Anchor coat agent, laminate, and method for manufacturing the same

Abstract

To provide an anchor coat agent for a laminate activating metallic gloss such as aluminum which is excellent in blocking resistance and adhesion.SOLUTION: An anchor coat agent for being used in formation of an anchor coat layer of a laminate having paper, an aluminum layer, the anchor coat layer and a printed layer composed of a cured product of active energy ray-curable ink in this order contains a vinyl chloride-vinyl acetate copolymer resin and a polyester resin, and has a glass transition temperature of the polyester resin of 60°C or lower.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an anchor coating agent, a laminate, and a method for producing the same.

Background Art

[0002] In recent years, it has been common for product packages and other packaging materials to be printed for decoration and surface protection. Also, the print quality of printed matter, such as its design, cosmetic appearance, and high-class feel, promotes consumers' purchasing desire depending on how it is done, and has great industrial value.

[0003] Conventionally, laminate packaging materials using plastic films have mainly been used for the packaging structure. However, laminate packaging materials use a large amount of plastic films made of petroleum-derived materials, and from the viewpoints of plastic reduction, environmental response, and carbon neutrality, a change to paper (paper packaging materials) is desired, and technological development has been carried out. Printed matter can obtain unique design, cosmetic appearance, and high-class feel by printing on a metal surface such as aluminum, and for these reasons, it is often printed on a metal surface. However, metal surfaces such as aluminum are inferior in adhesiveness to offset ink, gravure ink, etc., and surface treatment is often performed with various anchor coating agents. For example, Patent Document 1 describes a laminate comprising a polyethylene resin layer, a paper base material layer, an aluminum foil layer, an anchor coat layer (primer treatment layer), and a pattern printing layer. Also, Patent Document 2 describes a laminate comprising a paper or film base material layer, an aluminum foil or aluminum vapor deposition layer, an anchor coat layer, and an electron beam curable flexo ink layer.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, considering the popularity of printing methods, electron beam curable flexo inks are not the mainstream, and application with active energy ray curable offset inks such as ultraviolet curable inks is desired. However, with the disclosed composition of the anchor coat, the adhesion of ultraviolet curable offset inks to the substrate cannot be said to be sufficient while maintaining printing suitability such as blocking resistance, and there remains a concern about ink peeling during post-processing, distribution, and consumer use, which has been a problem in practice. The present invention is an anchor coat agent for a laminate that makes use of the metallic luster of metals such as aluminum, and an object thereof is to provide an anchor coat agent having excellent blocking resistance and adhesiveness.

Means for Solving the Problems

[0006] As a result of intensive studies on the above problems, the present inventor has found that the above problems can be solved by using the anchor coat agent described below, and has thus completed the present invention.

[0007] That is, the present invention is an anchor coat agent for forming an anchor coat layer of a laminate having, in this order, a paper, an aluminum layer, an anchor coat layer, and a printing layer composed of a cured product of an active energy ray curable ink, comprising a vinyl chloride-vinyl acetate copolymer resin and a polyester resin, wherein the glass transition temperature of the polyester resin is 60°C or lower, relates to an anchor coat agent.

[0008] Further, the present invention relates to the above-described anchor coat agent, wherein the vinyl chloride-vinyl acetate copolymer resin contains an acid group.

[0009] Further, the present invention relates to the anchor coat agent according to any one of the above, wherein the glass transition temperature of the polyester resin is 20°C or lower.

[0010] The present invention also relates to an anchor coating agent according to any one of the above, wherein the mass ratio of the vinyl chloride-vinyl acetate copolymer resin to the polyester resin is 60:40 to 85:15.

[0011] The present invention also relates to a laminate having, in this order, paper, an aluminum layer, an anchor coating layer formed from the anchor coating agent according to claim 1 or 2, and a printed layer composed of a cured product of an active energy ray-curable ink.

[0012] The present invention also relates to a laminate according to the above description, wherein the thickness of the aluminum layer is 5 to 30 μm.

