Composition for lithographic printing plate and lithographic printing plate precursor
The present invention has an objective of providing a composition for a lithographic printing plate, which provides an image-forming layer exhibiting superior ink receptivity and uniformity, and in which a coating solution containing the composition possesses a good defoaming property and can effectively form an image-forming layer at high speed. In addition, the present invention has another objective of providing a lithographic printing plate precursor or a dummy plate which can be produced at high speed with superior production efficacy. The present invention provides a composition for a lithographic printing plate containing a fluoroaliphatic group-containing copolymer having a specific chemical structure, the lithographic printing plate precursor or a dummy plate containing a layer having the aforementioned composition.
1. A composition for a lithographic printing plate, comprising:
a fluoroaliphatic group-containing copolymer having at least a unit represented by the following general formula:
wherein
R denotes a hydrogen atom or a methyl group;
n denotes an integer from 1 to 6;
a denotes an integer from 1 to 4;
b denotes an integer from 1 to 3; and
c denotes an integer from 1 to 3.
2. The composition for a lithographic printing plate according to claim 1 , wherein the fluoroaliphatic group-containing copolymer further has a unit corresponding to poly(oxyalkylene) acrylate and/or poly(oxyalkylene) methacrylate.
3. The composition for a lithographic printing plate according to claim 1 , wherein the fluoroaliphatic group-containing copolymer further has a unit having an acidic hydrogen atom.
4. The composition for a lithographic printing plate according to claim 1 , wherein the fluoroaliphatic group-containing copolymer further has a unit having an ethylenically unsaturated group in a side chain.
5. The composition for a lithographic printing plate according to claim 1 , wherein the composition is photosensitive.
6. A lithographic printing plate precursor, comprising:
a substrate; and
an image-forming layer comprising the composition for a lithographic printing plate according to claim 1 , on the substrate.
7. The lithographic printing plate precursor according to claim 6 , wherein the image-forming layer comprises a photo-thermal convertor.
8. The lithographic printing plate precursor according to claim 7 , wherein the image-forming layer further comprises a water-insoluble and alkaline aqueous solution-soluble or alkaline aqueous solution-dispersible resin.
9. The lithographic printing plate precursor according to claim 8 , wherein the image-forming layer further comprises an acid generator.
10. The lithographic printing plate precursor according to claim 7 , wherein the image-forming layer further comprises a polymerization initiator and a radical-polymerizable compound.
11. The lithographic printing plate precursor according to claim 6 , wherein the image-forming layer further comprises a photo-polymerization initiator and an ethylenically unsaturated bond-containing compound.
12. The lithographic printing plate precursor according to claim 6 , wherein the image-forming layer comprises a plurality of layers; and
one or more of the layers comprise a photo-thermal convertor.
13. The composition for a lithographic printing plate according to claim 1 , wherein the composition is not photosensitive.
14. A dummy lithographic printing plate, comprising:
a substrate; and
a protecting layer comprising the composition for a lithographic printing plate according to claim 13 , on the substrate.