Latex ink film

Abstract

The present invention addresses the problem of providing a film for a latex ink, the film having a latex-ink-receiving layer having exceptional sticking resistance and ink adhesion. The aforementioned problem is solved by achieving a film for latex ink, the film having a laminate structure in which a latex-ink-receiving layer (X) and a base material (Y) are laminated, the latex-ink-receiving layer (X) being formed from a resin composition (x1) that contains an acrylic resin (A) having a cross-linkable functional group and a cross-linker (B), and the cross-linker (B) containing an aromatic polyisocyanate (B1).

Description

[Technical Field]

[0001] The present invention relates to a film for latex inks. [Background technology]

[0002] In recent years, printing methods using latex ink have been attracting attention (see, for example, Patent Document 1). Unlike solvent inks, which dissolve pigments in organic solvents, latex inks are water-based inks in which pigments are dispersed in water together with latex (a polymer). Therefore, unlike solvent inks, they do not emit volatile organic compounds (VOCs) that result from organic solvents, which is a problem when using solvent inks. Therefore, printed materials using latex inks have the advantage of being safe for use in a variety of locations, including restaurants, educational institutions, medical institutions, and commercial facilities.

[0003] Taking these advantages into consideration, the present applicant has proposed a film for latex ink in Patent Document 2. The film for latex ink described in Patent Document 2 comprises a substrate and a printing coating layer to which latex ink is applied. The printing coating layer contains a material having a structure in which a polymeric material whose constituent monomers are vinyl chloride, vinyl acetate, and a crosslinkable monomer is crosslinked by a crosslinking agent. This results in a film for latex ink having a printing coating layer that has excellent adhesion to both the area printed with latex ink and the substrate.

[0004] The "printing coating layer" in Patent Document 2 is referred to as the "latex ink-receiving layer" in this specification. That is, the "latex ink-receiving layer" refers to the layer to which latex ink is applied and has the function of fixing the printed portion of the applied latex ink. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-120719 [Patent Document 2] Japanese Patent Application Publication No. 2019-172877 Summary of the Invention [Problem to be solved by the invention]

[0006] In recent years, printing methods using latex inks have become widely adopted, and various requirements are increasing for the films for latex inks used in such methods. Furthermore, from the viewpoint of environmental protection, there is also a demand for the use of non-halogenated resins. Therefore, there is a need for the development of films for latex inks that have a latex ink-receiving layer different from that described in Patent Document 2.

[0007] Therefore, the present inventors investigated latex ink-receiving layers containing acrylic resins, which are highly versatile resins. However, they found that when a latex ink-receiving layer containing an acrylic resin is formed on the surface of a substrate and a laminate of the substrate and the latex ink-receiving layer is produced, the latex ink-receiving layer is likely to stick to the back surface of the substrate when the laminate is wound up. As a result, when the wound laminate is unwound, static electricity is generated and the surface of the latex ink-receiving layer becomes rough due to this sticking. Since static discharge and surface roughness can lead to printing defects, solving these problems is desirable from the perspective of improving the quality of films for latex inks. In the following description, "the property of suppressing sticking between the latex ink receiving layer and the back surface of the substrate, which occurs when a laminate of the substrate and the latex ink receiving layer is wound up in the process of forming a latex ink receiving layer containing an acrylic resin on the surface of the substrate" will also be simply referred to as "sticking resistance."

[0008] Furthermore, it has been found that when a latex ink-receiving layer containing an acrylic resin is used, it is not easy to ensure adhesion of the latex ink-receiving layer to the area printed with latex ink. In the following description, "adhesion to the printed portion using latex ink" will also be simply referred to as "ink adhesion."

[0009] Therefore, an object of the present invention is to provide a film for latex ink having a latex ink-receiving layer that is excellent in sticking resistance and ink adhesion. [Means for solving the problem]

[0010] As a result of intensive research aimed at solving the above-mentioned problems, the present inventors have discovered that a latex ink-receiving layer formed from a resin composition in which a specific crosslinking agent is blended with an acrylic resin having a crosslinkable functional group can solve the above-mentioned problems. Based on this discovery, the present inventors have conducted further research and have completed the present invention. That is, the present invention relates to the following [1] to

[11] . [1] A laminated structure in which a latex ink receiving layer (X) and a substrate (Y) are laminated, the latex ink-receiving layer (X) is formed from a resin composition (x1) containing an acrylic resin (A) having a crosslinkable functional group and a crosslinking agent (B); A film for latex ink, wherein the crosslinking agent (B) contains an aromatic polyisocyanate (B1). [2] The crosslinking agent (B) further contains an isocyanurate compound (B2), The isocyanurate compound (B2) includes an isocyanurate compound (B2-1) and a modified isocyanurate compound (B2-2), The isocyanurate compound (B2-1) is a trimer of 1,6-hexamethylene diisocyanate, The film for latex ink according to the above [1], wherein the modified isocyanurate compound (B2-2) is a trimer of 1,6-hexamethylene diisocyanate and has one or more tertiary amino groups. [3] The film for latex ink according to [1] or [2] above, wherein the substrate (Y) contains a polyester resin. [4] The latex ink-receiving layer (X) is laminated on one surface of the substrate (Y), The film for latex ink according to any one of the above [1] to [3], wherein a pressure-sensitive adhesive layer (Z) is provided on the other surface of the substrate (Y). [5] The film for latex ink according to [4] above, wherein the adhesive surface of the adhesive layer (Z) is covered with a release liner. [6] The film for latex ink according to any one of [1] to [5] above, wherein the content of the aromatic polyisocyanate (B1) relative to 100 parts by mass of the acrylic resin (A) having a crosslinkable functional group is 7.0 parts by mass or more. [7] The film for latex ink according to any one of the above [1] to [6], wherein the content of the aromatic polyisocyanate (B1) is less than 24.2 parts by mass per 100 parts by mass of the acrylic resin (A) having a crosslinkable functional group. [8] The film for latex ink according to any one of [1] to [7] above, which is used for printing using latex ink containing an acrylic resin. [9] A method of using the film for latex ink according to any one of [1] to [7] above, to form a printed portion on the latex ink-receiving layer of the film for latex ink using latex ink.

[10] A method for producing a printed matter, comprising the step of forming a printed portion using latex ink on the latex ink-receiving layer of the film for latex ink according to any one of [1] to [7] above.