[0013] The present invention also relates to a laminate according to the above description, wherein the printed layer contains a rosin resin and / or a diallyl phthalate resin.

[0014] The present invention also relates to a method for producing a laminate according to the above description, a step (A) of laminating paper and an aluminum layer, a step (B) of laminating the aluminum layer and the anchor coating layer, a step (C) of laminating the anchor coating layer and the printed layer, and the method for producing a laminate is characterized in that the step (B) is performed before 72 hours after the end of the step (A).

[0015] According to the present invention, an anchor coating agent for a laminate that makes use of the metallic luster of metals such as aluminum, and that has excellent blocking resistance and adhesiveness, has been provided.

Embodiments for Carrying Out the Invention

[0016] <Laminate> The laminate of the present invention has, at least, paper, an aluminum layer, an anchor coating layer, and a printed layer in this order. It is not excluded that there are layers other than the above between the outside of the laminate or between the respective layers.

[0017] <Paper> The paper substrate serving as the base substrate can be selected from various types according to the intended use, but paper with high smoothness on at least one side, which makes it easy to obtain a bright feeling on the aluminum surface of the laminate, is desirable. Paper types with high surface smoothness such as cast-coated paper and art paper are preferred. Regarding the paper thickness, it can be freely selected according to the rigidity (stiffness) of the laminate required for the final application, but from the viewpoints of processability and application suitability, the basis weight is 30 to 500 g / m 2 , preferably 50 to 300 g / m 2 is desirable.

[0018] <Aluminum layer> As the aluminum layer, general aluminum foil can be used and it is used by being laminated with the paper substrate. The film thickness is not particularly limited, but a range of 7 to 50 μm, preferably a range of 5 to 30 μm is desirable. The laminated surface is not particularly limited to a glossy surface or a matte surface, but in order to obtain a bright feeling of the printed matter, it is desirable to laminate with a matte surface.

[0019] <Anchor coat layer> The anchor coat layer is used to integrate the paper or the aluminum layer with the printing layer. The anchor coat layer contains a vinyl chloride-vinyl acetate copolymer resin and a polyester resin. The anchor coat layer is formed from an anchor coating agent. The anchor coating agent contains at least a binder resin and a solvent, and as the binder resin, it contains a vinyl chloride-vinyl acetate copolymer resin and a polyester resin.

[0020] (Vinyl chloride-vinyl acetate copolymer resin) The vinyl chloride-vinyl acetate copolymer is obtained by copolymerizing vinyl chloride and vinyl acetate. The vinyl chloride-vinyl acetate copolymer preferably has an acid group. In the present invention, the acid group contained in the vinyl chloride-vinyl acetate copolymer refers to a carboxyl group, a carboxylic anhydride group, a sulfonic acid group, and a phosphoric acid group. Among these, a carboxyl group and a carboxylic anhydride group are preferred. Vinyl chloride-vinyl acetate copolymers having an acid group can be obtained, for example, by copolymerizing vinyl chloride and vinyl acetate with an unsaturated carboxylic acid and / or acid anhydride component. Examples of the unsaturated carboxylic acid include fumaric acid, maleic acid, itaconic acid, citraconic acid, vinylbenzoic acid, etc., and examples of the acid anhydride include maleic anhydride, itaconic anhydride, citraconic anhydride, etc. However, vinyl monomers having a carboxylic acid or its anhydride can be used. The unsaturated carboxylic acid and the acid anhydride may be copolymerized alone or both components may be copolymerized. The amount of the unsaturated carboxylic acid and / or acid anhydride component contained in the vinyl chloride-vinyl acetate copolymer is desirably 3 mgKOH / g or more, more preferably 5 mgKOH / g or more, as the acid value of the copolymer. Also, the weight average molecular weight of the vinyl chloride-vinyl acetate copolymer resin is desirably 50,000 to 100,000. When the weight average molecular weight is low, it is difficult to obtain cohesive force, and when it is high, the viscosity of the anchor coating agent becomes high and the coating amount becomes small, so it is difficult to obtain the effect of the anchor coating. Also, the glass transition temperature of the vinyl chloride-vinyl acetate copolymer resin is desirably 60°C or higher. If it is less than 60°C, the blocking property after printing tends to decrease. Commercially available products of vinyl chloride-vinyl acetate copolymer resin include Solvaine M5, M5R manufactured by Nissin Chemical Co., Ltd., VINNOL E15 / 45M, H15 / 45M, H30 / 48M manufactured by Wacker Chemie AG, etc.

