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 I, a polymerizable compound, and a polymerization initiator on a support, wherein the polymerizable compound is a urethane (meth)acrylate compound: ##STR00019## in Formula I, 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, a naphthalene ring, 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.5 and R.sup.6 independently represents a hydrocarbon group, R.sup.5 and R.sup.6 are optionally linked to form a 5-membered ring or a 6-membered ring, 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 the infrared absorber represented by Formula I is an infrared absorber represented by Formula II: ##STR00020## in Formula II, 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, a naphthalene ring, 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.

3. The lithographic printing plate precursor according to claim 2, 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.

4. The lithographic printing plate precursor according to claim 1, wherein the polymerizable compound further contains an unsaturated ester of alcohol, and the unsaturated ester of alcohol is a tri- or higher polyfunctional ethylenically unsaturated compound.

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

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

7. 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.

8. 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.

9. A lithographic printing plate precursor comprising an image recording layer containing an infrared absorber represented by Formula I, a polymerizable compound, and a polymerization initiator on a support, wherein the polymerizable compound is a deca- or higher polyfunctional ethylenically unsaturated compound: ##STR00021## in Formula I, 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, a naphthalene ring, 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.5 and R.sup.6 independently represents a hydrocarbon group, R.sup.5 and R.sup.6 are optionally linked to form a 5-membered ring or a 6-membered ring, 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.

10. The lithographic printing plate precursor according to claim 9, wherein the infrared absorber represented by Formula I is an infrared absorber represented by Formula II: ##STR00022## in Formula II, 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, a naphthalene ring, 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.

11. The lithographic printing plate precursor according to claim 10, 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.

12. The lithographic printing plate precursor according to claim 9, wherein the polymerizable compound further contains an unsaturated ester of alcohol, and the unsaturated ester of alcohol is a tri- or higher polyfunctional ethylenically unsaturated compound.

13. The lithographic printing plate precursor according to claim 9, wherein the polymerization initiator is a diphenyliodonium salt substituted with an alkyl group.

14. The lithographic printing plate precursor according to claim 9, wherein the image recording layer further contains a leuco compound.

15. The lithographic printing plate precursor according to claim 9, wherein the image recording layer is removable by one or both of dampening water and a printing ink.

16. A method of producing a lithographic printing plate, comprising: an exposure step of image-wise exposing the lithographic printing plate precursor according to claim 9, 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.

17. A lithographic printing plate precursor comprising an image recording layer containing an infrared absorber represented by Formula I, a polymerization initiator, and a thermoplastic polymer particle on a support, wherein a polymer contained in the thermoplastic polymer particle contains a monomer unit derived from styrene and a monomer unit derived from an acrylic compound: ##STR00023## in Formula I, 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, a naphthalene ring, 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.5 and R.sup.6 independently represents a hydrocarbon group, R.sup.5 and R.sup.6 are optionally linked to form a 5-membered ring or a 6-membered ring, 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.

18. The lithographic printing plate precursor according to claim 17, wherein the infrared absorber represented by Formula I is an infrared absorber represented by Formula II: ##STR00024## in Formula II, 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, a naphthalene ring, 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.

19. The lithographic printing plate precursor according to claim 18, 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

[0261] FIG. 1 is a schematic view illustrating one structure example of a development treatment apparatus used in the invention.

REFERENCE SINGS LIST

[0262] 11: rolling brush roll

[0263] 12: backing roll

[0264] 13: conveyance roll

[0265] 14: conveyance guide plate

[0266] 15: spray pipe

[0267] 16: pipe line

[0268] 17: filter

[0269] 18: plate charge stand

[0270] 19: plate discharge stand

[0271] 20: treatment liquid tank

[0272] 21: circulation pump

[0273] 22: drier

[0274] 30: lithographic printing plate precursor