JP2012125977A - Method for manufacturing easily tearable structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easily tearable structure in which the whole surface of a film is uniformly torn by enhancing the tearability on the ink in a laminated structure.SOLUTION: The lowering of the tearability on the ink is caused by a phenomenon that a soft sealant film is separated from a hard base material to stretch by the interfacial peeling of an ink layer and an adhesive layer or the cohesive failure of the ink layer. Then, by strongly bonding the ink layer and the adhesive layer to integrate them to suppress the interfacial peeling against the physical force applied at the time of peeling, the tearability on the ink is enhanced.

Description

  The present invention relates to a laminate drawn with a printing ink, and more particularly to a method for producing a laminated composition sandwiched with a sealant film via an adhesive after printing the printing ink on various plastic films. .

  Laminate components are often used in the field of packaging containers. In the case of packaging containers, it is necessary to open the container in order to take out the contents. In the general market, opening is often performed by human hands, and it is a great advantage in terms of convenience to tear and open the container without using a tool such as a bag. If the tearability of the packaging container is poor, a force is required at the time of opening, causing problems such as tearing in unexpected directions and spilling of the contents. Therefore, a laminate composition in the packaging container field requires good tearability. .

  As a conventional technique for imparting tearability, for example, there is a method of creating a trigger for tearing by, for example, making a notch in the end surface of the film, but in such a method, although the improvement of the tearing start is improved, the film surface itself is If it is difficult to tear, it will be caught on the way or will not tear linearly.

  In addition, packaging containers are often drawn with printing ink for the purpose of displaying contents and design, but generally the adhesive strength between the adhesive layer and the ink layer is inferior to that of the uncoated part on the ink, and tearability is inferior. . As a means for improving the tearability of the film surface, it is known that the tearability is improved by hardening the adhesive layer as disclosed in JP-A-2008-274061. However, the ink portion and the plain portion are mixed. In such a case, if the adhesive layer is made to be hard enough to tear on the ink, the non-image area becomes too hard and the physical properties cannot be balanced, and if matched to the uncoated part, the tearability is poor on the ink.

  In order to impart smooth tearability to the entire film surface of the laminate composition, it is necessary to improve the tearability of the ink portion and bring it closer to the tearability of the plain portion.

JP2008-274061

  An object of the present invention is to provide an easily tearable composition that improves the tearability on ink in a laminate composition, whereby the entire film surface is torn uniformly.

  The decrease in tearability on the ink is due to the soft sealant film separating and extending from the hard substrate due to interfacial peeling between the ink layer and the adhesive layer or cohesive failure of the ink layer. Therefore, it is effective to improve the tearing property on the ink by firmly connecting and integrating the ink layer and the adhesive layer to suppress the interfacial peeling against the physical force applied at the time of tearing.

That is, the present invention provides a method for producing an easily tearable composition in which a base film, an ink layer, an adhesive layer and a sealant film are laminated in this order.
The ink layer contains a compound having a functional group A,
The functional group A of the compound having the functional group A is a glycidyl group, a carbodiimide group,
Any functional group selected from an aziridinyl group and an oxazoline group;
And the adhesive layer contains a compound having a functional group B,
The functional group B of the compound having the functional group B is a carboxyl group,
further,
The functional group B of the compound having the functional group B is the functional group A of the compound having the functional group A.
It is related with the manufacturing method of the easily tearable structure characterized by being able to react with.

  Furthermore, this invention relates to the easily tearable structure manufactured by said manufacturing method.

  According to the present invention, smooth tearability over the entire film surface can be obtained when the laminate is opened.

  In the present invention, it is necessary that the ink layer contains a compound having a functional group A, and at the same time, the adhesive layer contains a compound having a functional group B capable of reacting with the functional group A. is required.

  In particular, a combination in which the functional group A is any functional group selected from a glycidyl group, a carbodiimide group, an aziridinyl group, and an oxazoline group, and the functional group B is a carboxyl group is particularly useful.

  Since the functional group A in the ink layer and the functional group B in the adhesive layer react with each other, the ink layer and the adhesive layer are firmly connected to each other, so that the sealant does not peel off at the interface against the physical force of tearing. It does not extend and tearability is improved. Therefore, after the functional group A and the functional group B react, the compound having each needs to be firmly fixed to each layer.