[0021] (Polyester resin) The polyester resin is obtained by subjecting a polybasic acid component and a polyhydric alcohol component to an esterification reaction. As the polybasic acid component, for example, one or more dibasic acids such as phthalic anhydride, isophthalic acid, terephthalic acid, succinic acid, fumaric acid, adipic acid, azelaic acid, sebacic acid, dimer acid, and lower alkyl esters of these acids are mainly used. If necessary, monobasic acids such as benzoic acid, crotonic acid, p-t-butylbenzoic acid, and polybasic acids with three or more valences such as trimellitic anhydride, methylcyclohexenetricarboxylic acid, and pyromellitic anhydride are used in combination. As the polyhydric alcohol component, for example, dihydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol, 1,4-butanediol, neopentyl glycol, 3-methylpentanediol, 1,4-hexanediol, 1,6-hexanediol, cyclohexanedimethanol, and bisphenol A are mainly used. Further, if necessary, polyhydric alcohols with three or more valences such as glycerin, trimethylolethane, trimethylolpropane, and pentaerythritol can be used in combination. These polyhydric alcohols can be used alone or in a mixture of two or more.

[0022] The polyester resin preferably has a glass transition temperature of 60°C or lower, preferably 20°C or lower, more preferably 10°C or lower. If the glass transition point temperature is high, the adhesion to the substrate tends to decrease. Also, the polyester resin desirably has a number average molecular weight of 20,000 to 50,000 in order to obtain cohesive force. When the number average molecular weight is low, it is difficult to obtain cohesive force. When it is high, the viscosity of the anchor coat agent becomes high and the coating amount becomes small, so it is difficult to obtain the effect of the anchor coat. Examples of commercially available polyester resins include BYRON 300, 500, 560, 630, 650, 670, GK130, 140, 150, 330, 590, 680, 890 manufactured by Toyobo Co., Ltd., and ELETER UE-3220, 3500 manufactured by Unitika Ltd.

[0023] As the binder resin of the anchor coating agent, resins other than vinyl chloride-vinyl acetate copolymer resin and polyester resin can be used. Further, it is preferable that the mass ratio of the vinyl chloride-vinyl acetate copolymer resin to the polyester resin is 60:40 to 85:15.

[0024] (Solvent) As the solvent used in the anchor coating agent, ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, and acetone, ester solvents such as ethyl acetate and propyl acetate, ether solvents such as tetrahydrofuran, and hydrocarbons such as toluene, xylene, and methylcyclohexane can be used in combination. Additives such as antioxidants can be added to the anchor coating agent as necessary.

