Process for making lithographic printing plate

Patent metadata

Field	Value
Publication number	US-9114602-B2
Application number	US-201314039857-A
Country	US
Kind code	B2
Filing date	Sep 27, 2013
Priority date	Mar 28, 2011
Publication date	Aug 25, 2015
Grant date	Aug 25, 2015

Abstract

A process for making a lithographic printing plate is provided that includes a step of producing a negative-working lithographic printing plate precursor comprising, above a support, a photopolymerizable photosensitive layer comprising a vinylcarbazole compound-derived monomer unit-containing acrylic polymer and/or a urethane-acrylic hybrid polymer, a step of imagewise exposing the negative-working lithographic printing plate precursor, and a step of developing the exposed negative-working lithographic printing plate precursor using a developer comprising (Component A) an organic solvent having a solubility in water at 20° C. of 1.5 to 7.0 g/100 mL, (Component B) an amphoteric surfactant represented by Formula (I) below and/or Formula (II) below, and (Component C) water.

First claim

What is claimed is:

1. A process for making a lithographic printing plate comprising
a step of preparing a negative-working lithographic printing plate precursor comprising, above a support, a photopolymerizable photosensitive layer comprising a vinylcarbazole compound-derived monomer unit-containing acrylic polymer and/or a urethane-acrylic hybrid polymer,
a step of imagewise exposing the negative-working lithographic printing plate precursor, and
a step of developing the exposed negative-working lithographic printing plate precursor using a developer comprising (Component A) an organic solvent having a solubility in water at 20° C. of 1.5 to 7.0 g/100 mL, (Component B) an amphoteric surfactant represented by Formula (I) below and/or Formula (II) below, and (Component C) water

wherein in Formula (I) R 1 to R 3 independently denote an alkyl group, in Formula (II) R 4 to R 6 independently denote an alkyl group, L denotes an alkylene group, and A denotes a carboxylate ion or a sulfonate ion.

2. The process for making a lithographic printing plate according to claim 1 , wherein Component B is an amphoteric surfactant represented by Formula (I).

3. The process for making a lithographic printing plate according to claim 2 , wherein at least one selected from the group consisting of R 1 , R 2 , and R 3 comprises in its chain a linking group selected from the group consisting of an ester bond, an amide bond, and an ether bond.

4. The process for making a lithographic printing plate according to claim 2 , wherein R 1 , R 2 , and R 3 have a sum total of 8 to 22 carbons.

5. The process for making a lithographic printing plate according to claim 1 , wherein Component A is an organic solvent selected from the group consisting of benzyl alcohol, ethylene glycol monophenyl ether, and propylene glycol monobutyl ether.

6. The process for making a lithographic printing plate according to claim 1 , wherein Component A is benzyl alcohol.

7. The process for making a lithographic printing plate according to claim 1 , wherein Component A has a content in the developer of 2 to 40 wt %.

8. The process for making a lithographic printing plate according to claim 1 , wherein Component A has a content in the developer of 5 to 20 wt %.

9. The process for making a lithographic printing plate according to claim 1 , wherein Component B has a content in the developer of 1 to 15 wt %.

10. The process for making a lithographic printing plate according to claim 1 , wherein Component B has a content in the developer of 4 to 10 wt %.

11. The process for making a lithographic printing plate according to claim 1 , wherein Component C has a content in the developer of at least 50 wt %.

12. The process for making a lithographic printing plate according to claim 1 , wherein the developer further comprises an anionic surfactant and/or a nonionic surfactant.

13. The process for making a lithographic printing plate according to claim 1 , wherein the developer has a pH of 6 to 8.

14. The process for making a lithographic printing plate according to claim 1 , wherein the acrylic polymer further comprises an acrylonitrile-derived monomer unit.

15. The process for making a lithographic printing plate according to claim 1 , wherein the urethane-acrylic hybrid polymer comprises a monomer unit derived from a compound selected from the group consisting of diphenylmethane diisocyanate, m-tolylene diisocyanate, isophorone diisocyanate, and dicyclohexylmethane diisocyanate.

16. The process for making a lithographic printing plate according to claim 1 , wherein the photopolymerizable photosensitive layer is sensitive to infrared light and comprises a triphenylalkyl borate salt and/or a tetraphenyl borate salt.

17. The process for making a lithographic printing plate according to claim 16 , wherein the photopolymerizable photosensitive layer further comprises a copper phthalocyanine pigment.

18. The process for making a lithographic printing plate according to claim 1 , wherein the photopolymerizable photosensitive layer is sensitive to infrared light, does not comprise a borate salt, but comprises a dye.

19. The process for making a lithographic printing plate according to claim 1 , wherein the photopolymerizable photosensitive layer comprises a cyanine dye and an iodonium salt.

Assignees

• Fujifilm Corp

Inventors

• Sonokawa Koji

Classifications

• G03F7/322

  Aqueous alkaline compositions · CPC title

• G03F7/32

  Liquid compositions therefor, e.g. developers · CPC title

• G03F7/038 Primary

  Macromolecular compounds which are rendered insoluble or differentially wettable (G03F7/075 takes precedence; macromolecular azides G03F7/012; macromolecular diazonium compounds G03F7/021) · CPC title

• G03F7/032

  with binders · CPC title

• G03F7/033

  the binders being polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers · CPC title