  In that sense, the compound having the functional group A and the functional group B is preferably a high molecular weight body. For example, the functional group A is preferably present in the binder resin and the functional group B is preferably present in the adhesive main agent.

  Next, the ink of the present invention will be described in detail. Note that “ink” used in the following description means “printing ink”.

  Since it has a function required as an ink, in addition to the compound having the functional group A, it can contain a resin, an organic solvent, a colorant and the like. In addition, extender pigments, pigment dispersants, leveling agents, antifoaming agents, waxes, silane coupling agents, plasticizers, infrared absorbers, ultraviolet absorbers, fragrances, flame retardants, and the like can be included as necessary.

  Examples of the resin used in the ink of the present invention include resins used in general inks, paints, and recording agents. Examples of the resin include polyurethane resin, polyurethane / urea resin, vinyl chloride-vinyl acetate copolymer resin, chlorinated polypropylene resin, ethylene-vinyl acetate copolymer resin, vinyl acetate resin, polyamide resin, nitrocellulose resin, acrylic resin , Polyester resin, alkyd resin, polyvinyl chloride resin, rosin resin, rosin modified maleic acid resin, ketone resin, cyclized rubber, chlorinated rubber, butyral, petroleum resin and the like. The resins can be used alone or in admixture of two or more. The resin content is preferably 4 to 25% by weight, more preferably 6 to 20% by weight, based on the total weight of the ink.

  Of the above resins, polyurethane / urea resins are preferred from the viewpoints of general-purpose adhesion and suitability for boil / retort. Polyurethane / urea resins are widely used as resins for laminating inks. The content of polyurethane / urea resin in the ink is 4% by weight or more from the viewpoint of sufficient adhesion of the ink to the printing medium, and 25% from the viewpoint of moderate ink viscosity and work efficiency at the time of ink production and printing. % Or less is preferable, and the range of 6 to 20% by weight is more preferable.

  Polyurethane / urea resins are conventionally known methods such as JP-A-62-153366, JP-A-62-153367, JP-A-1-236289, JP-A-2-64173, and JP-A-2- 64174, JP-A-2-64175 and the like. Specifically, it can be obtained by reacting a hydroxyl group-containing compound such as polyol or diol with an isocyanate compound in an excess of isocyanate to form an isocyanate-terminated prepolymer, and further reacting the amine compound and an approximate prepolymer in an excess of amine.

  Examples of hydroxyl-containing compounds such as polyols and diols include polyether polyols such as polymers or copolymers of ethylene oxide, propylene oxide, tetrahydrofuran, etc .; ethylene glycol, 1,2-propanediol, 1,3-propanediol 1,3-butanediol, 1,4-butanediol, neopentyl glycol, pentanediol, 3-methyl-1,5-pentanediol, hexanediol, 1,4-butynediol, saturated and unsaturated such as diethylene glycol, triethylene glycol, dipropylene glycol Monomolecular compounds such as low molecular weight glycols, alkyl glycidyl ethers of n-butyl glycidyl ether, 2-ethylhexyl glycidyl ether, glycidyl ester of versatic acid, etc. Glycidyl acid esters, adipic acid, phthalic acid, isophthalic acid, terephthalic acid, maleic acid, fumaric acid, succinic acid, oxalic acid, malonic acid, glutaric acid, pimelic acid, speric acid, azelaic acid, sebacic acid, dimer Polyester polyols obtained by dehydration condensation of dibasic acids such as acids or their anhydrides; polyester polyols obtained by ring-opening polymerization of cyclic ester compounds; other polycarbonate polyols, polybutadiene glycols, oxidized to bisphenol A Various known high molecular weight diols generally used for the production of polyurethane, such as glycols obtained by adding ethylene or propylene oxide, can be mentioned.

  Of these high molecular weight diols, when a high molecular weight diol obtained from a glycol and a dibasic acid is used, up to 5 mol% of the glycols can be substituted with the following various polyols. That is, for example, it may be substituted with a polyol such as glycerin, trimethylolpropane, trimethylolethane, 1,2,6-hexanetriol, 1,2,4-butanetriol, sorbitol, pentaerythritol. These polyols may be used alone or in combination of two or more.

  When it is desired to introduce an aziridinyl group as the functional group A, a polyfunctional aziridine compound having a hydroxyl group such as tetramethylolmethane-tri-β-aziridinylpropionate can be incorporated during urethane polymerization.

