Active energy ray curable overprint varnish composition, method for producing printed matter using same, and method for suppressing odor and migration of printed matter

Abstract

To provide an active energy ray-curable overprint varnish composition capable of reducing odor and migration from a formed varnish film while maintaining the performance as a varnish composition. [Solution] A varnish composition is used which comprises a monomer, which is a compound having two or more ethylenically unsaturated bonds, and a photopolymerization initiator, the monomers including monomer A having four or more ethylenically unsaturated bonds and monomer B having an alkylene oxide-modified bisphenol A skeleton or the like and having two ethylenically unsaturated bonds, the photopolymerization initiator being selected from (A) a compound having a diphenylmethane skeleton, (B) a compound having a morpholine skeleton and a fluorene skeleton, and (C) a compound having a diphenyl ether skeleton, and the proportion of monomer A among the above monomers is 10 to 55 mass%, and the proportion of monomer B is 10 to 46 mass%.

Description

[Technical field]

[0001] The present invention relates to an active energy ray-curable overprint varnish composition, a method for producing a printed item using the same, and a method for suppressing odor and migration of a printed item. [Background technology]

[0002] After printing on the surface of various substrates such as film, sheet, and plate, overprint varnish (OP varnish) is widely used to protect the substrate itself and the printed surface and to impart gloss. When an active energy ray curable varnish composition is used as the OP varnish for such surface processing, the varnish composition is applied to the substrate surface and then irradiated with active energy rays such as ultraviolet rays or electron beams, whereby the varnish composition instantly cures to form a glossy cured film, and thus higher productivity can be obtained compared to conventional vinyl cladding processing. Furthermore, active energy ray curable varnish compositions are also preferable from the viewpoint of environmental protection, since they do not emit VOCs (volatile organic compounds) into the atmosphere, unlike solvent-based coating agents. Due to these advantages, coating processing using conventional vinyl cladding processing and solvent-based coating is rapidly being replaced by coating processing using active energy ray curable varnish compositions. Such surface varnish processing is widely applied to ordinary printed matter such as magazine covers, posters, calendars, etc., as well as to packaging fields such as carton printed matter, and has become familiar in our lives.

[0003] It is known that such active energy ray-curable varnish compositions can be imparted with various functions, such as adhesion to substrates, high gloss, and blocking resistance, by using compounds necessary for curing, such as monomers and oligomers having ethylenically unsaturated bonds, in combination with various other components as necessary (see, for example, Patent Documents 1 to 3, etc.). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-167088 A [Patent Document 2] Japanese Patent Application Publication No. 10-17787 [Patent Document 3] JP 2004-315546 A Summary of the Invention [Problem to be solved by the invention]

[0005] Thus, the surface treatment of a printed matter using an active energy ray curable overprint varnish composition has a great advantage in that a varnish film with excellent properties can be formed in a short time. However, the surface treatment using an active energy ray curable overprint varnish composition is not without its disadvantages. These are the odor and migration of the formed varnish film. A photopolymerization initiator is added to the active energy ray curable overprint varnish composition in order to cause a polymerization reaction for curing when irradiated with active energy rays. This photopolymerization initiator causes intramolecular cleavage when irradiated with active energy rays, generating lower molecular weight radicals. These radicals then polymerize the monomers and oligomers contained in the varnish composition to cure the varnish composition.

[0006] The generated radicals are incorporated into a polymer formed by polymerization of monomers and oligomers, but low molecular weight compounds generated by intramolecular cleavage of the photopolymerization initiator and low molecular weight compounds generated from some of the radicals remain in the varnish film and are released into the surroundings as volatile organic compounds over time. Examples of these low molecular weight compounds include aldehyde compounds that have a unique odor. Therefore, such odors are often felt from printed matter provided with a varnish film formed from an active energy ray-curable overprint varnish composition. Such odors can sometimes be avoided by consumers.

[0007] In addition, low molecular weight compounds remaining in the varnish film may migrate from the varnish film present on the surface of the printed matter to the inside of the printed matter or to other items that come into contact with the varnish film. This migration of low molecular weight compounds from the varnish film is called migration, and is likely to be a problem along with the odor mentioned above, especially when the printed matter is used in the food packaging field.

[0008] The present invention has been made in consideration of the above circumstances, and aims to provide an active energy ray-curable overprint varnish composition that can reduce the occurrence of odor and migration from the formed varnish film while maintaining the performance of the varnish composition, such as abrasion resistance and scratch resistance. [Means for solving the problem]

[0009] The present inventors have conducted extensive research to solve the above problems, and have found that the above problems can be solved by using a specific photopolymerization initiator and, with respect to monomers that are compounds having two or more ethylenically unsaturated bonds, a monomer having four or more ethylenically unsaturated bonds and a monomer having an alkylene oxide-modified bisphenol A skeleton or an alkylene oxide-modified hydrogenated bisphenol A skeleton and two ethylenically unsaturated bonds in a specific ratio relative to the total monomers. The present invention has been made based on such findings and provides the following.

[0010] (1) The present invention relates to a monomer which is a compound having two or more ethylenically unsaturated bonds. , resin component and a photopolymerization initiator, the monomers being monomer A having four or more ethylenically unsaturated bonds and monomer B having an alkylene oxide-modified bisphenol A skeleton or an alkylene oxide-modified hydrogenated bisphenol A skeleton and two ethylenically unsaturated bonds, the photopolymerization initiator being Compounds represented by the following three chemical formulas and the proportion of the monomer A is 10 to 55 mass % and the proportion of the monomer B is 10 to 46 mass % based on the total amount of the monomers. The resin component is a diallylcycloalkane dicarboxylate resin, and the sp value is 9.0 to 11.0 (cal / cm 3 ) 1 / 2 At least one selected from the group consisting of rosin-modified alkyd resins The active energy ray-curable overprint varnish composition is characterized in that [ka]

[0011] (2) The present invention also relates to the active energy ray-curable overprint varnish composition according to item (1), wherein the number of alkylene oxides added to the monomer B is 3 to 30.

[0012] (3) The present invention also relates to an active energy ray-curable overprint varnish composition according to item (1) or (2), wherein the alkylene oxide in the monomer B is ethylene oxide.

[0013] (4) The present invention also relates to an active energy ray-curable overprint varnish composition according to any one of items (1) to (3), further comprising a diester compound of a dicarboxylic acid as a plasticizer, the compound having a carbon atom content of 20 or more per molecule.