[11] A printed matter having a printed area printed with latex ink on the latex ink-receiving layer of the film for latex ink according to any one of [1] to [7] above. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a film for latex ink having a latex ink-receiving layer that is excellent in sticking resistance and ink adhesion. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a cross-sectional view showing one embodiment of a film for latex ink of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] In this specification, the term "active ingredient" refers to the components contained in the target composition, excluding diluent solvents such as water and organic solvents. In addition, in this specification, "(meth)acrylic acid" refers to both "acrylic acid" and "methacrylic acid", and the same applies to other similar terms. Furthermore, in this specification, for preferred numerical ranges (e.g., ranges of content, etc.), the lower and upper limits described in stages can be independently combined. For example, the description "preferably 10 to 90, more preferably 30 to 60" can be combined with the "preferable lower limit (10)" and the "more preferable upper limit (60)" to form "10 to 60." In this specification, the numerical values ​​in the examples are numerical values ​​that can be used as upper or lower limit values.

[0014] [Embodiments of the film for latex ink of the present invention] The film for latex ink of the present invention has a laminated structure in which a latex ink-receiving layer (X) and a substrate (Y) are laminated together. The latex ink receiving layer (X) is formed from a resin composition (x1) containing an acrylic resin (A) having a crosslinkable functional group and a crosslinking agent (B). The crosslinking agent (B) contains an aromatic polyisocyanate (B1).

[0015] As a result of extensive investigations, the present inventors have found that a latex ink-receiving layer formed from a resin composition (x1) containing "an acrylic resin (A) having a crosslinkable functional group" and "a crosslinking agent (B) containing an aromatic polyisocyanate (B1)" has excellent sticking resistance and ink adhesion, and have completed the present invention through further extensive investigations.

[0016] The latex ink film of the present invention will be described in detail below with respect to its configuration, the components constituting the latex ink film (substrate, latex ink-receiving layer, adhesive layer, and release liner), the method for producing the latex ink film, and uses of the latex ink film.

[0017] [Latex ink film composition] The film for latex ink of the present invention has a laminated structure in which a latex ink-receiving layer (X) and a substrate (Y) are laminated together.

[0018] A cross-sectional schematic diagram of one embodiment of the film for latex ink of the present invention is shown in Figure 1. The film for latex ink 1 shown in Figure 1 has a laminated structure in which a latex ink-receiving layer (X) is laminated on one surface (Ya) of a substrate (Y). 1, the film for latex ink according to one embodiment of the present invention preferably has a pressure-sensitive adhesive layer (Z) provided on the other surface (Yb) of the substrate (Y), which allows the film for latex ink to be suitably used as a pressure-sensitive adhesive film.

[0019] Although not shown, the adhesive surface of the pressure-sensitive adhesive layer (Z) may be covered with a release liner, which may be peeled off when the pressure-sensitive adhesive layer (Z) is attached to an adherend, to expose the adhesive surface of the pressure-sensitive adhesive layer (Z). Although not shown in the figure, a latex ink receiving layer (X) may be provided on both the one surface (Ya) and the other surface (Yb) of the substrate (Y) without providing the adhesive layer (Z).

[0020] [Components that make up latex ink film] The film for latex ink of the present invention has a latex ink-receiving layer (X) and a substrate (Y). As described above, the film for latex ink according to one embodiment of the present invention may further include a pressure-sensitive adhesive layer (Z) in addition to the latex ink-receiving layer (X) and the substrate (Y). Alternatively, the film for latex ink according to one embodiment of the present invention may further include a pressure-sensitive adhesive layer (Z) and a release liner in addition to the latex ink-receiving layer (X) and the substrate (Y). The latex ink-receiving layer (X), the substrate (Y), the pressure-sensitive adhesive layer (Z), and the release liner will be described in detail below.

[0021] <Latex ink receiving layer (X)> The film for latex ink of the present invention has a latex ink-receiving layer (X). The latex ink receiving layer (X) is the portion to which latex ink is applied, and has the function of fixing the printed portion of the applied latex ink. The thickness of the latex ink receiving layer (X) is not particularly limited, but is preferably 0.05 μm to 50 μm, more preferably 0.1 μm to 25 μm, and even more preferably 0.1 μm to 10 μm.

[0022] The latex ink-receiving layer (X) is formed from a resin composition (x1) containing an acrylic resin (A) having a crosslinkable functional group and a crosslinking agent (B). The crosslinking agent (B) contains an aromatic polyisocyanate (B1).

[0023] In the following description, the "acrylic resin (A) having a crosslinkable functional group" and the "crosslinking agent (B)" will also be referred to as "component (A)" and "component (B)", respectively.

[0024] In one embodiment of the present invention, the resin composition (x1) that is the material for forming the latex ink-receiving layer (X) may consist solely of component (A) and component (B), or may contain components other than component (A) and component (B) in addition to component (A) and component (B) to the extent that the effects of the present invention are not impaired. Examples of such components include additives for ink-receiving layers that are commonly used in ink-receiving layers such as latex ink-receiving layers, such as reaction accelerators (catalysts), surface conditioners, plasticizers, ultraviolet absorbers, light stabilizers, fillers, and colorants.

[0025] In one embodiment of the present invention, the total content of component (A) and component (B) is preferably 80% by mass to 100% by mass, more preferably 85% by mass to 100% by mass, even more preferably 90% by mass to 100% by mass, and still more preferably 95% by mass to 100% by mass, based on the total amount of active ingredients in resin composition (x1).

[0026] The acrylic resin (A) having a crosslinkable functional group and the crosslinking agent (B) contained in the resin composition (x1) will be described in detail below.

[0027] (Acrylic resin (A) having crosslinkable functional groups) The resin composition (x1) used in the present invention contains an acrylic resin (A) having a crosslinkable functional group. It is presumed that the inclusion of the acrylic resin (A) having a crosslinkable functional group in the resin composition (x1) used in the present invention results in a crosslinked structure formed by a reaction with the aromatic polyisocyanate (B1) described below, which improves sticking resistance and is suitable for improving ink adhesion, thereby achieving the effects of the present invention.

[0028] The acrylic resin (A) having a crosslinkable functional group is preferably an acrylic resin (A1) having a structural unit (a1) derived from a crosslinkable functional group-containing monomer (a1') (hereinafter also referred to as monomer (a1')).

[0029] Examples of the crosslinkable functional group contained in the monomer (a1') include one or more groups selected from the group consisting of a hydroxyl group, a carboxyl group, an amino group, and an epoxy group. That is, examples of the monomer (a1') include hydroxyl group-containing monomers, carboxyl group-containing monomers, amino group-containing monomers, and epoxy group-containing monomers, etc. Also included are monomers containing two or more crosslinkable functional groups selected from hydroxyl groups, carboxyl groups, amino groups, and epoxy groups, etc. These monomers (a1') may be used singly or in combination of two or more. Among these, hydroxyl group-containing monomers and carboxy group-containing monomers are preferred as the monomer (a1').