  In addition, after synthesizing a resin using a diol having a carboxyl group such as dimethylolbutanoic acid or dimethylolpropionic acid, a polyfunctional product of glycidyl group, carbodiimide group, aziridinyl group and oxazoline group can be grafted. .

  Examples of the polyfunctional product of glycidyl group include bisphenol A diglycidyl ether, trimethylolpropane polyglycidyl ether, and pentaerythritol polyglycidyl ether. Examples of the polyfunctional product of carbodiimide group include poly (1,6-hexamethylenecarbodiimide) and poly (1 , 3-cyclohexylenecarbodiimide), poly (p-phenylenecarbodiimide), and the like.

  Examples of the polyfunctional compound of the aziridinyl group include 3- (1-aziridinyl) propionate and 4,4-bis (ethyleneiminocarbonylamino) diphenylmethane.

  Examples of the polyfunctional product of the oxazoline group include 1,4-bis (4,5-dihydro-2-oxazoyl) benzene, 1,3-bis (4,5-dihydro-2-oxazoyl) benzene and the like.

  Examples of the isocyanate compound include various known diisocyanates that are aromatic, aliphatic, or alicyclic. For example, 1,5-naphthylene diisocyanate, 4,4′-diphenylmethane diisocyanate, 4,4′-diphenyldimethylmethane diisocyanate, 4,4′-dibenzylisocyanate, dialkyldiphenylmethane diisocyanate, tetraalkyldiphenylmethane diisocyanate, 1,3- Phenylene diisocyanate, 1,4-phenylene diisocyanate, tolylene diisocyanate, butane-1,4-diisocyanate, hexamethylene diisocyanate, isopropylene diisocyanate, methylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, cyclohexane-1,4-diisocyanate , Xylylene diisocyanate, isophorone diisocyanate, lysine diisocyanate Dicyclohexylmethane-4,4'-diisocyanate, 1,3-bis (isocyanatemethyl) cyclohexane, methylcyclohexane diisocyanate, norbornane diisocyanate, m-tetramethylxylylene diisocyanate, dimerisocyanate obtained by converting the carboxyl group of dimer acid into an isocyanate group, etc. A typical example is given. These organic diisocyanate compounds may be used alone or in combination of two or more.

Examples of the amine compound include ethylenediamine, propylenediamine, hexamethylenediamine, triethylenetetramine, diethylenetriamine, isophoronediamine, dicyclohexylmethane-4,4′-diamine and the like.
It also has a hydroxyl group in the molecule such as 2-hydroxyethylethylenediamine, 2-hydroxyethylpropyldiamine, g-2-hydroxyethylethylenediamine, g-2-hydroxyethylpropylenediamine, 2-hydroxypropylethylenediamine, and g-2-hydroxypropylethylenediamine. Diamines can be used.

  Furthermore, a monovalent active hydrogen compound can also be used for the purpose of stopping the reaction. Examples of such compounds include dialkylamines such as di-n-butylamine and alcohols such as ethanol and isopropyl alcohol.

  When it is desired to introduce the functional group A at the resin terminal, after introducing a carboxyl group using an amino acid such as glycine or L-alanine as a reaction terminator, the polyfunctional product of the functional group A may be grafted as described above. .

  In addition, when the functional group A is a glycidyl group, after synthesizing a polyurethane urea resin having a resin terminal as a primary or secondary amine, the polyfunctional glycidyl compound as described above is reacted to thereby form a glycidyl group in the resin. Can be incorporated.

  The weight average molecular weight of polyurethane / urea resin is 10,000 or more from the viewpoint of water resistance / solvent resistance, boil / retort suitability, ink re-dissolvability, printing trouble (decrease in plate clogging and printability) In view of the above, 100,000 or less is preferable. More preferably, it is the range of 20,000-80,000. The weight average molecular weight of the polyurethane-urea resin can be determined by gel permeation chromatography (GPC) or a relational expression between the intrinsic viscosity of the polymer and the weight average molecular weight. The skeleton structure of the polyurethane / urea resin may be branched or linear. The terminal of the polyurethane / urea resin is preferably an amine.