[0014] (5) The present invention also relates to an active energy ray-curable overprint varnish composition according to item (4), wherein the diester compound of the dicarboxylic acid is bis(2-ethylhexyl) sebacate or bis(2-ethylhexyl) adipate.

[0021] ( 6 The present invention relates to a method for producing a coating composition comprising the steps of: (1) applying a coating composition to a surface to be treated, which may or may not be printed with an ink composition; 5 and curing the applied active energy ray-curable overprint varnish composition with active energy rays.

[0022] ( 7The present invention relates to a method for producing a printed matter, comprising the steps of applying an active energy ray-curable overprint varnish composition to a surface to be treated that has been printed or not with an ink composition, and curing the applied active energy ray-curable overprint varnish composition with active energy rays, the active energy ray-curable overprint varnish composition being selected from the group consisting of the above-mentioned items (1) to ( 5 The present invention also relates to a method for suppressing odor and migration originating from a varnish layer formed on the surface of a produced printed matter, the method comprising the step of: Effect of the Invention

[0023] According to the present invention, there is provided an active energy ray-curable overprint varnish composition that can reduce the occurrence of odor and migration from the formed varnish film while maintaining the performance of the varnish composition, such as abrasion resistance and scratch resistance. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment of the active energy ray-curable overprint varnish composition of the present invention (hereinafter also referred to as the "varnish composition of the present invention"), an embodiment of the method for producing a printed matter of the present invention, and an embodiment of the method for suppressing odor and migration originating from a varnish layer of the present invention will be described. Note that the present invention is not limited to the following embodiments and examples, and can be practiced with appropriate modifications within the scope of the present invention.

[0025] <Active energy ray curable overprint varnish composition> The active energy ray curable overprint varnish composition of the present invention has the ability to be cured by irradiation with active energy rays such as ultraviolet rays and electron beams, and is preferably used as an overprint varnish for the surface of a printed material after printing. As described below, the varnish composition of the present invention contains a compound (monomer) having two or more ethylenically unsaturated bonds and a photopolymerization initiator, and the radicals generated when irradiated with active energy rays polymerize the compound having the ethylenically unsaturated bond, thereby curing it to form a coating film. Therefore, when the varnish composition that is sticky on the surface of the printed material immediately after application is irradiated with active energy rays, the varnish composition instantly becomes dry (tack-free).

[0026] The application of the varnish composition of the present invention is not particularly limited, but may include, for example, printed matter obtained by offset printing or the like. A preferred example of such a printed matter is a packaging container. The cured film (i.e., varnish film) obtained by curing the varnish composition of the present invention is robust and has excellent gloss, so that when applied to a packaging container, it protects the packaging container from scratches and provides the packaging container with a high gloss and cosmetic appearance. The term "overprint varnish composition" generally means a varnish composition applied to a printed surface, but in the present invention, the varnish composition applied to the surface of a printed surface and the varnish composition applied to the surface of an unprinted substrate are also called "overprint varnish composition". In addition, in the present invention, a varnish composition applied to the surface of an unprinted substrate with an overprint varnish composition is also treated as a "printed matter".

[0027] Examples of active energy rays used to cure the varnish composition of the present invention include electron beams and ultraviolet rays. Among these, ultraviolet rays are preferred as active energy rays from the viewpoint of the cost and ease of handling of the device. The wavelength of the ultraviolet rays may be appropriately determined according to the absorption wavelength of the photopolymerization initiator used, and may be 400 nm or less. Examples of ultraviolet irradiation devices that generate such ultraviolet rays include metal halide lamps, high-pressure mercury lamps, excimer lamps containing rare gases, ultraviolet light-emitting diodes (LEDs), and the like.

[0028] The varnish composition of the present invention comprises a monomer, which is a compound having two or more ethylenically unsaturated bonds, and a photopolymerization initiator, the monomers being monomer A having four or more ethylenically unsaturated bonds, and monomer B having an alkylene oxide-modified bisphenol A skeleton or an alkylene oxide-modified hydrogenated bisphenol A skeleton and having two ethylenically unsaturated bonds, the photopolymerization initiator being at least one compound selected from the group consisting of (A) a compound having a diphenylmethane skeleton, (B) a compound having a morpholine skeleton and a fluorene skeleton, and (C) a compound having a diphenyl ether skeleton, the proportion of monomer A being 10 to 55 mass% and the proportion of monomer B being 10 to 46 mass% relative to the total of the monomers. Each component will be described below.

[0029] [Photopolymerization initiator] First, the photopolymerization initiator will be described. As already mentioned, the photopolymerization initiator generates radicals by intramolecular cleavage when irradiated with active energy rays. This radical polymerizes a compound having an ethylenically unsaturated bond, which will be described later, to form a cured varnish film. The varnish composition of the present invention contains, as a photopolymerization initiator, at least one selected from the group consisting of (A) a compound having a diphenylmethane skeleton, (B) a compound having a morpholine skeleton and a fluorene skeleton, and (C) a compound having a diphenyl ether skeleton. The present inventors have found through their studies that these photopolymerization initiators can provide a remarkable effect of effectively suppressing odor and migration when applied to a varnish composition. The present invention has been made based on this knowledge, and contains a compound selected from the group consisting of (A) to (C) as a photopolymerization initiator.

[0030] The compound (A) having a diphenylmethane skeleton (hereinafter also referred to as "compound (A)") may be any compound that has a diphenylmethane skeleton in its molecule and undergoes intramolecular cleavage to generate radicals when irradiated with active energy rays. The compound (C) having a diphenyl ether skeleton (hereinafter also referred to as "compound (C)") may be any compound that has a diphenyl ether skeleton in its molecule and undergoes intramolecular cleavage to generate radicals when irradiated with active energy rays.

[0031] More specifically, examples of the compound (A) and the compound (C) include compounds represented by the following general formula (1).

[0032] [ka]

[0033] In the above general formula (1), R 1 and R 2are each independently a hydrocarbon group having 1 to 10 carbon atoms which may have a substituent. Examples of such a hydrocarbon group include an alkyl group having 1 to 10 carbon atoms which may have a branch, a cycloalkyl group having 1 to 10 carbon atoms, and an aryl group having 1 to 10 carbon atoms. Among these, an alkyl group having 1 to 10 carbon atoms which may have a branch is more preferred, and a dimethylmethyl group having a substituent is particularly preferred. Examples of the substituent include a hydroxyl group, an amino group, and a halogen atom, and among these, a hydroxyl group is preferred. In the above general formula (1), X is a methylene group or an oxygen atom. That is, when X is a methylene group, the compound represented by the above general formula (1) is a compound (A), and when X is an oxygen atom, the compound represented by the above general formula (1) is a compound (C).