[0030] Examples of hydroxyl group-containing monomers include hydroxyalkyl (meth)acrylates such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate; N-methylol acrylamide; ε-caprolactone-modified hydroxy(meth)acrylate; and carbonate-modified (meth)acrylate.

[0031] Examples of the carboxyl group-containing monomer include (meth)acrylic acid; and compounds obtained by reacting the terminal hydroxyl group of the hydroxyl group-containing monomer described above with an acid anhydride such as one or more aliphatic dicarboxylic acids selected from succinic anhydride, glutaric anhydride, and the like.

[0032] Here, the acrylic resin (A) having a crosslinkable functional group may be an acrylic copolymer (A2) having a structural unit (a2) derived from an alkyl (meth)acrylate (a2') (hereinafter also referred to as "monomer (a2')") together with the crosslinkable functional group-containing monomer (a1').

[0033] The number of carbon atoms in the alkyl group of the monomer (a2') is preferably 1 to 24. From the viewpoint of adjusting the glass transition temperature (Tg) of the acrylic resin (A) within an appropriate range and making it easier to exhibit the effects of the present invention, the number of carbon atoms in the alkyl group is preferably 2 to 20. The alkyl group contained in the monomer (a2') may be a linear alkyl group or a branched alkyl group.

[0034] Examples of the monomer (a2') include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, tert-butyl (meth)acrylate, n-pentyl (meth)acrylate, n-hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, lauryl (meth)acrylate, tridecyl (meth)acrylate, and stearyl (meth)acrylate. These monomers (a2') may be used singly or in combination of two or more.

[0035] In the acrylic copolymer (A2) containing the structural unit (a2), the content of the structural unit (a2) is preferably 1 to 99 mass%, more preferably 5 to 95 mass%, and even more preferably 10 to 90 mass%, based on the total amount of the acrylic copolymer (A2).

[0036] The acrylic resin (A1) and the acrylic copolymer (A2) may be an acrylic copolymer (A3) further having a structural unit (a3) ​​derived from a monomer (a3') other than the monomers (a1') and (a2').

[0037] Examples of the monomer (a3') include olefins such as ethylene, propylene, and isobutylene; halogenated olefins such as vinyl chloride and vinylidene chloride; diene monomers such as butadiene, isoprene, and chloroprene; (meth)acrylates having a cyclic structure such as cyclohexyl (meth)acrylate, benzyl (meth)acrylate, isobornyl (meth)acrylate, dicyclopentanyl (meth)acrylate, dicyclopentenyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, and imide (meth)acrylate; styrene, α-methylstyrene, vinyltoluene, vinyl formate, vinyl acetate, acrylonitrile, (meth)acrylamide, (meth)acrylonitrile, (meth)acryloylmorpholine, and N-vinylpyrrolidone.

[0038] In the acrylic copolymer (A3) containing the structural unit (a3), the content of the structural unit (a3) ​​is preferably 1 to 99 mass%, more preferably 5 to 95 mass%, and even more preferably 10 to 90 mass%, based on the total amount of the acrylic copolymer (A3).

[0039] The molecular weight of the acrylic resin (A) having a crosslinkable functional group is not particularly limited, but the number average molecular weight is preferably 3,000 to 100,000. The number average molecular weight is a polystyrene-equivalent value measured by gel permeation chromatography (GPC) using a differential refractometer.

[0040] The hydroxyl value of the acrylic resin (A) having a crosslinkable functional group is preferably 5.0 mgKOH / g to 25.0 mgKOH / g, more preferably 6.0 mgKOH / g to 24.0 mgKOH / g, and even more preferably 7.0 mgKOH / g to 23.0 mgKOH / g. When the hydroxyl value of the acrylic resin (A) having a crosslinkable functional group is at least the above lower limit, ink adhesion is likely to be improved, and the stability of the latex ink-receiving layer is likely to be improved. When the hydroxyl value of the acrylic resin (A) having a crosslinkable functional group is equal to or less than the upper limit, the stability of the coating liquid (a solution containing the resin composition (x)) used to form the latex ink-receiving layer (X) is easily improved, and shrinkage curl caused by cure shrinkage of the latex ink-receiving layer (X) due to dense crosslinking is easily suppressed. In this specification, the hydroxyl value of the acrylic resin (A) having a crosslinkable functional group means a value measured in accordance with JIS K0070:1992.

[0041] The acid value of the acrylic resin (A) having a crosslinkable functional group is preferably 10.0 mgKOH / g or less, more preferably 1.0 mgKOH / g to 9.0 mgKOH / g, and even more preferably 2.0 mgKOH / g to 8.0 mgKOH / g. In this specification, the acid value of the acrylic resin (A) having a crosslinkable functional group means a value measured in accordance with JIS K0070:1992.

[0042] From the viewpoint of further improving ink adhesion, the glass transition temperature (Tg) of the acrylic resin (A) having a crosslinkable functional group is preferably 100° C. or lower, more preferably 95° C. or lower, and even more preferably 90° C. or lower. In particular, when the glass transition temperature (Tg) of the acrylic resin (A) having a crosslinkable functional group is lower than the curing temperature of the latex ink, ink adhesion is more likely to be improved. The glass transition temperature (Tg) of the acrylic resin (A) having a crosslinkable functional group is usually 30°C or higher, preferably 40°C or higher, and more preferably 50°C or higher, from the viewpoint of further improving the sticking resistance. In this specification, the glass transition temperature (Tg) of the acrylic resin (A) having a crosslinkable functional group refers to a value measured in accordance with JIS K 7121:1987 using a differential scanning calorimeter (manufactured by TA Instruments Japan, product name "DSC Q2000") at a heating rate of 20°C / min.

[0043] The content of the acrylic resin (A) having a crosslinkable functional group is not particularly limited as long as the effects of the present invention are exhibited, but is preferably 60.0 mass% or more, more preferably 65.0 mass% or more, and even more preferably 70.0 mass% or more, based on the total amount of the active ingredients of the resin composition (x1), and is preferably 93.0 mass% or less, more preferably 92.5 mass% or less, and even more preferably 92.0 mass% or less.

[0044] (Crosslinking agent (B)) The resin composition (x1) used in the present invention contains a crosslinking agent (B). The crosslinking agent (B) comprises an aromatic polyisocyanate (B1). If the crosslinking agent (B) does not contain an aromatic polyisocyanate (B1), the latex ink-receiving layer (X) will not have good sticking resistance and ink adhesion. In the present invention, by using a crosslinking agent (B) containing an aromatic polyisocyanate (B1), the crosslinking reaction is likely to occur quickly when a coating film of the resin composition (x1) is formed on the substrate (Y). Furthermore, the crosslinked structure formed by the reaction with the acrylic resin (A) having a crosslinkable functional group provides the latex ink-receiving layer (X) with an appropriate hardness. Therefore, it is presumed that the latex ink-receiving layer (X) has excellent sticking resistance. It is also presumed that the crosslinked structure formed by the reaction with the acrylic resin (A) having a crosslinkable functional group contributes to ink adhesion, resulting in excellent adhesion.

