WE CLAIM:
1. Active energy ray-curable ink for offset printing
comprising
a pigment, a polyfunctional (meth)acrylate having a hydroxyl group, and a resin having an ethylenic unsaturated group and a hydrophilic group.
2. The active energy ray-curable ink for offset printing according to claim 1, further comprising a (meth)acrylate having an alicyclic skeleton or an aliphatic skeleton with a carbon number of 6 to 18.
3. The active energy ray-curable ink for offset printing according to claim 2, wherein the (meth)acrylate having an alicyclic skeleton or an aliphatic skeleton with a carbon number of 6 to 18 has at least a tricyclodecane skeleton.
4. The active energy ray-curable ink for offset printing according to claim 2 or 3, wherein the content of the (meth)acrylate having an alicyclic skeleton or an aliphatic skeleton with a carbon number of 6 to 18 in the ink is 5% by mass or more and 50% by mass or less.
5. The active energy ray-curable ink for offset printing according to any one of claims 1 to 4, wherein the hydroxyl value of the polyfunctional (meth)acrylate having the hydroxyl group is 50 mgKOH/g or more and 200 mgKOH/g or less.
6. The active energy ray-curable ink for offset printing according to any one of claims 1 to 5, wherein the hydrophilic
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group of the resin having an ethylenic unsaturated group and a hydrophilic group includes a carboxyl group and a hydroxyl group.
7. The active energy ray-curable ink for offset printing according to any one of claims 1 to 6, wherein an acid value of the resin having an ethylenic unsaturated group and a hydrophilic group is 30 mgKOH/g or more and 250 mgKOH/g or less.
8. The active energy ray-curable ink for offset printing according to any one of claims 1 to 7, wherein an iodine value of the resin having an ethylenic unsaturated group and a hydrophilic group is 0.5 mol/kg or more and 3.0 mol/kg or less.
9. The active energy ray-curable ink for offset printing according to any one of claims 1 to 8, wherein the resin having an ethylenic unsaturated group and a hydrophilic group includes one or more selected from an acrylic resin, a styrene-acrylic resin, and a styrene-maleic acid resin.
10. The active energy ray-curable ink for offset printing according to any one of claims 1 to 9, further comprising a (meth)acrylate having a hydroxyl group and a rosin skeleton.
11. The active energy ray-curable ink for offset printing according to claim 10, wherein the weight average molecular weight of the (meth)acrylate having a hydroxyl group and a rosin skeleton is 400 or more and 3000 or less.
12. The active energy ray-curable ink for offset printing according to claim 10 or 11, wherein the hydroxyl value of the
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(meth)acrylate having a hydroxyl group and a rosin skeleton is 50 mgKOH/g or more and 150 mgKOH/g or less.
13. The active energy ray-curable ink for offset printing
according to any one of claims 10 to 12, wherein the (meth)acrylate
having a hydroxyl group and a rosin skeleton has two or more
(meth)acrylate-derived structures.
14. The active energy ray-curable ink for offset printing according to any one of claims 10 to 13, wherein the content of the (meth)acrylate having a hydroxyl group and a rosin skeleton in the ink is 5% by weight or more and 50% by weight or less.
15. The active energy ray-curable ink for offset printing according to any one of claims 1 to 14, further comprising an acylphosphine oxide compound.
16. The active energy ray-curable ink for offset printing according to any one of claims 1 to 15, further comprising a hydroxy compound having a molecular weight of 200 or less and containing no (meth)acrylate group, and the content of the hydroxy compound having a molecular weight of 200 or less and containing no (meth)acrylate group in the ink is 0.15% by mass or more and 1.0% by mass or less.
17. The active energy ray-curable ink for offset printing according to claim 16, further comprising an acid catalyst.
18. The active energy ray-curable ink for offset printing according to claim 17, wherein the acid catalyst is a quaternary ammonium cation.
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19. The active energy ray-curable ink for offset printing according to any one of claims 1 to 18, further comprising a surfactant having an HLB value of 8 or more and 18 or less.
20. The active energy ray-curable ink for offset printing according to any one of claims 1 to 19, wherein the pigment is one or more selected from the group consisting of titanium dioxide, zinc oxide, and alumina white.
21. The active energy ray-curable ink for offset printing according to any one of claims 1 to 20, wherein the viscosity (A) at a rotation speed of 0.5 rpm measured at 25°C with a cone plate rotational viscometer is 5 Pa•s or more and 100 Pa•s or less, and the viscosity (B) at a rotation speed of 50 rpm is 10 Pa•s or more and 40 Pa•s or less, and the viscosity ratio (B)/(A) is 0.25 or more and 0.4 or less.
22. A method for producing a printed matter, comprising applying the active energy ray-curable ink for offset printing according to any one of claims 1 to 21 to a substrate, followed by irradiation with an active energy ray.
23. The method for producing a printed matter according to claim 22, wherein the substrate is a plastic film having a thickness of 5 μm or more and 50 μm or less.
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