Photosensitive lithographic printing plate requiring no fountain

Details Photosensitive lithographic printing plate requiring no fountain Photosensitive lithographic printing plate requiring no fountain

1995-12-06

1997-05-13

Hamilton, Cynthia

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

430303, G03F 711

Patent

active

056291361

ABSTRACT:
A presensitized plate for use in making a lithographic printing plate requiring no fountain solution excellent in scratch resistance and press life is disclosed, which comprises support and, formed thereon in order from support, a photosensitive layer and a silicone rubber layer, wherein the silicone rubber layer is a crosslinked and cured product obtained by addition reaction of (a) polysiloxane having alkenyl groups with (b) hydrogen polysiloxane having .tbd.Si--H groups so that the number of .tbd.Si--H groups in (b) is from 11 to 30 based on the number of alkenyl groups in (a), wherein polysiloxane (a) has at least two alkenyl groups directly bonded to silicon atoms per molecule, average repeating number x of --[Si(R.sup.1)(R.sup.2)--O].sub.x -- group of 100 .ltoreq.x.ltoreq.600 (wherein R.sup.1 and R.sup.2 each represents a alkyl group, aryl group, aralkyl group, alkenyl group, polydimethylsiloxane group or halogenated hydrocarbon group, provided that 70% or more of R.sup.1 and R.sup.2 are methyl groups), and alkyl groups or alkenyl groups directly bonded to the terminal silicon atoms, and wherein the hydrogen polysiloxane (b) is formula (I):

REFERENCES:
patent: 5061598 (1991-10-01), Abe et al.
patent: 5069999 (1991-12-01), Higashi et al.
patent: 5266443 (1993-11-01), Higashi et al.

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