  Examples of the organic solvent used in the ink of the present invention include hydrocarbon-based, ketone-based, ester-based, and alcohol-based organic solvents used in general inks, paints, and recording agents. Specifically, hydrocarbons such as toluene, methylcyclohexane, ethylcyclohexane, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, esters such as ethyl acetate, npropyl acetate, butyl acetate, methanol, ethanol, Alcohol-based organic solvents such as propanol and butanol can be used. From the viewpoint of reducing the amount of solvent remaining in the ink film after printing, a small amount of a high boiling point solvent can be used in combination. The organic solvent used in the ink of the present invention can be used alone or in admixture of two or more.

  Examples of the colorant used in the ink of the present invention as needed include organic and inorganic pigments used in general inks, paints, and recording agents. Organic pigments include azo, phthalocyanine, anthraquinone, perylene, perinone, quinacridone, thioindigo, dioxazine, isoindolinone, quinophthalone, azomethine azo, dictopyrrolopyrrole, and isoindoline. Can be mentioned. Indigo ink is preferably copper phthalocyanine from the viewpoint of coloring power.

  Examples of inorganic pigments include carbon black, titanium oxide, zinc oxide, zinc sulfide, barium sulfate, calcium carbonate, chromium oxide, silica, and bengara. From the viewpoint of coloring power, it is preferable to use titanium oxide for white ink and carbon black for black ink.

  The pigments can be used alone or in admixture of two or more for the purpose of adjusting hue and density. The pigment is contained in the ink in an amount that ensures the concentration and coloring power of the ink, preferably 4 to 50% by weight based on the total weight of the ink.

  In order to stably disperse the pigment in the organic solvent, it is possible to disperse the resin alone, but it is also possible to use a dispersant in order to disperse the pigment stably. As the dispersant, anionic, nonionic, cationic, amphoteric surfactants can be used. The dispersant is preferably contained in the ink in an amount of 0.05% by weight or more based on the total weight of the ink from the viewpoint of the storage stability of the ink and 5% by weight or less from the viewpoint of the suitability for lamination. .1 to 2% by weight.

  The ink of the present invention can be produced by dissolving and / or dispersing a resin, a colorant and the like in an organic solvent. Specifically, an ink can be produced by producing a pigment dispersion in which a pigment is dispersed in an organic solvent with a resin, and blending a compound or the like with the obtained pigment dispersion.

  The particle size distribution of the pigment in the pigment dispersion is adjusted by appropriately adjusting the size of the grinding media of the disperser, the filling rate of the grinding media, the dispersion treatment time, the discharge speed of the pigment dispersion, the viscosity of the pigment dispersion, and the like. be able to. As a disperser, generally used, for example, a roller mill, a ball mill, a pebble mill, an attritor, a sand mill and the like can be used. In the case where bubbles or unexpectedly large particles are included in the ink, it is preferably removed by filtration or the like in order to reduce the quality of the printed matter. A conventionally well-known filter can be used.

  The ink viscosity produced by the above method is in the range of 10 mPa · s or more from the viewpoint of preventing the pigment from settling and being appropriately dispersed, and 1000 mPa · s or less from the viewpoint of workability efficiency during ink production or printing. preferable. In addition, the said viscosity is a viscosity measured at 25 degreeC with the Tokimec B-type viscometer. The viscosity of the ink can be adjusted by appropriately selecting the type and amount of the raw material used, for example, urethane / urea resin, colorant, organic solvent and the like. When a pigment is used as the colorant, the viscosity of the ink can be adjusted by adjusting the particle size and particle size distribution of the pigment in the ink.

  Next, the easily tearable composition of the present invention will be described. The easily tearable composition of the present invention is a laminate composition in which an ink layer printed on a substrate film is laminated with a sealant film via an anchor coat agent or an adhesive. The laminate composition of the present invention is obtained by printing the ink of the present invention on a printing material by gravure printing or flexographic printing, and by a method such as extrusion lamination (dry lamination), dry lamination, non-sol dry lamination, etc. Can be obtained by laminating. In addition, an ink that does not satisfy the conditions of the present invention is printed on the substrate film by the above method, and the processed product obtained by finally printing the ink of the present invention and laminating by the above method is also cited as the laminated product of the present invention. Can do.