[0045] The crosslinking agent (B) may contain only the aromatic polyisocyanate (B1), but may also contain a crosslinking agent other than the aromatic polyisocyanate (B1) as long as the effects of the present invention are not impaired. In one embodiment of the present invention, from the viewpoint of making it easier to improve sticking resistance, ink adhesion, and water abrasion resistance, it is preferable that the crosslinking agent (B) further contains an isocyanurate compound (B2). A film for latex ink having a latex ink-receiving layer with excellent water abrasion resistance can prevent the printed area from peeling off during wet application.

[0046] In one embodiment of the present invention, when the crosslinking agent (B) contains an aromatic polyisocyanate (B1) but does not contain an isocyanurate compound (B2), the content of the aromatic polyisocyanate (B1) is preferably 80% by mass to 100% by mass, more preferably 90% by mass to 100% by mass, and even more preferably 95% by mass to 100% by mass, based on the total amount of the crosslinking agent (B). In one embodiment of the present invention, when the crosslinking agent (B) contains an aromatic polyisocyanate (B1) and an isocyanurate compound (B2), the total content of the aromatic polyisocyanate (B1) and the isocyanurate compound (B2) is preferably 80% by mass to 100% by mass, more preferably 90% by mass to 100% by mass, and even more preferably 95% by mass to 100% by mass, based on the total amount of the crosslinking agent (B).

[0047] The aromatic polyisocyanate (B1) and the isocyanurate compound (B2) will be described in detail below.

[0048] (Aromatic polyisocyanate (B1)) The crosslinking agent (B) comprises an aromatic polyisocyanate (B1). The aromatic polyisocyanate (B1) is a compound having an aromatic ring and two or more isocyanate groups. Because the aromatic polyisocyanate (B1) has an isocyanate group bonded to an aromatic ring, which is an electron-withdrawing group, the reactivity of the isocyanate group is very high, and the crosslinking reaction tends to occur quickly. Furthermore, the crosslinked structure formed by the reaction with the acrylic resin (A) having a crosslinkable functional group provides the latex ink-receiving layer (X) with an appropriate hardness. Therefore, it is believed that the latex ink-receiving layer (X) can have excellent sticking resistance. It is also believed that the crosslinked structure formed by the reaction with the acrylic resin (A) having a crosslinkable functional group contributes to the adhesion of the latex ink-printed portion, ensuring excellent adhesion.

[0049] Here, in the aromatic polyisocyanate (B1), the aromatic ring and the isocyanate group may be bonded directly or via a linker such as an alkylene group. However, from the viewpoint of further increasing the reactivity of the aromatic polyisocyanate (B1), making the crosslinking reaction more likely to occur rapidly, and further improving the sticking resistance of the latex ink receiving layer (X), it is preferable that the aromatic ring and the isocyanate group are bonded directly or via a methylene group, and it is more preferable that they are bonded directly. The aromatic polyisocyanate (B1) may have two or more isocyanate groups, preferably two to three, and more preferably two.

[0050] Examples of the aromatic polyisocyanate (B1) include 1,3-phenylene diisocyanate, 4,4'-diphenyl diisocyanate, 1,4-phenylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-toluidine diisocyanate, 2,4,6-triisocyanate toluene, 1,3,5-triisocyanate benzene, dianisine diisocyanate, 2,4,6-triisocyanate toluene, 1,3,5-triisocyanate benzene, dianisine diisocyanate, 2,4,6-triisocyanate toluene, 2,4,6-triisocyanate toluene, 2,4,6-triisocyanate toluene, dianisine diisocyanate ... Examples of the isocyanate include dimethylbenzene, 4,4'-diphenyl ether diisocyanate, 4,4',4"-triphenylmethane triisocyanate, ω,ω'-diisocyanate-1,3-dimethylbenzene, ω,ω'-diisocyanate-1,4-dimethylbenzene, ω,ω'-diisocyanate-1,4-diethylbenzene, 1,4-tetramethylxylylene diisocyanate, and 1,3-tetramethylxylylene diisocyanate.

[0051] The aromatic polyisocyanate (B1) may be, for example, an adduct with a polyol, a biuret, an allophanate, or a trimer, among which an adduct with a polyol is preferred, and an adduct with trimethylolpropane is more preferred. Examples of the adduct with trimethylolpropane include trimethylolpropane adduct tolylene diisocyanate and trimethylolpropane adduct xylylene diisocyanate.

[0052] Commercially available aromatic polyisocyanates (B1) include, for example, "Coronate L" (trimethylolpropane adduct tolylene diisocyanate, Tosoh Corporation) and "Takenate D-110N" (trimethylolpropane adduct xylylene diisocyanate, Mitsui Chemicals, Inc.).

[0053] The aromatic polyisocyanate (B1) may be used alone or in combination of two or more.

[0054] (Isocyanurate Compound (B2)) The crosslinking agent (B) preferably contains an isocyanurate compound (B2) together with the aromatic polyisocyanate (B1). The isocyanurate compound (B2) includes an isocyanurate compound (B2-1) and a modified isocyanurate compound (B2-2). The total content of the isocyanurate compound (B2-1) and the modified isocyanurate compound (B2-2) in the isocyanurate compound (B2) is preferably 80% by mass to 100% by mass, more preferably 90% by mass to 100% by mass, and even more preferably 95% by mass to 100% by mass, based on the total amount of the isocyanurate compound (B2), from the viewpoint of making it easier to improve sticking resistance, ink adhesion, and water abrasion resistance.

[0055] -Isocyanurate compound (B2-1)- The isocyanurate compound (B2) includes an isocyanurate compound (B2-1). The isocyanurate compound (B2-1) is a trimer of 1,6-hexamethylene diisocyanate, and specifically, is a compound of the following formula (1). [ka]

[0056] -Isocyanurate compound (B2-2)- The isocyanurate compound (B2) includes a modified product (B2-2) of an isocyanurate compound. The modified isocyanurate compound (B2-2) is a trimer of 1,6-hexamethylene diisocyanate and has one or more tertiary amino groups.

