Corporation), or Rheosil MT10 (Tokuyama Soda Co., Ltd.) is used. do. Hydrophilic silica is not preferred because it reduces the stability of the composition.

[0044] In addition, resins, diluents, plasticizers, fillers, preservatives, antioxidants, ultraviolet absorbers, etc. may be added as necessary, as long as they can be mixed uniformly. Can be done.

The adhesive of the present invention can be used without a solvent, but it can also be used diluted with a solvent. As the solvent, in addition to the conventional strong-odor ethyl acetate, toluene, methyl ethyl ketone, or isopropyl alcohol, low-odor methyl alcohol and ethyl alcohol can be used.

Furthermore, since the adhesive of the present invention has extremely good initial adhesion, it does not need to have a high molecular weight (high viscosity) like urethane adhesives, so it can be applied at a higher concentration than solvent-based urethane adhesives. It is possible to reduce various problems caused by the use of solvents.

[0047]

[Function] As explained above, when using the method for producing a lamination film according to the present invention, since the one-component moisture curing property of the reactive silicon group-containing compound is utilized, a solvent-free one-component film is produced. It is a hardening type that quickly hardens at room temperature and does not emit carbon dioxide gas, so a film with high gas barrier properties can be used.It has good initial adhesion, so it can prevent tunneling. It is possible to provide a lamination film for retort food packaging that has good adhesiveness and hot water resistance.

[0048]

[Examples] The present invention will be explained below with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

Synthesis Example 1 A polyoxypropylene polymer having a group of the following formula (III) at the molecular terminal was obtained according to Synthesis Example 8 of JP-A-63-112642.

[0050]

[Chemical formula 3]

Synthesis Example 2 In 42.5 parts of xylene heated to 110°C, 10 parts of butyl acrylate, 65 parts of methyl methacrylic acid, 20 parts of stearyl methacrylate, and 5 parts of γ-methacryloxypropyltrimethoxysilane were added. A solution containing 2 parts of azobisisobutyronitrile was added dropwise over 6 hours, followed by polymerization for 2 hours, and the xylene was removed under reduced pressure. An acid ester copolymer was obtained.

[0052]

[C4]

Synthesis Example 3 Two parts of acrylic acid were added to 150 parts of toluene heated to 80°C.
-90 parts of ethylhexyl and 10 parts of methyl methacrylate
1 part and 0.5 part of benzoyl peroxide were added dropwise over 6 hours, polymerization was carried out for 2 hours, and toluene was removed under reduced pressure.
An acrylic ester copolymer was obtained.

Examples 1 to 5 Adhesive compositions obtained by mixing the compositions shown in Table 1 under reduced pressure (while melting by heating if necessary) were
℃ and in an atmosphere of 65% RH at 20℃.
(12 μm) film at a coating amount of 5 g/m 2 , and a CPP (70 μm) film was bonded thereto. Thereafter, these films were cured at 25° C. for 2 days to obtain a laminate film.

Comparative Example 1 0.5 g of dibutyltin dilaurate was added to 100 parts of Takenate L-1003 (polyether polyisocyanate manufactured by Takeda Pharmaceutical Co., Ltd.), and a laminate film was prepared in the same manner as in Examples 1 to 5. It was created.

Comparative Example 2 100 parts of New Ace F7-67 (polyester polyol manufactured by Asahi Denka Kogyo Co., Ltd.) was heated to 80° C. and 4,4'-diphenylmethane diisocyanate was heated in a reaction vessel purged with nitrogen gas. 60 parts were reacted for 2 hours (NC
O/OH=6.7/1), a polyester polyisocyanate was obtained.

To 50 parts of the obtained polyester polyisocyanate, 50 parts of Takenate L-1003 and γ-
Adding 5 parts of glycidoxypropyltrimethoxysilane and 0.5 g of dibutyltin dilaurate, Examples 1-
A laminate film was prepared in the same manner as in 5.

[0058]

[Table 1]

The ingredients in Table 1 are as follows. a1: Polyoxypropylene polymer a2 of Synthesis Example 1
: Cylyl 5B25 (Polyoxypropylene polymer b1 containing a terminal silyl group from Kanekabuchi Chemical Co., Ltd.) Methacryl copolymer b2 of Synthesis Example 2 : Kanekazemlac YC75
31 (55% solution of silyl group-containing acrylic resin from Kanekabuchi Chemical Co., Ltd.) dried under reduced pressure c: Cylyl M10 (silyl group-containing reactive diluent from Kanekabuchi Chemical Co., Ltd.) d: Synthesis Acrylic copolymer of Example 3 e: YS Polyster T-80 (terpene phenol resin manufactured by Yasushi Oil Co., Ltd.) f: No. 918 (Equimolar mixed solution of dibutyltin oxide and dioctyl phthalate manufactured by Sanshakyaki Gosei Co., Ltd.)
g1: γ-methacryloxypropyltrimethoxysilane g2: N-β(aminoethyl)-γ-aminopropyltrimethoxysilane g3: N-β(aminoethyl)-γ-aminopropyltrimethoxysilane and γ-glycidoxy Equimolar reaction product h of propyltrimethoxysilane: Rheolosil MT-10 (hydrophobic silica from Tokuyama Soda Co., Ltd.)