[0025] <Printing layer> The printing layer is composed of a cured product of an active energy ray curable ink. The active energy ray refers to ultraviolet rays, electron beams, etc. Examples of the active energy ray curable ink include energy ray curable offset inks. The active energy ray curable ink contains a vinyl monomer curable by active energy rays. Examples of the monomer curable by active energy rays include monomers having an ethylenically unsaturated group (ethylenically unsaturated monomers). Here, the ethylenically unsaturated monomer is a monomer having an ethylenically unsaturated bond (carbon-carbon double bond). The ethylenically unsaturated monomer is a monomer (vinyl monomer) having an ethylenically unsaturated group such as a vinyl group, a vinylene group, a vinylidene group, a (meth)acryloyl group, or a (meth)acrylamide group. The ethylenically unsaturated group may be a vinyl group, vinylene group, vinylidene group, (meth)acryloyl group, etc., and is preferably a (meth)acryloyl group. In this embodiment, the "(meth)acryloyl group" means an "acryloyl group" and a "methacryloyl group". The same applies to "(meth)acrylate" and "(meth)acrylamide group". The monomer component may be a monofunctional (meth)acrylate monomer having one (meth)acryloyl group, or a polyfunctional (meth)acrylate monomer having a plurality of (meth)acryloyl groups. Specifically, examples of the monofunctional monomer include alkyl (meth) acrylates such as methyl (meth) acrylate, ethyl (meth) acrylate, and butyl (meth) acrylate; benzyl (meth) acrylate; alkylphenols (such as butylphenol, octylphenol, nonylphenol, or dodecylphenol); (meth) acrylates of ethylene oxide adducts; isobornyl (meth) acrylate; cyclohexyl (meth) acrylate; tricyclodecane monomethylol (meth) acrylate; 2-hydroxyethyl (meth) acrylate; 2-hydroxypropyl (meth) acrylate; 3-hydroxypropyl (meth) acrylate; 2-hydroxybutyl (meth) acrylate; 4-hydroxybutyl (meth) acrylate; hydroxypentyl (meth) acrylate; 2-hydroxy-3-phenoxypropyl (meth) acrylate; 2-hydroxy-3-butoxypropyl (meth) acrylate; 2-hydroxy-3-methoxypropyl (meth) acrylate; diethylene glycol mono (meth) acrylate; triethylene glycol mono (meth) acrylate; polyethylene glycol mono (meth) acrylate; dipropylene glycol mono (meth) acrylate; polypropylene glycol mono (meth) acrylate; glycerin mono (meth) acrylate; acryloyloxyethyl phthalate; 2-(meth) acryloyloxyethyl-2-hydroxyethyl phthalate; 2-(meth) acryloyloxypropyl phthalate; β-carboxyethyl (meth) acrylate; (meth) acrylic acid dimer; ω-carboxy-polycaprolactone mono (meth) acrylate; dimethylaminoethyl (meth) acrylate; diethylaminoethyl (meth) acrylate; N-vinylpyrrolidone; N-vinylformamide; (meth) acryloylmorpholine, etc. Examples of the polyfunctional monomer include bifunctional monomers such as 1,3-butylene glycol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,5-pentanediol di(meth)acrylate, 3-methyl-1,5-pentanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,8-octanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, tricyclodecane dimethanol di(meth)acrylate, ethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, and propylene glycol di(meth)acrylate, and polyfunctional monomers having three or more functional groups such as trimethylolpropane tri(meth)acrylate, glycerin triacrylate, ditrimethylolpropane tetra(meth)acrylate, pentaerythritol tetra(meth)acrylate, and dipentaerythritol hexa(meth)acrylate.

[0026] If necessary, various inert resins, colorants, extender pigments, polymerization initiators, solvents, and other additives can be used in the active energy ray-curable ink. In particular, it is preferable that the inert resin contains a rosin resin and / or a diallyl phthalate resin.

[0027] <Method for manufacturing a laminate> The laminate of the present invention has a paper, an aluminum layer, an anchor coat layer, and a printing layer in this order. As a method for manufacturing the laminate, first, the paper and an aluminum foil (aluminum layer) are laminated, then an anchor coat agent is applied to form an anchor coat layer, and then printing is performed to form a printing layer in this order. The lamination method of paper and aluminum foil is not particularly limited and can be carried out by various methods such as melt extrusion lamination with polyethylene, wet lamination, dry lamination, etc. The anchor coat application is carried out after the lamination of the paper substrate and the aluminum foil. However, for the purpose of preventing deterioration due to oxidation on the surface of the aluminum foil, it is desirable to carry out it as quickly as possible. After 72 hours, the improvement in adhesiveness is small and does not reach a practical level. As the application method of the anchor coat agent, a general gravure method can be used, but other methods can also be used. The anchor coat agent is baked for several seconds with hot air at a high temperature of about 150 °C after application. Finally, printing is carried out, but some or all of these processes may be carried out simultaneously in an in-line manner.