[0034] The two benzene rings contained in the compound represented by the above general formula (1) are preferably substituted at the para position, and in that case, the compound represented by the above general formula (1) can be represented by the following general formula (1A). 1 , R 2 and X are both the same as those in the above general formula (1).

[0035] [ka]

[0036] More specific examples of the compound (A) and the compound (C) include those represented by the following general formulae (1B-1) and (1B-2). In the following general formulae (1B-1) and (1B-2), R 1 and R 2 are the same as those in the above general formula (1).

[0037] [ka]

[0038] More specific examples of the compound (A) and the compound (C) include those represented by the following general formulae (1C-1) and (1C-2). 1 and L 2 are each independently an optionally branched alkylene group having 1 to 10 carbon atoms. Among such alkylene groups, a dimethylmethylene group is particularly preferred.

[0039] [ka]

[0040] More specifically, the compounds (A) and (C) may be those represented by the following chemical formulas (1D-1) and (1D-2). It goes without saying that the compounds (A) and (C) of the present invention are not limited to these compounds.

[0041] [ka]

[0042] The compound (B) having a morpholine skeleton and a fluorene skeleton (hereinafter also referred to as "compound (B)") may be any compound as long as it has both a morpholine skeleton and a fluorene skeleton in its molecule and undergoes intramolecular cleavage to generate radicals when irradiated with active energy rays.

[0043] More specifically, an example of the compound (B) is a compound represented by the following general formula (2).

[0044] [ka]

[0045] In the above general formula (2), R 3 and R 4are each independently a hydrocarbon group having 1 to 10 carbon atoms which may have a substituent. Preferred examples of such a hydrocarbon group include an alkyl group having 1 to 10 carbon atoms which may have a branch, a cycloalkyl group having 1 to 10 carbon atoms, and an aryl group having 1 to 10 carbon atoms. Of these, an alkyl group having 1 to 5 carbon atoms is preferred. Examples of the substituent include a hydroxyl group, an amino group, and a halogen atom.

[0046] In the above general formula (2), each L is independently a divalent organic group. Examples of such organic groups include divalent hydrocarbon groups having 1 to 10 carbon atoms which may have a substituent. Examples of such hydrocarbon groups include alkylene groups having 1 to 10 carbon atoms which may have a branch, cycloalkylene groups having 1 to 10 carbon atoms, and aryl groups having 1 to 10 carbon atoms. Among these, alkylene groups having 1 to 10 carbon atoms which may have a branch are more preferred, and dimethylmethylene groups are particularly preferred. Examples of the substituents include hydroxyl groups, amino groups, halogen atoms, and the like. In the above general formula (2), n is 0 or 1.

[0047] A specific example of the compound represented by the above general formula (2) is the compound represented by the following general formula (2B). 3 , R 4 and L are each independently a hydrocarbon group having 1 to 10 carbon atoms which may have a substituent, and L is an alkylene group having 1 to 10 carbon atoms which may have a branch. These are the same as those in the above general formula (2).

[0048] [ka]

[0049] More specifically, the compound (B) may be represented by the following chemical formula (2C): It is needless to say that the compound (B) in the present invention is not limited thereto.

[0050] [ka]

[0051] The content of the photopolymerization initiator in the varnish composition of the present invention is preferably 2 to 30 mass % based on the total mass of the varnish composition, more preferably 2 to 15 mass %, and even more preferably 2 to 13 mass %. By having the content of the photopolymerization initiator in the varnish composition within the above range, it is preferable because sufficient curing property of the varnish composition can be achieved at the same time as good internal curing property and cost.

[0052] [monomer] The varnish composition of the present invention contains, as a monomer, a compound having two or more ethylenically unsaturated bonds. The varnish composition of the present invention contains, as the monomers, a monomer A having four or more ethylenically unsaturated bonds and a monomer B having an alkylene oxide-modified bisphenol A skeleton or an alkylene oxide-modified hydrogenated bisphenol A skeleton and having two ethylenically unsaturated bonds, and is characterized in that the proportion of the monomer A is 10 to 55 mass % and the proportion of the monomer B is 10 to 46 mass % with respect to the total monomers contained in the varnish composition. These matters will be explained below.

[0053] The compound having an ethylenically unsaturated bond is a component that polymerizes with radicals generated from a photopolymerization initiator to become a high molecular weight, and various compounds are commercially available, ranging from low molecular weight compounds to those having a relatively high molecular weight called oligomers. In addition, various ethylenically unsaturated bond-containing polymers having a molecular weight even higher than that of oligomers are commercially available. As described above, the varnish composition of the present invention contains a monomer that is a compound having two or more ethylenically unsaturated bonds, but even if the compound has a molecular weight that is generally called an oligomer or polymer, it can be treated as a monomer in the present invention as long as it has two or more ethylenically unsaturated bonds.

[0054] A monomer is a component that has two or more ethylenically unsaturated bonds and polymerizes to a high molecular weight as described above, but before polymerization it is often a liquid component of relatively low molecular weight. In the present invention, such relatively low molecular weight monomers can be used as a solvent when dissolving a resin component to produce a varnish, or for the purpose of adjusting the viscosity of the varnish composition.