  If the bond between the ink layer and the adhesive layer becomes sufficiently strong according to the present invention, the stronger the ink layer, the better the tearability. Therefore, in order to improve the bond in the ink layer, the polyfunctional isocyanate compound is used as an ink curing agent. It is desirable to add as.

  Examples of the base film used in the easily tearable composition of the present invention include plastics generally used for gravure printing or flexographic printing. Plastics include uniaxially or biaxially stretched or unstretched films or sheets such as nylon, polyester, polypropylene, polyethylene, etc. These are generally subjected to surface treatments such as corona discharge treatment and low temperature plasma treatment. It has been subjected. Furthermore, a film or sheet made of cellophane, moisture-proof cellophane, vinyl chloride resin, vinylidene chloride resin, styrene resin, vinyl acetate resin, vinyl alcohol resin, polyamide or the like, or a laminate thereof can also be mentioned. .

  Examples of the sealant film used in the easily tearable composition of the present invention include the plastic film or sheet, or aluminum foil. In particular, as the resin to be extruded (extruded laminate), low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-vinyl acetate copolymer or saponified product thereof, ethylene-acrylic acid Examples thereof include a copolymer, an ethylene-ethyl acrylate copolymer, and polypropylene.

  Examples of the adhesive used in the easily tearable composition of the present invention include those commonly used for laminating processing including the functional group B. The main agents include ester-based and ether-based adhesives. , Urethane type, modified polyolefin type and the like. In particular, when the functional group B is a carboxyl group, a polyester resin condensed so that the terminal may be a carboxyl group may be used as a main agent, or a carboxyl group may be added with an acid anhydride after condensation in a form that forms a terminal hydroxyl group. Good. If a carboxyl group is introduced into the urethane resin main component, dimethylolpropionic acid may be incorporated by urethane polymerization, or an amino acid such as glycine or L-alanine may be used as a reaction terminator as described above.

  The easily tearable composition of the present invention is formed into a container such as a bag, and is used by being filled with food and drink, medical products, medical instruments and the like.

  EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited by these Examples. In the examples, “parts” represents parts by weight, and “%” represents weight percent.

[Synthesis Example 1]
A four-necked flask equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen gas introduction tube was added to a polycondensation product of 3-methyl-1,5-pentanediol having a number average molecular weight of 2000 and adipic acid, that is, poly ( 3-methyl-1,5-pentyl adipate) diol (hereinafter referred to as PMPA)
21.7 parts and 5.3 parts of isophorone diisocyanate were charged, reacted at 120 ° C. for 6 hours under a nitrogen stream, then cooled to 80 ° C., tetramethylolmethane-tri-β-aziridinyl propionate After 93 parts and 6.75 parts of ethyl acetate were added and reacted for another 3 hours, 16.1 parts of ethyl acetate was added and cooled to obtain 50.78 parts of a solution of a terminal isocyanate prepolymer. Next, 50.78 parts of a solvent solution of the obtained terminal isocyanate prepolymer was gradually added to a mixture of 2.07 parts of isophoronediamine, 26.15 parts of ethyl acetate and 21.0 parts of isopropyl alcohol at room temperature. And a polyurethane resin solution (PU01) having a solid content of 30% and a weight average molecular weight of 46000 was obtained.

[Synthesis Example 2]
A four-necked flask equipped with a stirrer, a thermometer, a reflux condenser and a nitrogen gas inlet tube was charged with 22.19 parts of PMPA having a number average molecular weight of 2000 and 5.43 parts of isophorone diisocyanate, and at 120 ° C. for 6 hours under a nitrogen stream. After the reaction, the temperature was lowered to 80 ° C., 0.26 parts of 2-diethylaminoethanol and 6.91 parts of ethyl acetate were added, and the mixture was further reacted for 3 hours. Then, 15.9 parts of ethyl acetate was added and cooled, and the terminal isocyanate prepolymer was cooled. 50.69 parts of a polymer solution were obtained. Next, 50.69 parts of the solvent solution of the obtained terminal isocyanate prepolymer was gradually added to a mixture of 2.12 parts of isophoronediamine, 26.19 parts of ethyl acetate and 21.0 parts of isopropyl alcohol at room temperature. And a polyurethane resin solution (PU02) having a solid content of 30% and a weight average molecular weight of 41000 was obtained.