[0057] An example of a method for introducing one or more tertiary amino groups into the compound of formula (1) to form a modified product is to react the compound of formula (1) with a modifying agent having a hydroxyl group and a tertiary amino group. Examples of such denaturing agents include N,N-dimethylaminohexanol (e.g., Kao Corporation, Kao Raiser No. 25), N,N-dimethylaminoethoxyethoxyethanol (e.g., Kao Corporation, Kao Raiser No. 23NP), N,N-dimethylaminoethoxyethanol (e.g., Kao Corporation, Kao Raiser No. 26), N,N,N'-trimethylaminoethylethanolamine (e.g., Tosoh Corporation, TOYOCAT RX5), 2-[[3-(dimethylamino)propyl]methylamino]ethanol (e.g., Evónik, POLYCAT 17), and N,N-dimethylethanolamine (e.g., Huntsman, JEFFCAT DMEA). The modifier may have a ring structure, but is preferably a compound as described above that does not have a ring structure. The modifier is preferably an organic nonmetallic compound as described above that does not contain a metal element. That is, the modifier is preferably an acyclic organic nonmetallic compound that has a hydroxyl group and a tertiary amino group.

[0058] The reaction of the compound of formula (1) with the modifier is preferably carried out, for example, by placing the compound of formula (1) and the modifier in a nitrogen-substituted reaction vessel and stirring at a reaction temperature of 60°C to 100°C for 1 hour to 5 hours.

[0059] -Preparation of isocyanurate compound (B2)- The isocyanurate compound (B2) can be prepared, for example, by appropriately adjusting the ratio of the amounts of the compound of formula (1) and the modifier added to a reaction vessel when the compound of formula (1) and the modifier are reacted. The proportion of the modifier added to the compound of formula (1) is preferably 0.01 to 10 parts by mass, more preferably 0.05 to 5 parts by mass, per 100 parts by mass of the compound of formula (1). As a result, only a portion of the many compounds of formula (1) have one or more tertiary amino groups, and an isocyanurate compound (B2) containing an isocyanurate compound (B2-1) and a modified product (B2-2) of the isocyanurate compound can be prepared. The content of the modified isocyanurate compound (B2-2) is preferably 0.5 mol % to 10 mol %, more preferably 1 mol % to 5 mol %, based on the total amount of the isocyanurate compound (B2).

[0060] (Aromatic polyisocyanate (B1) content) From the viewpoint of improving sticking resistance and ink adhesion, the content of the aromatic polyisocyanate (B1) relative to 100 parts by mass of the acrylic resin (A) having a crosslinkable functional group is preferably 7.0 parts by mass or more, more preferably 8.0 parts by mass or more, and even more preferably 9.0 parts by mass or more, and is preferably 30 parts by mass or less. From the viewpoint of improving bending resistance, the amount is preferably less than 24.2 parts by mass, more preferably 20.0 parts by mass or less, even more preferably 15.0 parts by mass or less, and even more preferably 10.0 parts by mass or less. Because the film for latex ink has excellent resistance to folding, it is possible to suppress whitening and other problems that occur when the film for latex ink is folded, and the appearance of the film for latex ink on which the printed portion is formed can be maintained in good condition.

[0061] (Isocyanurate compound (B2) content) When the crosslinking agent (B) contains an isocyanurate compound (B2), the content of the isocyanurate compound (B2) relative to 100 parts by mass of the acrylic resin (A) having a crosslinkable functional group is preferably 1.0 part by mass or more, more preferably 3.0 parts by mass or more, even more preferably 5.0 parts by mass or more, and even more preferably 7.0 parts by mass or more, from the viewpoint of further improving sticking resistance, ink adhesion, and water abrasion resistance. Also, it is preferably 25.0 parts by mass or less, more preferably 22.0 parts by mass or less, and even more preferably 20.0 parts by mass or less.

[0062] (Total content of aromatic polyisocyanate (B1) and isocyanurate compound (B2)) When the crosslinking agent (B) contains an isocyanurate compound (B2), the total content of the aromatic polyisocyanate (B1) and the isocyanurate compound (B2) relative to 100 parts by mass of the acrylic resin (A) having a crosslinkable functional group is preferably 8.0 parts by mass or more, more preferably 11.0 parts by mass or more, even more preferably 14.0 parts by mass or more, and still more preferably 16.0 parts by mass or more, from the viewpoint of making it easier to improve sticking resistance, ink adhesion, and water abrasion resistance. Furthermore, from the viewpoint of improving bending resistance, the amount is preferably 41.4 parts by mass or less, more preferably 28.0 parts by mass or less, and even more preferably 20.0 parts by mass or less.

[0063] (Ratio of aromatic polyisocyanate (B1) to isocyanurate compound (B2)) When the crosslinking agent (B) contains an isocyanurate compound (B2), the content ratio of the aromatic polyisocyanate (B1) to the isocyanurate compound (B2) [(B1) / (B2)] is preferably 0.2 to 5.0, more preferably 0.3 to 3.0, and even more preferably 0.5 to 2.0, in terms of mass ratio, from the viewpoint of making it easier to improve sticking resistance, ink adhesion, and water abrasion resistance.

[0064] <Base material (Y)> The film for latex ink of the present invention has a substrate (Y). The substrate (Y) supports the latex ink receiving layer (X) and also functions as a support for supporting the printed portion formed on the latex ink receiving layer (X).

[0065] The substrate (Y) is not particularly limited, but is preferably a resin film. The substrate (Y) being a resin film improves the rigidity and flexibility of the film for latex ink, improving the ease of handling of the film for latex ink. This is also advantageous from the viewpoint of reducing the production cost and weight of the film for latex ink.

[0066] Here, the substrate (Y) is preferably a transparent resin film. By using the substrate (Y) as a transparent resin film, a printed matter having a printed portion formed on the latex ink-receiving layer of the film for latex ink can be suitably used as glass decoration in stores, showrooms, offices, etc.

[0067] Examples of resins that may be used to form the resin film include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; polyolefin resins such as polyethylene and polypropylene; polystyrene; acrylonitrile-butadiene-styrene copolymer; cellulose triacetate; polycarbonate; urethane resins such as polyurethane and acrylic-modified polyurethane; polymethylpentene; polysulfone; polyether ether ketone; polyether sulfone; polyphenylene sulfide; polyimide resins such as polyetherimide and polyimide; polyamide resins; acrylic resins; and fluorine-based resins. Among these, from the viewpoint of easily improving the adhesion between the latex ink-receiving layer (X) and the substrate (Y), polyester-based resins and polyolefin-based resins are preferred, polyester-based resins are more preferred, and polyethylene terephthalate is even more preferred. According to the present invention, the adhesion between the latex ink-receiving layer (X) and the substrate (Y) constituting the latex ink film is sufficiently ensured while the film has excellent sticking resistance, so that when the front surface of the latex ink-receiving layer (X) comes into contact with the back surface of the substrate (Y) during winding or the like, sticking of the latex ink-receiving layer (X) to the back surface of the substrate (Y) is suppressed. Therefore, the occurrence of roughness on the surface of the latex ink-receiving layer (X) due to such sticking is suppressed.