[0055] Examples of such monomers include ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, butylene glycol di(meth)acrylate, pentyl glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, (Meth)acrylate, hydroxypivalyl hydroxypivalate di(meth)acrylate, hydroxypivalyl hydroxypivalate dicaprolactonate di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,2-hexanediol di(meth)acrylate, 1,5-hexanediol di(meth)acrylate, 2,5-hexanediol di(meth)acrylate, 1,7-heptanediol di(meth)acrylate, 1,8-octanediol di(meth)acrylate, 1,2-octanediol di(meth)acrylate , 1,9-nonanediol di(meth)acrylate, 1,2-decanediol di(meth)acrylate, 1,10-decanediol di(meth)acrylate, 1,2-decanediol di(meth)acrylate, 1,12-dodecanediol di(meth)acrylate, 1,2-dodecanediol di(meth)acrylate, 1,14-tetradecanediol di(meth)acrylate, 1,2-tetradecanediol di(meth)acrylate, 1,16-hexadecanediol di(meth)acrylate, 1,2-hexadecanediol di(meth)acrylate, 2 -Methyl-2,4-pentanediol di(meth)acrylate, 3-methyl-1,5-pentanediol di(meth)acrylate, 2-methyl-2-propyl-1,3-propanediol di(meth)acrylate, 2,4-dimethyl-2,4-pentanediol di(meth)acrylate, 2,2-diethyl-1,3-propanediol di(meth)acrylate, 2,2,4-trimethyl-1,3-pentanediol di(meth)acrylate, dimethylol octane di(meth)acrylate, 2-ethyl-1,3-hexanediol di(meth)acrylate,2,5-Dimethyl-2,5-hexanediol di(meth)acrylate, 2-Methyl-1,8-octanediol di(meth)acrylate, 2-Butyl-2-Ethyl-1,3-propanediol di(meth)acrylate, 2,4-Diethyl-1,5-pentanediol di(meth)acrylate, 1,2-Hexanediol di(meth)acrylate, 1,5-Hexanediol di(meth)acrylate, 2,5-Hexanediol di(meth)acrylate, 1,7-Heptanediol di(meth)acrylate, 1,8-Octanediol di(meth)acryl acrylate, 1,9-nonanediol di(meth)acrylate, 1,2-decanediol di(meth)acrylate, 1,10-decanediol di(meth)acrylate, 1,2-decanediol di(meth)acrylate, 1,12-dodecanediol di(meth)acrylate, 1,2-dodecanediol di(meth)acrylate, 1,14-tetradecanediol di(meth)acrylate, 1,2-tetradecanediol di(meth)acrylate, 1,16-hexadecanediol di(meth)acrylate, 1,2-hexadecanediol di(meth)acryl acrylate, 2-methyl-2,4-pentanediol di(meth)acrylate, 2-methyl-2-propyl-1,3-propanediol di(meth)acrylate, 2,4-dimethyl-2,4-pentanediol di(meth)acrylate, 2,2-diethyl-1,3-propanediol di(meth)acrylate, 2,2,4-trimethyl-1,3-pentanediol di(meth)acrylate, dimethylol octane di(meth)acrylate, 2-ethyl-1,3-hexanediol di(meth)acrylate, 2,5-dimethyl-2,5-hexanediol di(meth)acrylate Acrylate, 2-butyl-2-ethyl-1,3-propanediol di(meth)acrylate, 2,4-diethyl-1,5-pentanediol di(meth)acrylate, tricyclodecane dimethylol di(meth)acrylate, tricyclodecane dimethylol dicaprolactonate di(meth)acrylate, bisphenol A 1-30 alkylene oxide adduct di(meth)acrylate, bisphenol F 1-30 alkylene oxide adduct di(meth)acrylate, bisphenol S 1-30 alkylene oxide adduct di(meth)acrylate,Bifunctional monomers such as hydrogenated bisphenol A1-30 alkylene oxide adduct di(meth)acrylate, hydrogenated bisphenol F1-30 alkylene oxide adduct di(meth)acrylate, bisphenol A1-30 alkylene oxide adduct dicaprolactonate di(meth)acrylate, bisphenol F1-30 alkylene oxide adduct dicaprolactonate di(meth)acrylate; trifunctional monomers such as glycerin tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, trimethylolpropane tricaprolactonate tri(meth)acrylate, trimethylolethane tri(meth)acrylate, trimethylolhexane tri(meth)acrylate, trimethyloloctane tri(meth)acrylate, pentaerythritol tri(meth)acrylate; trimethylolpropane tetra(meth)acrylate, pentaerythritol tetra(meth)acrylate, Examples of the monomers include tetrafunctional or higher monomers such as pentaerythritol tetracaprolactonate tetra(meth)acrylate, diglycerin tetra(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, ditrimethylolpropane tetracaprolactonate tetra(meth)acrylate, ditrimethylolethane tetra(meth)acrylate, ditrimethylolbutane tetra(meth)acrylate, ditrimethylolhexane tetra(meth)acrylate, ditrimethyloloctane tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, tripentaerythritol hexa(meth)acrylate, tripentaerythritol hepta(meth)acrylate, tripentaerythritol octa(meth)acrylate, and tripentaerythritol polyalkylene oxide hepta(meth)acrylate. Also, as a type of monomer, there is an epoxy (meth)acrylate obtained by (meth)acrylic modification of an epoxy compound. This is a compound obtained by ring-opening addition of (meth)acrylic acid to an epoxy group in an epoxy compound such as an epoxy resin. In this specification, "(meth)acrylate" means "acrylate and / or methacrylate","(Meth)acrylic acid" means "acrylic acid and / or methacrylic acid".

[0056] In the above examples, the term "bisphenol A 1-30 alkylene oxide adduct di(meth)acrylate" means "bisphenol A di(meth)acrylate modified by addition of 1-30 alkylene oxide units." This also applies to each alkylene oxide adduct di(meth)acrylate of bisphenol F, bisphenol S, hydrogenated bisphenol A, hydrogenated bisphenol F, and hydrogenated bisphenol S.

[0057] The oligomer having two or more ethylenically unsaturated bonds that can be used as the monomer of the present invention is a component that polymerizes to a high molecular weight as described above, but since it is originally a relatively high molecular weight component, it is also used for the purpose of imparting appropriate viscosity and elasticity to the varnish composition. Examples of such oligomers include epoxy-modified (meth)acrylates exemplified by esters of hydroxyl groups and (meth)acrylic acid generated after ring-opening the epoxy groups contained in epoxy compounds such as epoxy resins with an acid or base, rosin-modified epoxy acrylates, polyester-modified (meth)acrylates exemplified by esters of terminal hydroxyl groups and (meth)acrylic acid of condensation polymers of dibasic acids and diols, polyether-modified (meth)acrylates exemplified by esters of terminal hydroxyl groups and (meth)acrylic acid of polyether compounds, and urethane-modified (meth)acrylates exemplified by esters of terminal hydroxyl groups and (meth)acrylic acid in condensation polymers of polyisocyanate compounds and polyol compounds. Such oligomers are commercially available and can be obtained under trade names such as the Ebecryl series manufactured by Daicel-Cytec Co., Ltd., the CN and SR series manufactured by Sartomer Corporation, the Aronix M-6000 series, 7000 series, 8000 series, Aronix M-1100, Aronix M-1200, and Aronix M-1600 manufactured by Toa Gosei Co., Ltd., and NK Oligo manufactured by Shin-Nakamura Chemical Co., Ltd.

