Lithographic printing plate precursor

Patent metadata

Field	Value
Publication number	US-9568822-B2
Application number	US-201414889885-A
Country	US
Kind code	B2
Filing date	Jun 12, 2014
Priority date	Jun 14, 2013
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

A negative-working lithographic printing plate precursor includes a support and a coating containing a photopolymerizable layer including a polymerizable compound including:
a free radical polymerizable group, and at least one moiety having a structure according to Formula (I):

wherein
n represents an integer equal to 0 or 1;
L 1 represents a divalent linking group; and
* denotes the linking positions to the rest of the structure, with the proviso that the carbonyl groups in Formula (I) are bonded to a carbon atom.

First claim

The invention claimed is:

1. A lithographic printing plate precursor comprising:
a support including a hydrophilic surface or a hydrophilic layer; and
a coating including a photopolymerizable layer; wherein
the photopolymerizable layer includes a polymerizable compound including:
an ethylenically unsaturated group; and
at least one moiety having a structure according to Formula (I):

wherein
n represents an integer equal to 0 or 1;
L 1 represents a divalent linking group;
* denotes linking positions to remaining portions of the structure of the at least one moiety;
the carbonyl groups in Formula (I) are bonded to a carbon atom;
the polymerizable compound is represented by Formula (III):

R 1 and R 2 independently represent a group including an ethylenically unsaturated group; and
L 2 and L 3 independently represent a divalent linking group.

2. The precursor according to claim 1 , wherein the polymerizable compound is represented by Formula (IV):

wherein
R 3 and R 4 independently represent a terminal group; and
L 4 and L 5 independently represent a divalent linking group.

3. The precursor according to claim 2 , wherein R 3 and R 4 independently represent hydrogen, an optionally substituted alkyl or cycloalkyl group, an optionally substituted aryl group, an optionally substituted aralkyl group, or an optionally substituted heteroaryl group.

4. The precursor according to claim 2 , wherein L 4 and L 5 represent an optionally substituted alkylene, cycloalkylene, arylene, or heteroarylene, —O—, —CO—, —CO—O—, —O—CO—, —CO—NH—, —NH—CO—, —NH—CO—O—, —O—CO—NH—, —NH—CO—NH—, —NH—CS—NH—, —CO—NR′—, —NR″—CO—, —NH—CS—NH—, —SO—, —SO 2 —, —SO 2 —NH—, —NH—SO 2 —, —CH═N—, —NH—NH—, —N + (CH 3 ) 2 —, —S—, —S—S—, and/or combinations thereof, wherein R′ and R″ each independently represent an optionally substituted alkyl, aryl, or heteroaryl.

5. The precursor according to claim 1 , wherein the precursor does not include a protective overcoat layer.

6. A method of making a lithographic printing plate comprising the steps of:
providing a lithographic printing plate precursor according to claim 1 ;
image-wise exposing the precursor with a laser emitting IR-light or violet light; developing the precursor off-press by treating the precursor with a gum solution to remove non-exposed areas of the coating from the support and to develop and gum the precursor in one single step.

Assignees

• Agfa Graphics Nv

Inventors

• Steenackers Marin
• Loccufier Johan
• Verbrugghe Sam
• Heylen Kristof

Classifications

• B41C1/1008

  by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials · CPC title

• G03F7/20

  Exposure; Apparatus therefor (photographic printing apparatus for making copies G03B27/00) · CPC title

• B41C2210/04

  Negative working, i.e. the non-exposed (non-imaged) areas are removed · CPC title

• B41C2210/08

  Developable by water or the fountain solution · CPC title

• B41C2210/22

  characterised by organic non-macromolecular additives, e.g. dyes, UV-absorbers, plasticisers · CPC title