PS plate for making lithographic printing plate requiring no dam

Details PS plate for making lithographic printing plate requiring no dam PS plate for making lithographic printing plate requiring no dam

1990-10-26

1991-12-03

Brammer, Jack

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

430271, 430273, 430281, 430283, 430284, 430306, 430950, G03C 176

Patent

active

050699997

ABSTRACT:
A presensitized plate for use in making a lithographic printing plate requiring no dampening water comprises a substrate provided thereon with in order: (1) a photopolymerizable light-sensitive layer which comprises a monomer or an oligomer having at least one photopolymerizable olefinically unsaturated double bond, an organic solvent-soluble polyurethane resin or polyamide resin which is solid at room temperature and has film-forming ability and a photopolymerization initiator; (2) a crosslinked silicone rubber layer; and (3) a transparent cover coat layer, wherein the photopolymerization initiator comprises dialkylaminoarylcarbonyl compounds and at least one member selected from the group consisting of xanthones, thioxanthones, acrydones, benzophenones which do not carry a dialkylamino group, benzanthrones and anthraquinones and the transparent cover coat layer is formed from a biaxially oriented polypropylene film having a thickness ranging from 6 to 22 .mu.m and an oxygen permeability ranging from 900 to 10,000 cc/m.sup.2 /24 hr./at. at 20.degree. C. The presensitized plate does not cause so-called "fogging" even when it is kept to stand under irradiation with white light rays and whose sensitivity is not adversely affected by the degree of vacuum when the plate is exposed to light with a vacuum contact printer.

REFERENCES:
patent: 4006447 (1991-04-01), Umetha et al.
patent: 4323637 (1987-04-01), Chen et al.
patent: 4427759 (1984-01-01), Gruetzmacher et al.
patent: 4576897 (1986-03-01), Fujikawa et al.
patent: 4587199 (1986-05-01), Bennett
patent: 4743527 (1988-05-01), Nosheda et al.
patent: 4863831 (1989-09-01), Kirumae et al.
patent: 4957850 (1990-09-01), Kusuta et al.

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