[0058] A polymer having two or more ethylenically unsaturated bonds that can be used as a monomer of the present invention has a large molecular weight even before being irradiated with active energy rays, and is therefore a component that is useful for improving the viscoelasticity of a varnish composition. Such a polymer is used, for example, in a state dissolved or dispersed in a monomer that is a low-viscosity liquid. Examples of the polymer having an ethylenically unsaturated bond include an acrylic resin having an unreacted unsaturated group, an acrylic-modified phenolic resin, and the like.

[0059] The above monomers may be used alone or in combination of two or more kinds.

[0060] Among these monomers, the varnish composition of the present invention contains monomer A having four or more ethylenically unsaturated bonds, and monomer B having an alkylene oxide-modified bisphenol A skeleton or an alkylene oxide-modified hydrogenated bisphenol A skeleton and two ethylenically unsaturated bonds. By containing monomer A, the varnish composition of the present invention is able to exhibit good curability, and by containing monomer B, the varnish film formed from the varnish composition can have improved abrasion resistance and flexibility.

[0061] Examples of the monomer A include those exemplified as "monomers having four or more functionalities" among the various monomers exemplified above, and among these, ditrimethylol octane tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, etc. are preferred. Any monomer that is not included in the above examples can be used as the monomer A as long as it contains four or more ethylenically unsaturated bonds. The ratio of the monomer A to the total monomers contained in the varnish composition is 10 to 55% by mass. When the ratio of the monomer A to the total monomers contained in the varnish composition is 10% by mass or more, the varnish composition can have good curing properties. When the ratio of the monomer A to the total monomers contained in the varnish composition is 55% by mass or less, the flexibility of the varnish film formed from the varnish composition can be ensured. This ratio is preferably 20 to 55% by mass, more preferably 25 to 55% by mass, and even more preferably 30 to 55% by mass.

[0062] Among the various monomers exemplified above, examples of the monomer B include bisphenol A1-30 alkylene oxide adduct di(meth)acrylate and hydrogenated bisphenol A1-30 alkylene oxide adduct di(meth)acrylate, but any compound may be used as long as it has a bisphenol A skeleton or a hydrogenated bisphenol A skeleton and two ethylenically unsaturated bonds and is modified by the addition of alkylene oxide. Among such compounds, preferred are those having an alkylene oxide addition number of 3 to 30, more preferred are those having an alkylene oxide addition number of 4 to 30, and even more preferred are those having an alkylene oxide addition number of 4 to 20. In addition, preferred examples of the alkylene oxide to be added include ethylene oxide. The ratio of monomer B to the total monomers contained in the varnish composition is 10 to 46% by mass. When the ratio of monomer B to the total monomers contained in the varnish composition is 10% by mass or more, the abrasion resistance of the varnish composition is improved and the flexibility of the varnish film formed from the varnish composition can be ensured. Furthermore, by making the proportion of monomer B to be 46 mass % or less relative to all the monomers contained in the varnish composition, good curability of the varnish composition is ensured.

[0063] The content of the monomer in the varnish composition of the present invention is preferably 10 to 90 mass % based on the total varnish composition, more preferably 20 to 90 mass %, even more preferably 40 to 90 mass %, and particularly preferably 50 to 90 mass %. By having the monomer content within the above range, the varnish composition can have good curing properties and a strong varnish film can be obtained.

[0064] Furthermore, in addition to the above-mentioned monomer, which is a compound having two or more ethylenically unsaturated bonds, a compound having one ethylenically unsaturated bond may be added to the varnish composition of the present invention. Examples of such compounds include alkyl acrylates such as methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, hexyl (meth)acrylate, octyl (meth)acrylate, and dodecyl (meth)acrylate, (meth)acrylic acid, (meth)acrylates of ethylene oxide adducts, (meth)acrylates of propylene 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, and the like. 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, acryloxyethyl phthalate, 2-(meth)acryloyloxyethyl-2-hydroxyethyl phthalate, 2-(meth)acryloyloxypropyl phthalate, β-carboxyethyl (meth)acrylate, (meth)acrylic acid dimer, ω-carboxypolycaprolactone mono(meth)acrylate, dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate, N-vinylpyrrolidone, N-vinylformamide, (meth)acryloylmorpholine, etc. These can be used alone or in combination of two or more.

[0065] [resin] The varnish composition of the present invention preferably further contains a resin component. The resin component contributes to imparting suitable properties such as appropriate coating suitability and viscoelasticity to the varnish composition. Examples of such a resin component include various resins that have been conventionally used in varnish compositions for printing, but it is preferable that the resin component is compatible with the above-mentioned monomers, and examples of such resin components include rosin-modified alkyd resins, diallyl phthalate resins, diallyl cycloalkane dicarboxylate resins, styrene-acrylic resins, acrylic resins, alkyd resins, rosin-modified phenolic resins, rosin-modified maleic acid resins, rosin-modified petroleum resins, rosin ester resins, petroleum resin-modified phenolic resins, vegetable oil-modified alkyd resins, and petroleum resins. Among these resins, diallyl phthalate resins, diallyl cycloalkane dicarboxylate resins, and resins having an sp value of 9.0 to 11.0 (cal / cm 3 ) 1 / 2 The rosin-modified alkyd resin may preferably be at least one selected from the group consisting of:

[0066] The diallyl phthalate resin is a polymer of diallyl phthalate (i.e., polydiallyl phthalate). As the diallyl phthalate resin, a polymer of diallyl phthalate or diallyl isophthalate can be mentioned, and various types are commercially available, so that such commercially available products can be obtained and used.

[0067] The diallylcycloalkane dicarboxylate resin is a type of so-called non-phthalate type allyl resin, and is made of a polymer (i.e., polydiallylcycloalkane dicarboxylate) obtained by a polymerization reaction using hydrogenated diallyl phthalate or hydrogenated diallyl isophthalate as a monomer. As the diallylcycloalkane dicarboxylate resin, polydiallyl-1,2-cyclohexane dicarboxylate, polydiallyl-1,3-cyclohexane dicarboxylate, etc. are commercially available, and such commercially available products can be obtained and used.