Table 2 shows the evaluation results of the laminate films obtained in Examples 1 to 5 and Comparative Examples 1 to 2. Note that the evaluation items, evaluation method, and judgment criteria in Table 2 are as follows.

A. Initial Adhesion Ten minutes after bonding, the laminate film was peeled off, and the peel resistance at that time and the tack (adhesiveness) when the adhesive surface was touched with a finger were judged based on the following criteria. ◎: Strong peel resistance and strong tack ○: Slightly weak peel resistance, but strong tack △: Weak peel resistance and tack ×: Almost no peel resistance and tack

[0062]
B. Tunneling resistance The appearance of the film after curing was observed and judged based on the following criteria. ○: No abnormalities △: Small "lifts and wrinkles" occurred ×: Large "
"lifts and wrinkles" had occurred.

C. Adhesive Strength Cut the laminated film into a piece of 200 mm long x 15 mm wide, and cross-head it with T at a crosshead speed of 300 mm/min.
A mold peel test was conducted and expressed in g/15mm.

D. The heat-resistant laminate film was heated at 120° C. for 60 minutes, and the adhesive strength before and after heating and the appearance after heating were observed. The appearance after heating was judged based on the following criteria. ○: Almost the same as before heating △: Cloudy or floating occurred ×: Obvious peeling occurred in a part of the film

006
5] In Comparative Examples 1 and 2, tunneling occurred at 25°C for 2 days and sufficient adhesion could not be obtained.
A film was used which had been cured at 40° C. for 3 days under a load of Kg/cm 2 . At this time, the adhesive strength before the heat resistance test was 560 for Comparative Example 1 and 810 g/15 mm for Comparative Example 2.

As shown in Table 2, Examples 1 to 5 exhibited excellent performance in initial adhesion, tunneling resistance, adhesion, and heat resistance.

[0067]

[Table 2] ☆: The strengths before the heat resistance test evaluated for the products cured at 40° C. for 3 days were 560 and 810 g/15 mm, respectively.

Retort resistance (hot water resistance) Example 1 in Table 1
, 2 and 3 were applied to a PET film (12 μm) as adhesives 1, 2, and 3, and then coated on an Al foil (15 μm).
μm) were bonded together, then an adhesive was applied to the other side of the Al foil, and a CPP film (70 μm) was bonded thereto. Thereafter, these films were cured at 25° C. for 2 days to obtain a laminate film. No tunneling phenomenon occurred at this time.

[0069] Next, with the CPP side facing inside, heat it at 160°C for 50 minutes.
Kg/cm2, heat sealed in 1 second, bag containing vinegar/salad oil/meat sauce = 1/1/1 (12
After sterilizing this bag with hot water at 135°C for 15 minutes under a pressure of 3.8 kg/cm2, we examined whether there was any floating in the adhesive layer and the adhesive strength between the Al foil and CPP. We measured the As shown in Table 3, the results showed good retort resistance.

[0070]

[Table 3]

[0071]

[Effect of the invention] As specifically shown in the examples above,
The laminate film produced using the method according to the present invention has excellent tunneling resistance, adhesiveness, and retort resistance (hot water resistance).

Furthermore, since it is a solvent-free type, there is no danger, and since it is a one-component curing process, no mixing work is required, and it cures at room temperature in a short time, so it is extremely easy to work with.

Claims (4)

[Claims] Claim 1: (A) a polymer having at least one reactive silicon group in one molecule; (B) a curing accelerator;
C) An adhesive whose main component is a composition consisting of one or more silane coupling agents and/or one or more reaction products of silane coupling agents and/or a mixture thereof. A method for producing a laminate film, characterized in that it is used. 2. (A) a polymer having at least one reactive silicon group in one molecule; (B) a curing accelerator;
C) one or more silane coupling agents and/or one or more reaction products of silane coupling agents and/or a mixture thereof, and (D) having 2 to 1 carbon atoms.
A method for producing a laminate film, which comprises using an adhesive whose main component is a composition consisting of a polymer whose main component is an acrylic acid alkyl ester containing an alkyl group of No. 6. 3. The main chain of the polymer having at least one reactive silicon group in one molecule is one or more oxyalkylene polymers and/or one vinyl polymer.
The method for producing a laminate film according to claim 1 or 2, characterized in that it is a species, or two or more species, and/or a mixture thereof. 4. (A) a polymer having at least one reactive silicon group in one molecule; (B) a curing accelerator;
C) The main component is a composition consisting of one or more silane coupling agents and/or one or more reaction products of silane coupling agents and/or a mixture thereof. Adhesive for laminating films.