Examples

[0028] Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples. In the present invention, "parts" and "%" represent "parts by mass" and "mass%" unless otherwise noted.

[0029] <Acid value> The number of milligrams of potassium hydroxide required to neutralize the acidic components contained in 1 g of the resin. For vinyl chloride-vinyl acetate copolymer resin, it was calculated by potentiometric titration with a potassium hydroxide-ethanol solution according to the method described in JIS K0070.

[0030] <Weight average molecular weight> The weight average molecular weight was determined as the converted molecular weight using polystyrene as a standard substance by measuring the molecular weight distribution using a GPC (gel permeation chromatography) apparatus (HLC-8220 manufactured by Tosoh Corporation). The measurement conditions are shown below. Column: The following columns were connected in series and used. TSKgel SuperAW2500 manufactured by Tosoh Corporation TSKgel SuperAW3000 manufactured by Tosoh Corporation TSKgel SuperAW4000 manufactured by Tosoh Corporation TSKgel guardcolumn SuperAWH manufactured by Tosoh Corporation Detector: RI (Refractive Index Detector) Measurement Conditions: Column Temperature 40°C Eluent: Tetrahydrofuran Flow Rate: 1.0 mL / min

[0031] <Adjustment of Anchor Coating Agent> (Anchor Coating Agent 1 (AC Agent 1)) 12 parts of vinyl chloride-vinyl acetate copolymer resin A, 6.5 parts of polyester resin A, 41.5 parts of MEK (methyl ethyl ketone), and 40 parts of ethyl acetate were charged into a flask and heated to 50°C for dissolution to obtain AC Agent 1.

[0032] (Anchor Coating Agents 2 - 11 (AC Agents 2 - 11)) AC Agents 2 - 11 were adjusted in the same manner as AC Agent 1, except that the materials in Example 1 of the adjustment were replaced with those shown in Table 1.

[0033]

Table 1

[0034] The vinyl chloride-vinyl acetate copolymer resins and polyester resins described in Table 1 are as follows. · Vinyl chloride-vinyl acetate copolymer resin A: Solvaine M manufactured by Nisshin Chemical Industry Co., Ltd. (weight average molecular weight 69,000, glass transition temperature 70°C, acid value 5.8 mgKOH / g) · Vinyl chloride-vinyl acetate copolymer resin B: Solvaine C manufactured by Nisshin Chemical Industry Co., Ltd. (weight average molecular weight 75,000, glass transition temperature 70°C) · Vinyl chloride-vinyl acetate copolymer resin C: Solvaine A manufactured by Nisshin Chemical Industry Co., Ltd. (weight average molecular weight 73,000, glass transition temperature 74°C) · Polyester resin A: Vyron 300 manufactured by Toyobo Co., Ltd. (number average molecular weight 23,000, glass transition temperature 7°C) · Polyester resin B: Vyron 600 manufactured by Toyobo Co., Ltd. (number average molecular weight 16,000, glass transition temperature 47°C) ·Polyester resin C: Vylon 200 manufactured by Toyobo Co., Ltd. (number average molecular weight 17,000, glass transition temperature 67°C)

[0035] <Adjustment of varnish for offset ink> (Resin varnish OV1) The following raw materials were mixed in a state of being heat-dissolved at 100°C under an air stream to produce resin varnish OV1. Diallyl phthalate resin: 30 parts Ditrimethylolpropane tetraacrylate: 70 parts Hydroquinone: 0.1 part

[0036] (Resin varnish OV2) Resin varnish OV2 was produced in the same manner as resin varnish OV1, except that the raw materials and amounts described in Table 2-1 were changed.