[0068] SP value is 9.0 to 11.0 (cal / cm 3 )1 / 2 The rosin-modified alkyd resin is a condensation polymer of an acid component including a resin acid, a fatty acid, and a polybasic acid, and a polyhydric alcohol, and has a solubility parameter sp value of 9.0 (cal / cm) as determined by turbidity point titration. 3 ) 1 / 2 More than 11.0(cal / cm 3 ) 1 / 2 The solubility parameter sp value by turbidity point titration is a value calculated according to the formula of KWSUH and JMCORBETT, and for the calculation of sp value by this method, J. Appl. Polym. Sci. 1968, 12, 2359 can be referred to. The reason why rosin-modified alkyd resins having such a sp value range are preferable is based on the findings of the present inventors that they have good compatibility with the monomers contained in the varnish composition, and a varnish composition having excellent stability over time can be obtained.

[0069] The resin content in the varnish composition of the present invention is preferably from 1 to 20% by mass, and more preferably from 3 to 10% by mass.

[0070] [Plasticizer] The varnish composition of the present invention preferably contains a diester compound of dicarboxylic acid having a carbon content of 20 or more per molecule as a plasticizer. When the varnish composition contains such a plasticizer, the flexibility of the varnish film formed from the varnish composition can be improved. The reason for using a diester compound of dicarboxylic acid having a carbon content of 20 or more per molecule as a plasticizer is based on the findings of the present inventors that, in order to make the flexibility of the varnish film particularly good in a varnish composition containing the above-mentioned monomer A and monomer B, such as the varnish composition of the present invention, it is necessary to use a diester compound of dicarboxylic acid having a carbon content of 20 or more per molecule as a plasticizer.

[0071] Preferred examples of such plasticizers include bis(2-ethylhexyl) sebacate, bis(2-ethylhexyl) adipate, bis(2-ethylhexyl) maleate, etc. The content of the plasticizer in the varnish composition of the present invention is preferably about 0.5 to 3 mass%, more preferably about 1 to 2.5 mass%, and even more preferably about 1.5 to 2 mass%.

[0072] [Other ingredients] In addition to the above-mentioned components, other components may be added to the varnish composition of the present invention as necessary, such as extender pigments, polymerization inhibitors, waxes, etc.

[0073] The extender pigment is a component for imparting properties such as viscoelasticity to the varnish composition, and various types of pigments that are commonly used in the preparation of ink compositions and varnish compositions can be used. Examples of such extender pigments include clay, kaolinite (kaolin), barium sulfate, magnesium sulfate, calcium carbonate, silicon oxide (silica), bentonite, talc, mica, titanium oxide, etc. The amount of such extender pigments to be added is, for example, about 0 to 10% by mass based on the entire varnish composition, but is not particularly limited.

[0074] Preferred examples of the polymerization inhibitor include phenolic compounds such as butylhydroxytoluene, tocopherol acetate, nitrosamines, benzotriazole, and hindered amines, among which butylhydroxytoluene is more preferred. By adding such a polymerization inhibitor to the varnish composition, it is possible to suppress the polymerization reaction from progressing during storage and the thickening of the varnish composition. The content of the polymerization inhibitor in the varnish composition is, for example, about 0.01 to 1 mass%.

[0075] Examples of the wax include paraffin wax, carnauba wax, beeswax, microcrystalline wax, polyolefin wax such as polyethylene wax, Fischer-Tropsch wax, oxidized polyethylene wax, polytetrafluoroethylene wax, amide wax, and fatty acids in the range of about C8 to C18 such as coconut oil fatty acid and soybean oil fatty acid. Examples of the shape of the wax include powder (particle) and oil, and preferred examples of the powder wax include those with an average particle diameter D50 in the range of 1 to 10 μm. The content of the wax in the entire varnish composition can be about 0.1 to 15 mass%, and more preferably about 1 to 5 mass parts.

[0076] <Manufacturing method of printed matter> The present invention also relates to a method for producing a printed matter, which comprises a step of applying the above-mentioned varnish composition of the present invention to a treated surface that is printed or not printed with an ink composition, and curing the applied varnish composition with active energy rays. The term "treated surface that is printed or not printed with an ink composition" refers to a printed surface that is printed with an ink composition, or a surface of a substrate (usually paper) that is not printed with an ink composition, and the printed surface or substrate surface to which the varnish composition is applied is called a treated surface. The "printed surface" here naturally includes not only an image portion to which the ink composition is attached as a result of printing, but also a non-image portion to which the ink composition is not attached. In addition, when applying the varnish composition of the present invention to a printed surface, the printed surface may be dried or cured after printing, and then the varnish composition may be applied, or in-line application may be performed in which the varnish composition is applied wet-on-wet to the printed matter immediately after printing. The treated surface to which the varnish composition has been applied is quickly irradiated with active energy rays, and a varnish film, which is a cured product of the applied varnish composition, is formed. The ink composition used in this case may be an oil-based ink composition or an active energy ray-curable ink composition.

[0077] The means for applying the varnish composition can be any known means without particular limitation, and examples of such means include a coater using a roll coater system or a chamber coater system.

[0078] <Method to suppress odor and migration caused by varnish layer> As already mentioned, the varnish film formed from the varnish composition of the present invention suppresses odor and migration from the varnish film. A method for suppressing odor and migration originating from a varnish layer by utilizing such properties is also one aspect of the present invention.

[0079] The method for suppressing odor and migration originating from a varnish layer of the present invention is characterized in that the varnish composition of the present invention is used as the active energy ray curable overprint varnish composition in the production of a printed matter comprising a step of applying an active energy ray curable overprint varnish composition to a treated surface, which may or may not be printed with an ink composition, and curing the applied active energy ray curable overprint varnish composition with active energy rays. The ink composition used at this time may be an oil-based ink composition or an active energy ray curable ink composition. In addition, "a treated surface, which may or may not be printed with an ink composition" means a printed surface, which is printed with an ink composition, or a surface of a substrate (often paper), which is not printed with an ink composition, and the surface of these printed surfaces or substrates, which are coated with a varnish composition, are called treated surfaces. In addition, the "printed surface" as used herein naturally includes not only the image portion, to which the ink composition is attached as a result of printing, but also the non-image portion, to which the ink composition is not attached. When applying the varnish composition of the present invention to a printed surface, the printed surface may be dried or cured after printing and then the varnish composition may be applied, or in-line application may be performed in which the varnish composition is applied wet-on-wet to the printed material immediately after printing. EXAMPLES

[0080] The present invention will be described in more detail below by way of examples, but the present invention is not limited to the following examples. In the following description, unless otherwise specified, "%" means "% by mass" and "parts" means parts by mass.

