Lithographic printing plate precursor, method of producing lithographic printing plate, and lithographic printing method

Abstract

A lithographic printing plate precursor including an image recording layer containing an infrared absorber represented by Formula I, on a support, and a method of producing a lithographic printing plate and a lithographic printing method using the lithographic printing plate precursor. ##STR00001##

Claims

1. A lithographic printing plate precursor comprising an image recording layer containing an infrared absorber represented by Formula II, a polymerizable compound, and a polymerization initiator on a support, wherein the polymerizable compound contains a deca- or higher polyfunctional ethylenically unsaturated compound and further contains an unsaturated ester of alcohol, wherein the unsaturated ester of alcohol is a tri- or higher polyfunctional ethylenically unsaturated compound: ##STR00019## in Formula Il, each of X.sup.1 and X.sup.2 independently represents a sulfur atom, an oxygen atom, or a dialkylmethylene group having 12 or less carbon atoms, each of Y.sup.1 and Y.sup.2 independently represents a monovalent organic group or a hydrogen atom, each of Z.sup.1 and Z.sup.2 independently represents a benzene ring unsubstituted or substituted with an electron-donating group or an aryl group having from 6 to 20 carbon atoms, a naphthalene ring unsubstituted or substituted with an electron-donating group or an aryl group having from 6 to 20 carbon atoms, or a 6- to 20-membered heteroaromatic ring unsubstituted or substituted with an electron-donating group or an aryl group having from 6 to 20 carbon atoms, each of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 independently represents a hydrogen atom or a hydrocarbon group having 12 or less carbon atoms, each of R.sup.7, R.sup.8, R.sup.9, and R.sup.10 independently represents a hydrogen atom or a monovalent organic group, and A represents a counter ion present in a case in which charge neutralization is needed.

2. The lithographic printing plate precursor according to claim 1, wherein in Formula II, each of X.sup.1 and X.sup.2 independently represents a dialkylmethylene group having 12 or less carbon atoms, each of Y.sup.1 and Y.sup.2 independently represents an alkyl group having from 1 to 10 carbon atoms, each of Z.sup.1 and Z.sup.2 independently represents an unsubstituted benzene ring, each of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 independently represents a hydrogen atom, and each of R.sup.7, R.sup.8, R.sup.9, and R.sup.10 independently represents a hydrogen atom.

3. The lithographic printing plate precursor according to claim 1, wherein the polymerization initiator is a diphenyliodonium salt substituted with an alkyl group.

4. The lithographic printing plate precursor according to claim 1, wherein the image recording layer further contains a leuco compound.

5. The lithographic printing plate precursor according to claim 1, wherein the image recording layer is removable by one or both of dampening water and a printing ink.

6. A method of producing a lithographic printing plate, comprising: an exposure step of image-wise exposing the lithographic printing plate precursor according to claim 1, to form an exposed area and an unexposed area; and an on-press development step of feeding at least one of a printing ink or dampening water to remove the unexposed area.

7. The lithographic printing plate precursor according to claim 1, wherein the image recording layer further contains a thermoplastic polymer particle, and a polymer contained in the thermoplastic polymer particle contains a monomer unit derived from styrene and a monomer unit derived from an acrylic compound.

8. The lithographic printing plate precursor according to claim 7, wherein in Formula II, each of X.sup.1 and X.sup.2 independently represents a dialkylmethylene group having 12 or less carbon atoms, each of Y.sup.1 and Y.sup.2 independently represents an alkyl group having from 1 to 10 carbon atoms, each of Z.sup.1 and Z.sup.2 independently represents an unsubstituted benzene ring, each of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 independently represents a hydrogen atom, and each of R.sup.7, R.sup.8, R.sup.9, and R.sup.10 independently represents a hydrogen atom.

Description

BRIEF DESCRIPTION OF DRAWING

(1) FIG. 1 is a schematic view illustrating one structure example of a development treatment apparatus used in the invention.

REFERENCE SINGS LIST

(2) 11: rolling brush roll

(3) 12: backing roll

(4) 13: conveyance roll

(5) 14: conveyance guide plate

(6) 15: spray pipe

(7) 16: pipe line

(8) 17: filter

(9) 18: plate charge stand

(10) 19: plate discharge stand

(11) 20: treatment liquid tank

(12) 21: circulation pump

(13) 22: drier

(14) 30: lithographic printing plate precursor