[0068] The resin film may be composed of only one type of resin, or may be composed of two or more types of resin. When the resin film is composed of two or more types of resin, it is preferably a multi-layered film. Furthermore, the uppermost layer of the multi-layered film (the layer in contact with the latex ink-receiving layer) is preferably a polyester resin, more preferably polyethylene terephthalate, from the viewpoint of easily improving the adhesion between the latex ink-receiving layer (X) and the substrate (Y).

[0069] The resin film may be unstretched or may be stretched uniaxially, such as longitudinally or transversely, or biaxially.

[0070] In addition, the resin film may contain, together with these resins, additives for the substrate, such as a surface conditioner, a plasticizer, an ultraviolet absorber, a light stabilizer, and a colorant. The content of the additive for the substrate is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 3% by mass or less, based on the total amount of the substrate (Y).

[0071] The thickness of the substrate is not particularly limited, but is preferably 15 μm to 300 μm, and more preferably 30 μm to 200 μm.

[0072] <Adhesive layer (Z)> The film for latex ink according to one embodiment of the present invention may have a pressure-sensitive adhesive layer (Z). The film for latex ink according to one embodiment of the present invention has the pressure-sensitive adhesive layer (Z), and therefore the film for latex ink can be suitably used as a pressure-sensitive adhesive film.

[0073] The adhesive constituting the adhesive layer is not particularly limited, and examples thereof include acrylic adhesives, urethane adhesives, and silicone adhesives.

[0074] The thickness of the adhesive layer (Z) is not particularly limited, but from the viewpoint of improving the handleability when using the film for latex ink as an adhesive film, it is preferably 5 μm to 100 μm, more preferably 10 μm to 70 μm, and even more preferably 15 μm to 50 μm.

[0075] <Release liner> The film for latex ink of one embodiment of the present invention may have a release liner together with the pressure-sensitive adhesive layer (Z). By covering the adhesive surface of the adhesive layer (Z) of one embodiment of the latex ink film of the present invention with a release liner, the adhesive surface of the adhesive layer (Z) can be suitably protected during transportation and storage of the latex ink film.

[0076] The release liner is not particularly limited, and any release liner commonly used in the field of pressure-sensitive adhesive films can be used as appropriate. Examples of release liners include laminates in which a release layer is provided on the surface of a film or paper substrate. Examples of the film substrate include polyester resins such as polyethylene terephthalate, and polyolefin resins such as polyethylene resin and polypropylene resin. Examples of the paper substrate include fine paper, kraft paper, and glassine paper. Examples of materials that can be used to form the release layer include silicone resins, long-chain alkyl resins, and fluorine resins.

[0077] The thickness of the release liner is not particularly limited, but is preferably 10 μm to 200 μm, more preferably 15 μm to 150 μm, and even more preferably 20 μm to 120 μm.

[0078] [Latex ink film manufacturing method] The method for producing the film for latex ink of the present invention is not particularly limited, and may be appropriately selected depending on the configuration of the film for latex ink.

[0079] <Method of forming latex ink receiving layer (X)> A preferred method for forming the latex ink receiving layer (X) is to apply the resin composition (x1) to one surface (Ya) of the substrate (Y) to form a coating film, dry the coating film, and then crosslink the coating film to form the latex ink receiving layer (X). In order to improve the workability of application to the substrate (Y), the resin composition (x1) is preferably further diluted with a dilution solvent to form a solution.

[0080] Examples of dilution solvents include organic solvents such as methyl ethyl ketone, acetone, ethyl acetate, tetrahydrofuran, dioxane, cyclohexane, n-hexane, toluene, xylene, n-propanol, and isopropanol. The concentration of the active ingredient in the solution of the resin composition (x1) is preferably 10 to 50% by mass.

[0081] Examples of methods for applying the solution of the resin composition (x1) include Mayer bar coating, gravure coating, roll coating, knife coating, and die coating.

[0082] The heating conditions for drying the coating film are not particularly limited, and may be, for example, a drying temperature of 60° C. to 120° C. and a drying time of 30 seconds to 3 minutes. The crosslinking conditions are not particularly limited, and for example, the crosslinking may be carried out by leaving the composition in a normal environment (e.g., 23°C, relative humidity 50°C) for 1 to 14 days, or by leaving the composition in an environment of 40 to 60°C for 1 to 3 days. The drying step and the crosslinking step may also be carried out together.

[0083] <Method for forming pressure-sensitive adhesive layer (Z)> When the film for latex ink of one embodiment of the present invention has an adhesive layer (Z), the adhesive layer (Z) is formed on the other surface (Yb) of the substrate (Y) on which the latex ink receiving layer (X) is not formed. The pressure-sensitive adhesive layer (Z) is formed, for example, by applying a composition for forming the pressure-sensitive adhesive layer (Z) (pressure-sensitive adhesive layer-forming composition) to the other surface (Yb) of the substrate (Y). Alternatively, the pressure-sensitive adhesive layer (Z) may be formed by applying the pressure-sensitive adhesive layer-forming composition to the release surface of a release liner, and then the pressure-sensitive adhesive layer (Z) may be laminated (transferred) to the other surface (Yb) of the substrate (Y). The method for applying the composition for forming a pressure-sensitive adhesive layer is the same as that described above for the resin composition (x1).

[0084] [Applications of latex ink film] The film for latex ink of the present invention is preferably used for printing using latex ink. Therefore, the present invention provides a method of using the latex ink-compatible film to form a printed portion on the latex ink-receiving layer of the latex ink-compatible film using latex ink. The present invention also provides a method for producing a printed matter, which includes a step of forming a printed portion on the latex ink-receiving layer of the film for latex ink using latex ink. Furthermore, according to the present invention, there is provided a printed matter having a printed portion printed with latex ink on the latex ink-receiving layer of the film for latex ink.

[0085] Below, we will explain the latex ink used to form a printed area on the latex ink-receiving layer of the latex ink film of the present invention, and then we will explain the method for forming a printed area on the latex ink-receiving layer of the latex ink film of the present invention.