[0037] Each of the raw materials described in Table 2-1 is as follows. Diallyl phthalate resin: Daiso Dap A (manufactured by Daiso Co., Ltd.) Rosin-modified alkyd resin: KG-7797 (manufactured by Arakawa Chemical Industries, Ltd.) Hydroquinone: Hydroquinone (manufactured by Seiko Chemical Co., Ltd.) In Tables 2 and 3, the diallyl phthalate resin is described as DAP, and the rosin-modified alkyd resin is described as rosin.

[0038]

Table 2-1

[0039] <Preparation of offset ink> (Offset ink OI1) The following raw materials were stirred and mixed using a butterfly mixer and dispersed with a three-roll mill to produce offset ink OI1. Resin varnish OV1: 42 parts Blue pigment: 17 parts Dipentaerythritol hexaacrylate: 15 parts Trimethylolpropane tetraacrylate: 11 parts Photoinitiator: 8 parts Extender pigment: 5 parts Additive: 2 parts

[0040] (Offset ink OI2, OI3) Offset inks OI2 and OI3 were produced in the same manner as offset ink OI1, except that the raw materials and amounts described in Table 2-2 were changed.

[0041] The respective raw materials described in Table 2-2 are as follows. Blue pigment: Lionol Blue FG7330 (C.I.Pigment Blue 15:4, Toyo Color Co., Ltd.) Photoinitiator: A mixture of the following four raw materials in the described parts by mass was used as the photoinitiator. OMNIRAD 907 (manufactured by IGM Resins): 3 parts OMNIRAD EMK (manufactured by IGM Resins): 2 parts OMNIRAD DETX (manufactured by IGM Resins): 1 part OMNIRAD 369 (manufactured by IGM Resins): 2 parts Extender pigment: Magnesium carbonate (manufactured by Tokuyama Corporation) Additive: Sunwax 161P (manufactured by Sanyo Chemical Industries, Ltd.)

[0042]

Table 2-2

[0043] <Lamination of paper and aluminum> Using a wet laminator, an adhesive (Konishi CN550N) was applied to the matte surface of soft aluminum with a thickness of 9 μm at a coating amount of 5 g / m 2 Subsequently, it was laminated with the glossy surface of pure white roll paper (Silver 50 g / m 2 manufactured by Nippon Paper Industries). Subsequently, it was dried in an oven at 150°C and wound up to obtain laminated paper A0.

[0044] <Formation of Anchor Coat Layer> On the aluminum surface of the laminated paper A0 with 0 hours elapsed since the lamination process, the anchor coat agents 1 to 11 were applied using a gravure coater, and then dried in an oven at 150°C to obtain the laminated papers A1 to 11 with the anchor coat applied. Similarly, on the aluminum surface of the laminated paper A0 that was stored in a wound state and for which 24 hours, 60 hours, and 84 hours had elapsed since the lamination process, the anchor coat agent 1 was applied using a gravure coater, then dried in an oven at 150°C and wound up to obtain the laminated papers A12 to 14 with the anchor coat applied. The operating conditions of the gravure coater are as follows. Printing machine: Gravure calibration machine Plate used: Etched 175 LPI · 35 μm solid plate Coating viscosity: Zahn cup #3 (manufactured by Reika Co., Ltd.) 17 seconds Dilution solvent: Toluene / ethyl acetate = 50 / 50 Printing speed: 50 m / min Drying conditions: 150°C oven, 5 seconds

[0045] <Formation of Printing Layer> On the surface of the obtained laminated papers A0 to 14 having an aluminum layer, the offset inks OI1 to 3 were color-developed, and ultraviolet irradiation was performed using an ultraviolet irradiation machine to obtain the printed matters P1 to P17. The various conditions for color development and ultraviolet irradiation are as follows. Color-developing machine: RI tester Color development amount: 0.0002 g / cm 2 Ultraviolet irradiation machine: Metal halide lamp irradiation device (manufactured by Eye Graphics Co., Ltd.) Irradiation output: 160 W / cm Irradiation distance: 10 mm Conveyor speed: 80 m / min For the obtained printed matters P1 to 17, the following physical property tests were conducted. The results are shown in Table 3.