[0081] [Preparation of Varnish 1] A mixture of 20 parts by mass of polydiallyl phthalate (manufactured by Osaka Soda Co., Ltd., product name A-DAP), 79 parts by mass of ditrimethylolpropane tetraacrylate (DI-TMPTA), and 1% by mass of methylhydroquinone was heated at 100° C. for 60 minutes to dissolve, thereby preparing varnish 1. The ditrimethylolpropane tetraacrylate used in the preparation of varnish 1 corresponds to monomer A in the present invention.

[0082] [Preparation of varnish 2] A mixture of 20 parts by mass of polydiallyl isophthalate (manufactured by Osaka Soda Co., Ltd., product name ISO-DAP), 79 parts by mass of ditrimethylolpropane tetraacrylate (DI-TMPTA), and 1% by mass of methylhydroquinone was heated at 100° C. for 60 minutes to dissolve, thereby preparing varnish 2. The ditrimethylolpropane tetraacrylate used in the preparation of varnish 2 corresponds to monomer A in the present invention.

[0083] [Preparation of Varnish 3] A mixture of 20 parts by mass of polydiallyl-1,2-cyclohexanedicarboxylate (manufactured by Osaka Soda Co., Ltd., product name RADPAR), 79 parts by mass of ditrimethylolpropane tetraacrylate (DI-TMPTA), and 1% by mass of methylhydroquinone was heated at 100° C. for 60 minutes to dissolve, thereby preparing varnish 3. The ditrimethylolpropane tetraacrylate used in the preparation of varnish 3 corresponds to monomer A in the present invention.

[0084] [Preparation of overprint varnish composition] After mixing the materials in the ratios shown in Tables 1 to 3, the mixture was milled in a triple roll mill to prepare overprint varnish compositions of Examples 1 to 16 and Comparative Examples 1 to 6. In Tables 1 to 3, the contents of each material are shown below, and the amount of each material is in parts by mass. In addition, in each material shown below, "monomer 1" and "monomer 2" correspond to monomer A in the present invention, and "monomer 3" to "monomer 6" correspond to monomer B in the present invention. In Tables 1 to 3, the values ​​shown in the "monomer A" and "monomer B" columns indicate the proportion (% by mass) of monomer A or monomer B relative to the total monomers contained in each varnish composition.

[0085] Extender pigment 1: Calcium carbonate (Shiraishi Kogyo Co., Ltd., product name: Hakuenka T-CC) Extender pigment 2: Barrets Minerals, product name: Talcrone MP12-50 Polymerization inhibitor: DKSH Japan, product name LUNACURE 500 Photopolymerization initiator 1: 2-hydroxy-1-(4-(4-(2-hydroxy-2-methylpropionyl)benzyl)phenyl)-2-methylpropan-1-one (compound represented by the above chemical formula (1D-1)) Photopolymerization initiator 2: 1-(9,9-dibutyl-9H-fluoren-2-yl)-2-methyl-2-morpholin-4-yl-propan-1-one (compound represented by the above chemical formula (2C)) Photopolymerization initiator 3: 2-hydroxy-1-(4-(4-(2-hydroxy-2-methylpropanoyl)phenoxy)phenyl)-2-methylpropan-1-one (compound represented by the above chemical formula (1D-2)) Photopolymerization initiator 4: BASF, product name Irgacure 184 Photopolymerization initiator 5: IGM RESINS, product name Omnirad369 Photopolymerization initiator 6: BASF, product name Irgacure907 Monomer 1: Ditrimethylolpropane tetraacrylate (corresponding to Monomer A in the present invention) Monomer 2: Dipentaerythritol hexaacrylate (corresponding to Monomer A in the present invention) Monomer 3: Ethylene oxide (EO) modified (4 mol) bisphenol A diacrylate (manufactured by MIWON, product name M240; corresponds to monomer B in the present invention) Monomer 4: Ethylene oxide (EO) modified (10 mol) bisphenol A diacrylate (manufactured by Daiichi Kogyo Seiyaku Co., Ltd., product name New Frontier BPE-10; corresponds to Monomer B in the present invention.) Monomer 5: Ethylene oxide (EO) modified (20 mol) bisphenol A diacrylate (manufactured by Daiichi Kogyo Seiyaku Co., Ltd., product name New Frontier BPE-20; corresponds to Monomer B in the present invention.) Monomer 6: Ethylene oxide (EO) modified (4 moles) hydrogenated bisphenol A diacrylate (manufactured by Daiichi Kogyo Seiyaku Co., Ltd., product name New Frontier HBPE-4; corresponds to Monomer B in the present invention.) Monomer 7: Bifunctional bisphenol A epoxy acrylate (MIWON, product name Miramer PE210) Monomer 8: Trimethylolpropane triacrylate Monomer 9: 1,6-Hexanediol diacrylate Plasticizer 1: Bis(2-ethylhexyl) sebacate Plasticizer 2: Bis(2-ethylhexyl) adipate Surface preparation agent: Morimura Chemical Co., Ltd., product name MC-990 Compound Wax: Polyethylene wax (Morimura Chemical Co., Ltd., product name MC-50UV compound)

[0086] Test pieces were prepared for each of the overprint varnish compositions of the Examples and Comparative Examples by the following procedure: First, 0.1 cc of an ink composition (manufactured by Sakata Inx Corporation, product name Diatone Dream Cure BM KT Red) was applied to coated paper (manufactured by Nippon Paper Industries Co., Ltd., product name Aurora Coat) using an RI color spreader (two-split roll, manufactured by Akebono Seisakusho), then 0.15 cc of each overprint varnish composition to be tested was spread and immediately irradiated with ultraviolet light (metal halide lamp, irradiation amount: 36 mJ / cm2). 2) to cure each overprint varnish composition, and this was used as a test specimen.

[0087] [Friction resistance evaluation] The surface of each test piece was rubbed 500 times with a Gakushin-type rub fastness tester (load 500 g, backing paper: high-quality paper). The condition of the printed surface after rubbing was visually observed and evaluated. The evaluation criteria were as follows, and the results are shown in the "Rubbing Resistance" column in Tables 1 to 3. ○: There are no scratches on the printed surface, or only slight scratches are observed that do not cause any practical problems. △: Visible scratches are observed on the printed surface ×: Peeling of the film is observed on the printed surface.