[0086] <Latex ink> Latex ink contains a liquid dispersion medium and a dispersoid made of a material containing at least a resin, which is dispersed (emulsified and / or suspended) in the dispersion medium. Latex inks have a low environmental impact. Another advantage of latex inks is that they can produce deep colors with a thin layer. The latex particles that make up latex inks contain a binder (resin), which generally has the advantage of improving the adhesion of pigment colorants to recording media. Another advantage is that they can be printed on demand using the inkjet method. Furthermore, the latex ink is preferably a water-based ink, which is safer and places less strain on the environment because it suppresses the generation of volatile organic substances resulting from organic solvents.

[0087] (resin) The resin contained in the latex ink is not particularly limited, but examples thereof include vinyl resins, acrylic resins, styrene resins, alkyd resins, polyester resins, polyurethane resins, silicone resins, fluorine resins, epoxy resins, phenoxy resins, polyolefin resins, and modified resins thereof (e.g., modified resins modified to be water-soluble), and one or more selected from these may be used in combination. Among these, acrylic resins, styrene resins, water-soluble polyurethane resins, water-soluble polyester resins, and water-soluble acrylic resins are preferred, with acrylic resins being more preferred. The latex ink used in the film for latex ink of one embodiment of the present invention is preferably a latex ink containing an acrylic resin, from the viewpoint of further improving the adhesion between the latex ink-receiving layer (X) and the printed area. The content of the resin in the latex ink is preferably 1% by mass to 20% by mass, and more preferably 2% by mass to 10% by mass, based on the total amount of the latex ink.

[0088] (dispersion medium) Latex ink contains water as a dispersion medium. The content of the dispersion medium (water) in the latex ink is preferably 50% to 98% by mass, more preferably 60% to 97% by mass, and even more preferably 70% to 96% by mass, based on the total amount of the latex ink.

[0089] (coloring agent) Latex inks typically contain a colorant. As the colorant, various dyes, various pigments, etc. can be used. The content of the colorant in the latex ink is preferably 0.1% by mass to 20% by mass, and more preferably 0.2% by mass to 10% by mass, based on the total amount of the latex ink.

[0090] (Other ingredients) The latex ink may contain components other than those already described (other components). Examples of such components include dispersants, antifungals, anticorrosives, pH adjusters, surfactants, plasticizers, ultraviolet absorbers, and light stabilizers.

[0091] <Formation of the printing part> The printed portion using latex ink is formed by applying latex ink onto the latex ink-receiving layer (X) of the film for latex ink. From the viewpoint of further improving the adhesion between the latex ink-receiving layer (X) and the printed portion, the latex ink is preferably a latex ink containing an acrylic resin. The method for applying the latex ink is not particularly limited, and various printing methods can be used, but inkjet methods are preferred. Examples of inkjet methods include piezo methods and thermal jet methods. When applying the latex ink, the film for latex ink may be heated. The heating temperature is not particularly limited, but is preferably 40°C to 90°C. By the above method, a printed matter having a printed portion printed with latex ink on the latex ink-receiving layer (X) of the film for latex ink can be obtained. The latex ink is preferably a latex ink containing an acrylic resin, from the viewpoint of further improving adhesion between the latex ink-receiving layer (X) and the printed portion. [Example]

[0092] The present invention will be specifically described with reference to the following examples, but the present invention is not limited to these examples.

[0093] [Methods for measuring various physical properties] The methods for measuring various physical properties in the examples are as follows. (1) Hydroxyl value The hydroxyl value of the acrylic resin (A) having a crosslinkable functional group was measured in accordance with JIS K0070:1992. (2) Acid value The acid value of the acrylic resin (A) having a crosslinkable functional group was measured in accordance with JIS K0070:1992. (3) Glass transition temperature (Tg) The glass transition temperature (Tg) of the acrylic resin (A) having a crosslinkable functional group was measured in accordance with JIS K 7121:1987 using a differential scanning calorimeter (manufactured by TA Instruments Japan, product name "DSC Q2000") at a heating rate of 20°C / min. (4) Thickness of each layer The thickness of each layer was measured using a constant pressure thickness measuring instrument manufactured by Teclock Corporation (model number: "PG-02J", standard specifications: compliant with JIS K6783:1994, JIS Z1702:1994, and JIS Z1709:1995).

[0094] [Examples 1 to 4, Comparative Example 1] The films for latex ink of Examples 1 to 4 and Comparative Example 1 were prepared by the following procedure.

[0095] <Preparation of Resin Composition> The resin compositions were prepared using the following resins and crosslinking agents.

[0096] (resin) -Acrylic resin (A) having crosslinkable functional groups- An acrylic resin having a crosslinkable functional group, a hydroxyl value of 11.0 mgKOH / g, an acid value of 3.9 mgKOH / g, and a glass transition temperature (Tg) of 90°C was used.

[0097] (Crosslinking agent) -Crosslinking agent (B)- Aromatic polyisocyanate (B1): Trimethylolpropane adduct tolylene diisocyanate "Isocyanate compound (B2)": A partially modified product of an isocyanurate compound (corresponding to a crosslinking agent containing an isocyanurate compound (B2-1) and a modified isocyanurate compound (B2-2)). -Crosslinking agent (B')- An isocyanurate compound (unmodified, corresponding to the isocyanurate compound (B2-1)) was used.

[0098] (Other additives) Tin-based catalysts

[0099] Each resin composition was prepared according to the formulation shown in Table 1 (amount of active ingredient converted into active ingredient) (active ingredient concentration: 10% by mass, dilution solvent: ethyl acetate), and applied to one side of a polyethylene terephthalate (PET) substrate (thickness: 50 μm) using a Mayer bar so that the film thickness after drying would be 1 μm.

[0100] Next, the solvent contained in the resin composition applied to the substrate was removed by heating at 90°C for 1 minute using a hot air dryer, and then the substrate was left to stand for 7 days in an environment of 23°C and 50% relative humidity to allow crosslinking. This resulted in a 1 μm-thick latex ink-receiving layer (X), and a film for latex ink. However, the test sample for evaluating sticking resistance was prepared without the 7-day standing step after solvent removal, and was subjected to the sticking resistance evaluation test immediately after solvent removal.

[0101] <Rating 1> (1) Evaluation of ink adhesion For each of the latex ink films of Examples 1 to 4 and Comparative Example 1, a predetermined test pattern was printed on the surface of the latex ink receiving layer (X) using latex ink (HP882, manufactured by Hewlett-Packard) by the inkjet method with an inkjet printer (HP Latex R2000, manufactured by Hewlett-Packard) to form a printed portion (printed layer). Then, the latex ink films of Examples 1 to 4 and Comparative Example 1, on which a printed portion of a predetermined test pattern was formed, were left to stand for one day in an environment of 23°C and a relative humidity of 50%, to prepare test samples. Then, a 100mm x 24mm piece of Nichiban Cellotape (registered trademark) was applied to the side of the test sample on which the printed area was formed, and the remaining rate of the printed area (remaining area / total area) after the tape was removed was determined and evaluated according to the following criteria. 1: Less than 20% remaining 2: Residual rate 20% to less than 40% 3: Residual rate 40% or more but less than 60% 4: Residual rate 60% to less than 90% 5: Survival rate 90% or more The higher the remaining rate, the better the ink adhesion of the latex ink-receiving layer.

