Photosensitive resin composition for lithographic printing plate and lithographic printing original plate

• US 20040175652A1
• Filed: 03/24/2004
• Published: 09/09/2004
• Est. Priority Date: 10/16/2002
• Status: Abandoned Application

• Current Assignee: Mitsui Chemicals Incorporated (Mitsui Chemicals)
• Original Assignee: Mitsui Chemicals Incorporated (Mitsui Chemicals)
• Inventors: Suzuki, Yuko, Naito, Shinya, Takano, Kouji, Sanada, Takayuki, Koide, Akihiro
• Application Number:
  US10/807,452
• Publication Number:
  US 20040175652A1
• Time in Patent Office: Days
• US Class Current: 430/270.1
• CPC Class Codes: B41C 1/1008 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 Class Codes: B41C 1/1041 by modification of the lithographic properties without removal or addition of material, e.g. by the mere generation of a lithographic pattern
• CPC Class Codes: B41C 2210/04 Negative working, i.e. the non-exposed (non-imaged) areas are removed
• CPC Class Codes: B41C 2210/08 Developable by water or the fountain solution
• CPC Class Codes: B41C 2210/24 characterised by a macromolecular compound or binder obtained by reactions involving carbon-to-carbon unsaturated bonds, e.g. acrylics, vinyl polymers
• CPC Class Codes: B41M 5/368 involving the creation of a soluble/insoluble or hydrophilic/hydrophobic permeability pattern; Peel development B41M5/366 takes precedence
• CPC Class Codes: G03F 7/033 the binders being polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
• CPC Class Codes: G03F 7/038 Macromolecular compounds which are rendered insoluble or differentially wettable G03F7/075 takes precedence; macromolecular azides G03F7/012; macromolecular diazonium compounds G03F7/021

Abstract

It relates to a photosensitive resin composition for lithographic printing plate characterized by the fact that the photosensitive resin composition for lithographic printing plate comprises not less than 10% by weight and not more than 90% by weight of a hydrophilic polymer having at least a hydrophilic group and not less than 0.5% by weight and not more than 20% by weight, based on the amount of the hydrophilic polymer, of a compound that inhibits hydrogen bond within the molecule and/or between the molecules of the hydrophilic polymer. The lithographic printing original plate preferable has a hydrophilic resin photosensitive layer obtained by crosslinking a photosensitive resin composition that comprises not less than 10% by weight and not more than 90% by weight of a hydrophilic polymer having at least a hydrophilic group and not less than 0.5% by weight and not more than 20% by weight, based on the amount of the hydrophilic polymer, of a compound that inhibits hydrogen bond within the molecule and/or between the molecules of the hydrophilic polymer.

An original plate for CTP, which can be handled even in a bright room, is excellent in hydrophilicity, does not require operations of development and wiping-off and hardly brings about scumming even when the amount of the fountain solution is reduced, is provided.

Claims

1. A photosensitive resin composition for a lithographic printing plate comprising not less than 10% by weight and not more than 90% by weight of a hydrophilic polymer having at least a hydrophilic group, based on the amount of the photosensitive resin composition, and not less than 0.5% by weight and not more than 20% by weight, based on the amount of the hydrophilic polymer, of a compound that inhibits hydrogen bonding within the molecule and/or between the molecules of the hydrophilic polymer.

2. A photosensitive resin composition for a lithographic printing plate comprising not less than 10% by weight and not more than 90% by weight of a hydrophilic polymer having at least a hydrophilic group, based on the amount of the photosensitive resin composition, and not less than 0.5% by weight and not more than 20% by weight, based on the amount of the hydrophilic polymer, of a compound represented by formula (1):

3. The photosensitive resin composition for lithographic printing plate described in claim 2, wherein at least a part of the compound represented by formula (1) is an N,N-disubstituted (meth)acrylamide compound.

4. The photosensitive resin composition for lithographic printing plate described in claim 2, wherein at least a part of the compound represented by formula (1) is urea.

5. The photosensitive resin composition for lithographic printing plate described in claim 3, wherein the N,N-disubstituted (meth)acrylamide compound has been copolymerized with the hydrophilic polymer.

6. A lithographic printing original plate comprising a hydrophilic photosensitive layer obtained from a photosensitive resin composition comprising not less than 10% by weight and not more than 90% by weight of a hydrophilic polymer having at least a hydrophilic group, based on the amount of the photosensitive resin composition, and not less than 0.5% by weight and not more than 20% by weight, based on the amount of the hydrophilic polymer, of a compound represented by formula (1):

7. The lithographic printing original plate described in claim 6, wherein the said hydrophilic photosensitive layer has been crosslinked.

8. The lithographic printing original plate described in claim 6, wherein at least a part of the compound represented by formula (1) is an N,N-disubstituted (meth)acrylamide compound.

9. The lithographic printing original plate described in claim 6, wherein at least a part of the compound represented by formula (1) is urea.

10. The lithographic printing original plate described in claim 8, wherein the said N,N-disubstituted (meth)acrylamide compound has been copolymerized with the said hydrophilic polymer.

11. The lithographic printing original plate described in claim 6, wherein a surface of said hydrophilic photosensitive layer can be converted from hydrophilic to ink-receptive by irradiation with light.

12. A lithographic printing plate obtained by irradiating a light on a surface of the lithographic printing original plate described in claim 6 thereby converting the surface of the irradiated area to ink-receptive.

13. A lithographic printing original plate comprising a hydrophilic resin photosensitive layer comprising a photosensitive resin composition comprising not less than 10% by weight and not more than 90% by weight of a hydrophilic polymer having at least a hydrophilic group, based on the amount of the photosensitive resin composition, and not less than 0.5% by weight and not more than 20% by weight, based on the amount of the hydrophilic polymer, of a compound that inhibits hydrogen bonding within the molecule and/or between the molecules of the hydrophilic polymer.