Lithographic printing plate precursor requiring no fountain solution

• US 5,871,883 A
• Filed: 11/27/1996
• Issued: 02/16/1999
• Est. Priority Date: 11/27/1995
• Status: Expired due to Fees

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Hirano, Tsumoru, Inno, Toshifumi
• Primary Examiner(s): Hamilton, Cynthia
• Application Number:
  US08/757,814
• Time in Patent Office: 811 Days
• Field of Search: 430/272.1, 430/303
• US Class Current: 430/272.1
• CPC Class Codes: B41C 1/1033 by laser or spark ablation
• CPC Class Codes: B41C 2210/16 Waterless working, i.e. ink repelling exposed (imaged) or non-exposed (non-imaged) areas, not requiring fountain solution or water, e.g. dry lithography or driography
• CPC Class Codes: B41N 1/003 with ink abhesive means or abhesive forming means, such as abhesive siloxane or fluoro compounds, e.g. for dry lithographic printing
• CPC Class Codes: G03F 7/0752 in non photosensitive layers or as additives, e.g. for dry lithography

Abstract

A lithographic printing plate precursor requiring no fountain solution possible to conduct heat mode recording by a laser beam and excellent in image reproducibility and scratch resistance, which comprises a support having provided thereon a light-heat conversion layer containing a compound converting a laser beam to heat and a silicone rubber layer in this order, wherein the light-heat conversion layer contains an addition polymer having a group capable of reacting with a silicone crosslinking agent at a side chain thereof, and the addition polymer reacts with a silicone crosslinking agent contained in the silicone rubber layer when the silicone rubber layer is formed by coating and drying.

Claims

1. A lithographic printing plate precursor requiring no fountain solution comprising a support having provided thereon a light-heat conversion layer containing a compound capable of converting a laser beam to heat energy and a silicone rubber layer in this order, wherein the light-heat conversion layer contains a reaction product of an addition polymer having a group capable of reacting with a silicone crosslinking agent at a side chain of said addition polymer, said reaction product being formed by a reaction of the addition polymer with said silicone crosslinking agent, said crosslinking agent having been contained in the silicone rubber layer and said reaction product being formed when the silicone rubber layer is dried.

2. The lithographic printing plate precursor requiring no fountain solution of claim 1, wherein the addition polymer comprises a repeating unit represented by formula (1):

##STR19## wherein R represents a hydrogen atom or a methyl group;

X represents --COO--, --CONH-- or a phenylene group;

Y represents --COO--, --OCO--, --CONH--, --NHCO--, --NHCOO--, --OCONH--, --O--, --S--, --NH-- or a phenylene group;

L₁ and L₂ each represents an unsubstituted or substituted alkylene group having 1 to 20 carbon atoms;

Z represents a hydroxyl group, --CH═

CH₂ or --C(CH₃)═

CH₂ ;

p, q and r each represents 0 or 1; and

n represents an integer of 0 to 3.

3. The lithographic printing plate precursor requiring no fountain solution of claim 1, wherein the silicone rubber layer is formed from a composition comprising (a) 100 parts by weight of diorganopolysiloxane having a number average molecular weight of 3,000 to 40,000, (b) 3 to 70 parts by weight of a crosslinking agent that crosslinks by a condensation reaction, and (c) 0.01 to 40 parts by weight of a catalyst.

4. The lithographic printing plate precursor requiring no fountain solution of claim 1, wherein the silicone rubber layer is formed from a composition comprising (d) 100 parts by weight of diorganopolysiloxane having addition reactive functional groups and having a number average molecular weight of 3,000 to 40,000, (e) 0.1 to 10 parts by weight of organohydrogenpolysiloxane, and (f) 0.00001 to 1 parts by weight of an addition catalyst.