[0046] (Adhesion) For the printed matters P1 to P17, immediately after forming the printing layer, a Nichiban cellophane tape with a width of 12 mm was attached for about 20 cm, rubbed 5 times with the thumb, and then peeled slowly until about half of the attached part and quickly for the rest. The degree of ink peeling was evaluated based on the area with respect to the entire area where the cellophane tape was attached. A value of 3 or more was considered practical. 5: No ink peeling at all. 4: There was no ink peeling in the slowly peeled part, and peeling of 25% or less was observed on the printed surface of the quickly peeled part. 3: There was no ink peeling in the slowly peeled part, and peeling exceeding 25% was observed on the printed surface of the quickly peeled part. 2: Peeling of 25% or less was observed even when peeled slowly. 1: Peeling exceeding 25% was observed even when peeled slowly.

[0047] (Blocking resistance) For the printed matters P1 to P17, immediately after forming the printing layer, after cutting into test pieces of 4 cm × 4 cm in size, the printed layer surface and the non-printed surface (the surface where the paper base material was exposed on the side opposite to the side where aluminum was laminated) were overlapped, and stored in 50°C and 80% RH for 24 hours under a pressure of 1 MPa applied to the entire area of the test piece. Then, the printed surface / non-printed surface was peeled, and the degree of ink transfer from the printed surface to the non-printed surface was evaluated based on the area. A value of 3 or more was considered practical. 5: No ink transfer. 4: Transfer exceeding 0% and 10% or less was observed. 3: Transfer exceeding 10% and 25% or less was observed. 2: Transfer exceeding 25% and 50% or less was observed. 1: Transfer exceeding 50% was observed.

[0048]

Table 3

[0049] From the results of Examples 1 to 14 above, by having an anchor coat layer formed from an anchor coat agent containing a vinyl chloride-vinyl acetate copolymer resin and a polyester resin, and having a glass transition temperature of the polyester resin of 60°C or lower, it has become possible to provide a printed matter with a metallic luster that has excellent adhesiveness while maintaining excellent blocking resistance. With the anchor coat agent of the present invention, it has become possible to create high-design packages in printing methods using active energy ray curing such as UV offset printing machines that are widely spread, and it is possible to greatly promote the paperization of packages.

Claims

1. An anchor coat agent for forming an anchor coat layer of a laminate having, in this order, a paper, an aluminum layer, an anchor coat layer, and a cured product of an active energy ray-curable ink, comprising a vinyl chloride-vinyl acetate copolymer resin and a polyester resin, wherein the glass transition temperature of the polyester resin is 60°C or lower, the anchor coat agent.

2. The anchor coat agent according to claim 1, wherein the vinyl chloride-vinyl acetate copolymer resin contains an acid group.

3. The anchor coat agent according to claim 1 or 2, wherein the glass transition temperature of the polyester resin is 20°C or lower.

4. The anchor coat agent according to claim 1 or 2, wherein the mass ratio of the vinyl chloride-vinyl acetate copolymer resin to the polyester resin is 60:40 to 85:

15.

5. A laminate having, in this order, a paper, an aluminum layer, an anchor coat layer formed from the anchor coat agent according to claim 1 or 2, and a cured product of an active energy ray-curable ink.

6. The laminate according to claim 5, wherein the thickness of the aluminum layer is 5 to 30 μm.

7. The laminate according to claim 5, wherein the printed layer contains a rosin resin and / or a diallyl phthalate resin.

8. A method for manufacturing the laminate according to claim 5, comprising: a step (A) of laminating a paper and an aluminum layer; a step (B) of laminating the aluminum layer and the anchor coat layer; a step (C) of laminating the anchor coat layer and the printed layer, and the step (B) is performed within 72 hours after the completion of the step (A). The method for manufacturing a laminate is characterized by this.

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