[Synthesis Example 3]
In a four-necked flask equipped with a stirrer, thermometer, reflux condenser and nitrogen gas inlet tube, 100 parts of PU02, in particular 33.12 parts of pentaerythritol polyglycidyl ether and 16.23 parts of ethyl acetate and 6.95 of isopropyl alcohol. Part of the mixture was added at room temperature, and then reacted at 50 ° C. for 3 hours to obtain a polyurethane resin solution (PU03) having a solid content of 30% and a weight average molecular weight of 43,000.

[Production Example 1]
Titanium oxide 30 parts, polyurethane resin solution (PU01) 8.3 parts, ethyl acetate / isopropyl alcohol mixed solvent (weight ratio 75/25) 11.7 parts were mixed by stirring and kneaded in a sand mill, and then the polyurethane resin solution (PU01 ) 33.3 parts and 16.7 parts of n-propyl acetate / isopropyl alcohol mixed solvent (weight ratio 75/25) were stirred and mixed to obtain a white printing ink. To 100 parts of this white white ink, 50 parts of an n-propyl acetate / isopropyl alcohol mixed solvent (weight ratio 75/25) was added and mixed as a diluent solvent, and further an isocyanate curing agent (hexamethylene diisocyanate trimethylolpropane adduct) 3 The diluted printing ink (W01) was obtained.

[Production Example 2]
A white white ink is prepared using a polyurethane resin solution (PU01) in the same manner as in Production Example 1, and 50 parts of a mixed solvent of n-propyl acetate / isopropyl alcohol (weight ratio 75/25) is added and mixed as a diluent solvent thereto. Diluted printing ink (W02) was obtained.

[Production Example 3]
A diluted printing ink (W03) was obtained using polyurethane resin solution PU03 in the same manner as in Production Example 1.

[Production Example 4]
Using the polyurethane resin solution PU02 in the same manner as in Production Example 1, a diluted printing ink (W04) was obtained.

[Example 1]
The diluted printing ink (W01) obtained in Production Example 1 was printed on a corona-treated nylon film (NY) by a gravure printing machine equipped with a gravure plate having a plate depth of 35 μm and dried at 60 ° C. to obtain a printed matter. For the obtained printed matter, a PE sealant film and a laminate adhesive using TM-550 manufactured by Toyo Morton Co., Ltd. (measured acid value of 14 mg KOH / g) and an isocyanate curing agent (CATRT-37 manufactured by Toyo Morton Co., Ltd.) After laminating and aging at 50 ° C. for 60 hours, tearability was evaluated.

<Evaluation of tearability>
The tearability was evaluated by placing a trigger with a cutter in the direction perpendicular to the printed part edge and printing, and tearing by hand.
The evaluation criteria for tearability are as follows, and the practical level is Δ or more. Evaluation was performed and the results are shown in Table 1.
(Evaluation criteria)
◎: Tearing without resistance ○: Slight resistance but tearing △: Slightly stretch sealant, but somehow tearing △ ×: Start tearing and / or clear sealant elongation along the way ×: No tearing at all

[Example 2]
Using diluted printing ink (W02) in the same manner as in Example 1, printing and lamination were performed, and tearability was evaluated in the same manner.

[Example 3]
Using diluted printing ink (W03) in the same manner as in Example 1, printing and lamination were performed, and tearability was evaluated in the same manner.

[Comparative example]
Using diluted printing ink (W04) in the same manner as in Example 1, printing and lamination were performed, and tearability was evaluated in the same manner.

[Reference example]
The purpose of the present invention is to obtain a smooth tearability on the entire surface of the film by bringing the tearability of the ink part closer to that of the plain part. The tearability was evaluated in the same manner as in Example 1.

  The results are shown in Table 1.

Claims (2)

In the production method of an easily tearable composition in which a base film, an ink layer, an adhesive layer and a sealant film are laminated in this order,
The ink layer contains a compound having a functional group A,
The functional group A of the compound having the functional group A is a glycidyl group, a carbodiimide group,
Any functional group selected from an aziridinyl group and an oxazoline group;
And the adhesive layer contains a compound having a functional group B,
The functional group B of the compound having the functional group B is a carboxyl group,
further,
The functional group B of the compound having the functional group B is the functional group A of the compound having the functional group A.
A process for producing an easily tearable composition characterized by being capable of reacting with. An easily tearable composition produced by the production method according to claim 1.