[0102] (2) Evaluation of sticking resistance The latex ink films of Examples 1 to 4 and Comparative Example 1 (the latex ink films immediately after solvent removal, which are the test samples for evaluating the above-mentioned sticking resistance) were each cut into 5 cm x 10 cm pieces and 10 sheets were stacked to produce a laminate. The laminate was sandwiched between 3 mm thick glass plates, and with a 2 kg weight placed on the glass plates, it was left to stand for 7 days in an environment of 40°C and 80% relative humidity. The laminate was then removed from between the glass plates and left to stand for 24 hours in an environment of 23°C and 50% relative humidity, after which the latex ink films were peeled off one by one, and the peeling noise and sticking were evaluated. The peeling noise was rated on a 5-point scale of 1, 2, 3, 4, and 5, in descending order of loudness. If no peeling noise was heard, the rating was 5. The quieter the peeling noise (the higher the rating), the better the sticking resistance.

[0103] The results of Evaluation 1 are shown in Table 1. The content ratio [(B1) / (B2)] of the aromatic polyisocyanate (B1) to the isocyanurate compound (B2) in Example 3 was 1.13 by mass, and the content ratio [(B1) / (B2)] in Example 4 was 1.41 by mass.

[0104] [Table 1]

[0105] From Table 1, we can see the following: It can be seen that the films for latex ink of Examples 1 to 4 have excellent ink adhesion and excellent sticking resistance. On the other hand, when only the unmodified isocyanate compound (B2-1) was used as the crosslinking agent as in Comparative Example 1, it was found that the ink adhesion was poor and the sticking resistance was also poor.

[0106] <Rating 2> (1) Evaluation of water abrasion resistance For each of the films for latex ink of Examples 1 to 4 and Comparative Example 1, a predetermined test pattern was printed in the same manner as in Ink Adhesion Evaluation 1 to form a printed portion (printed layer). Then, the latex ink films of Examples 1 to 4 and Comparative Example 1, on which a printed portion of a predetermined test pattern was formed, were left to stand for one day in an environment of 23°C and a relative humidity of 50%, to prepare test samples. Then, a 3% by mass aqueous solution of an anionic surfactant (sodium laureth sulfate) was sprayed onto the entire surface of the test sample on which the printed area was formed, and the sample was left to stand for 10 minutes.The entire surface on which the printed area was formed was then rubbed vigorously with a rubber squeegee to determine the remaining rate of the printed area (remaining area / total area), and evaluated according to the following criteria. 1: Less than 20% remaining 2: Residual rate 20% to less than 40% 3: Residual rate 40% or more but less than 60% 4: Residual rate 60% to less than 90% 5: Survival rate 90% or more The higher the remaining rate of the printed portion, the more excellent the water abrasion resistance of the latex ink-receiving layer. (2) Evaluation of bending resistance The latex ink films (before printing) of Examples 1 to 4 and Comparative Example 1 were used as samples and tested using a cylindrical mandrel bending tester with a mandrel diameter of 5 mm in accordance with JIS K 5600-5-1:1999, and the degree of whitening of the samples after the test was evaluated visually. The degree of whitening was evaluated on a 5-point scale of 1, 2, 3, 4, and 5. If no whitening was observed, the evaluation value was 5. The weaker the whitening (the higher the evaluation value), the better the bending resistance.

[0107] The results of Evaluation 2 are shown in Table 2.

[0108] [Table 2]

[0109] From Table 2, we can see the following: It is clear that the films for latex ink of Examples 1 to 4 are excellent in water abrasion resistance and bending resistance. Among these, the films for latex inks of Examples 3 and 4 are found to have extremely excellent water abrasion resistance, and the films for latex inks of Examples 1 and 3 are found to have extremely excellent bending resistance. [Explanation of symbols]

[0110] 1 Latex ink film X Latex ink receiving layer Y base material Ya One side of the substrate The other side of the Yb substrate Z adhesive layer

Claims

1. A film for latex inks, comprising a laminated structure in which a latex ink-receiving layer (X) and a substrate (Y) are laminated together, the latex ink-receiving layer (X) being formed from a resin composition (x1) containing an acrylic resin (A) having a crosslinkable functional group and a crosslinking agent (B), and the crosslinking agent (B) containing an aromatic polyisocyanate (B1), the crosslinking agent (B) further contains an isocyanurate compound (B2), the isocyanurate compound (B2) contains an isocyanurate compound (B2-1) and a modified isocyanurate compound (B2-2), the isocyanurate compound (B2-1) is a trimer of 1,6-hexamethylene diisocyanate, and the modified isocyanurate compound (B2-2) is a trimer of 1,6-hexamethylene diisocyanate and has one or more tertiary amino groups.

2. The film for latex ink according to claim 1 , wherein the substrate (Y) comprises a polyester-based resin.

3. 3. The film for latex ink according to claim 1, wherein the latex ink receiving layer (X) is laminated on one surface of the substrate (Y), and a pressure-sensitive adhesive layer (Z) is provided on the other surface of the substrate (Y).

4. 4. The film for latex ink according to claim 3, wherein the adhesive surface of the adhesive layer (Z) is covered with a release liner.

5. 5. The film for latex ink according to claim 1, wherein a content of the aromatic polyisocyanate (B1) relative to 100 parts by mass of the acrylic resin (A) having a crosslinkable functional group is 7.0 parts by mass or more.

6. 6. The film for latex ink according to claim 1, wherein a content of the aromatic polyisocyanate (B1) relative to 100 parts by mass of the acrylic resin (A) having a crosslinkable functional group is less than 24.2 parts by mass.

7. The film for latex ink according to any one of claims 1 to 6, which is used for printing using latex ink containing an acrylic resin.

8. A method for using the film for latex ink according to any one of claims 1 to 6 to form a printed portion on the latex ink-receiving layer of the film for latex ink using latex ink.

9. A method for producing a printed matter, comprising the step of forming a printed portion on the latex ink-receiving layer of the film for latex ink according to any one of claims 1 to 6 using latex ink.

10. A printed matter having a printed area printed with latex ink on the latex ink-receiving layer of the film for latex ink according to any one of claims 1 to 6.

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