[0088] [Evaluation of scratch resistance] The surface of each test piece was rubbed with the tip of a fingernail, and the state of peeling of the coating was visually observed and evaluated. The evaluation criteria were as follows, and the results are shown in the "Scratch resistance" columns of Tables 1 to 3. ○: No dropouts observed △: Falling off is observed, but the base material is not visible ×: Falling off was observed, and the base material was exposed

[0089] [Gloss rating] The 60° reflected gloss value of each test piece was determined using a Murakami digital gloss meter (manufactured by Murakami Color Research Laboratory Co., Ltd., light source: halogen lamp (12 V, 50 W)). The results are shown in the "Gloss" column of Tables 1 to 3.

[0090] [Migration evaluation] MPPO (modified polyphenylene oxide; 60-80 mesh, product name Tenax) was washed for 6 hours using a Soxhlet extractor with acetone as the solvent, then spread on a petri dish to evaporate the solvent, and further dried in an oven at 160°C for 6 hours. Next, for each of the Examples and Comparative Examples, the mass of the overprint varnish composition after curing was measured to be 1-2 g / m 2After the overprint varnish composition on the paper surface has hardened, 20 or more sheets of paper (0.02 kg / cm2) are applied to the applied surface. 2 ), covered with aluminum foil, and stored at 25°C for 10 days. After that, the surface of the paper was cut into a circle with a diameter of 112 mm (area of ​​1 dm 2 ) was cut out and used as a sample.

[0091] 4 g of MPPO was weighed out and placed in a petri dish, and the above sample was placed on top of the MPPO with the painted surface facing up, and the petri dish was then covered. The petri dish was then inverted and placed in an incubator heated to 60°C together with a blank sample (a petri dish containing only 4 g of MPPO) and left for 10 days. The petri dish was then removed, the lid was removed, and the petri dish was cooled to room temperature.

[0092] The MPPO in the petri dish was transferred to an Erlenmeyer flask, 20 mL of acetone was poured in, and the mixture was shaken for 1 minute, then allowed to stand for 5 minutes, and the acetone was transferred to a 50 mL measuring flask while filtering. This operation was repeated, and finally the 50 mL measuring flask was filled up. The components (migration components) derived from the overprint varnish composition contained in the obtained solution were qualitatively and quantitatively evaluated by GC-MS. The evaluation criteria were as follows, and the results are shown in the "migration" columns of Tables 1 to 3. ○: The amount of migration component is 5 mg / dm 2 is less than △: The amount of migration component is 5mg / dm 2 More than 7mg / dm 2 is less than ×: The amount of migration component is 7 mg / dm 2 That's all.

[0093] [Odor evaluation] The odor of the cured product of each of the overprint varnish compositions in the Examples and Comparative Examples was evaluated according to the following procedure: First, 0.0875 cc of the overprint varnish composition was taken and spread on coated cardboard (manufactured by Oji Materia Co., Ltd., product name UF Coat) using an RI spreader (two-split roll, manufactured by Akebono Seisakusho Co., Ltd.), and immediately irradiated with ultraviolet light (metal halide lamp, irradiation amount: 36 mJ / cm2). 2 ) to harden the spread overprint varnish composition, and prepare an evaluation piece. 0.5 g of this evaluation piece was heated at 120°C for 40 minutes using a headspace sampler, and the vaporized components were analyzed by GC-MS. The odorous components were assumed to be aldehyde substances, and were evaluated by examining the detected peak area. The evaluation criteria were as follows, and the results are shown in the "Odor" columns of Tables 1 to 3. ◎: The peak area of ​​the aldehyde component is less than 500,000 ○: The peak area of ​​the aldehyde component is 500,000 or more and less than 1,000,000 △: The peak area of ​​the aldehyde component is 1 million or more and less than 1.5 million. ×: The peak area of ​​the aldehyde component is 1.5 million or more.

[0094] [Table 1]

[0095] [Table 2]

[0096] [Table 3]

[0097] As shown in Tables 1 to 3, the varnish compositions of Examples 1 to 16, which are varnish compositions of the present invention, had little odor and migration, and also had good results in both abrasion resistance and scratch resistance. On the other hand, the varnish compositions of Comparative Examples 1 to 3 had poor odor and migration, and the varnish compositions of Comparative Examples 4 to 6 had inferior results to the Examples in terms of abrasion resistance and / or scratch resistance.

Claims

1. An active energy ray-curable overprint varnish composition comprising a monomer that is a compound having two or more ethylenically unsaturated bonds, a resin component, and a photopolymerization initiator, The monomers include a monomer A having four or more ethylenically unsaturated bonds, and a monomer B having an alkylene oxide-modified bisphenol A skeleton or an alkylene oxide-modified hydrogenated bisphenol A skeleton and two ethylenically unsaturated bonds, The photopolymerization initiator is at least one compound selected from the group of compounds represented by the following three chemical formulas: The proportion of the monomer A is 10 to 55 mass% and the proportion of the monomer B is 10 to 46 mass% based on the total amount of the monomers; The active energy ray-curable overprint varnish composition, wherein the resin component is at least one selected from the group consisting of diallylcycloalkanedicarboxylate resins and rosin-modified alkyd resins having an sp value of 9.0 to 11.0 (cal / cm 3 ) 1 / 2 . 【Chemistry 1】

2. 2. The active energy ray-curable overprint varnish composition according to claim 1, wherein the number of alkylene oxides added to said monomer B is 3 to 30.

3. 2. The active energy ray-curable overprint varnish composition according to claim 1, wherein the alkylene oxide in the monomer B is ethylene oxide.

4. 2. The active energy ray-curable overprint varnish composition according to claim 1, further comprising a diester compound of a dicarboxylic acid as a plasticizer, the compound having a carbon atom content of 20 or more per molecule.

5. 5. The active energy ray-curable overprint varnish composition according to claim 4, wherein the diester compound of a dicarboxylic acid is bis(2-ethylhexyl) sebacate or bis(2-ethylhexyl) adipate.

6. A method for producing a printed matter, comprising the steps of applying an active energy ray-curable overprint varnish composition according to any one of claims 1 to 5 to a surface to be treated, which surface may or may not be printed with an ink composition, and curing the applied active energy ray-curable overprint varnish composition with active energy rays.

7. A method for suppressing odors and migration originating from a varnish layer formed on the surface of a produced printed matter, comprising the steps of applying an active energy ray-curable overprint varnish composition to a treated surface, which may or may not be printed with an ink composition, and curing the applied active energy ray-curable overprint varnish composition with active energy rays, characterized in that the active energy ray-curable overprint varnish composition described in any one of claims 1 to 5 is used as the active energy ray-curable overprint varnish composition.

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