Ink composition, inkjet recording method, process for producing lithographic printing plate, and lithographic printing plate

Abstract

An ink composition is provided that includes (A) one type of compound (monomer (A)) selected from the group consisting of a difunctional (meth)acrylic acid ester or amide having an alkylene group of 6 to 12 carbons, and a difunctional vinyl ether having an alkylene group of 6 to 12 carbons, (B) a polymerization initiator, and (C) a colorant. There is also provided an inkjet recording method that includes a step (a) of discharging the ink composition onto a recording medium and a step (b) of irradiating the discharged ink composition with actinic radiation so as to cure the ink composition. Furthermore, a process for producing a lithographic printing plate is provided that includes a step (a′) of discharging the ink composition onto a hydrophilic support and a step (b′) of irradiating the discharged ink composition with actinic radiation so as to cure the ink composition, thus forming a hydrophobic image on the hydrophilic support by curing the ink composition. A lithographic printing plate produced by the process for producing a lithographic printing plate is also provided.

Description

Claims

1. An ink composition comprising: (A) one type of compound (monomer (A)) selected from the group consisting of a difunctional (meth)acrylic acid ester or amide having an alkylene group of 6 to 12 carbons, and a difunctional vinyl ether having an alkylene group of 6 to 12 carbons;(B) a polymerization initiator; and(C) a colorant.

2. The ink composition according to claim 1, wherein the monomer (A) is one type of compound selected from the group consisting of an ester of (meth)acrylic acid and a diol having an alkylene group of 6 to 12 carbons, an amide of (meth)acrylic acid and a diamine having an alkylene group of 6 to 12 carbons, and a vinyl ether of a diol having an alkylene group of 6 to 12 carbons,.

3. The ink composition according to claim 1, wherein the monomer (A) is one type of compound selected from the group consisting of 1,6-hexane diacrylate, 1,7-heptane diacrylate, 1,8-octane diacrylate, 1,9-nonane diacrylate, 1,10-decane diacrylate, 1,11-undecane diacrylate, 1,12-dodecane diacrylate, 1,6-hexane dimethacrylate, 1,7-heptane dimethacrylate, 1,8-octane dimethacrylate, 1,9-nonane dimethacrylate, 1,10-decane dimethacrylate, 1,11-undecane dimethacrylate, 1,12-dodecane dimethacrylate, 1,6-hexane diacrylamide, 1,7-heptane diacrylamide, 1,8-octane diacrylamide, 1,9-nonane diacrylamide, 1,10-decane diacrylamide, 1,11-undecane diacrylamide, 1,12-dodecane diacrylamide, 1,6-hexane divinyl ether, 1,7-heptane divinyl ether, 1,8-octane divinyl ether, 1,9-nonane divinyl ether, 1,10-decane divinyl ether, 1,11-undecane divinyl ether, 1,12-dodecane divinyl ether, 1,6-(2-ethylhexane)diacrylate, 1,6-(2-ethylhexane)dimethacrylate, 1,6-(2-ethylhexane)diacrylamide, and 1,6-(2-ethylhexane)divinyl ether.

4. The ink composition according to claim 1, wherein it comprises two or three types of monomers (A).

5. The ink composition according to claim 1, wherein it comprises two or three types of difunctional (meth)acrylic acid ester having an alkyl group of 8 to 10 carbons as the monomer (A).

6. The ink composition according to claim 1, wherein the alkylene group is directly bonded to two (meth)acrylic acid esters or amides, or to two vinyl ethers.

7. The ink composition according to claim 1, wherein the alkylene group is a straight chain alkylene group.

8. The ink composition according to claim 1, wherein the alkylene group is an alkylene group of 8 to 12 carbons.

9. The ink composition according to claim 1, wherein the monomer (A) is contained at 10 wt % or greater relative to the total content of polymerizable compound in the ink composition.

10. The ink composition according to claim 1, wherein it is for inkjet recording.

11. An inkjet recording method comprising: a step (a) of discharging the ink composition according to claim 1 onto a recording medium; anda step (b) of irradiating the discharged ink composition with actinic radiation so as to cure the ink composition.

12. A process for producing a lithographic printing plate, the process comprising: a step (a′) of discharging the ink composition according to claim 1 onto a hydrophilic support; anda step (b′) of irradiating the discharged ink composition with actinic radiation so as to cure the ink composition, thus forming a hydrophobic image on the hydrophilic support by curing the ink composition.

13. A lithographic printing plate produced by the process for producing a lithographic printing plate according to claim 12.