Photosensitive material and method of producing offset printing

Details Photosensitive material and method of producing offset printing Photosensitive material and method of producing offset printing

1996-10-18

1998-03-10

Hamilton, Cynthia

Radiation imagery chemistry: process, composition, or product th

Stripping process or element

Forming nonplanar image

4302781, 430260, 430261, G03F 7032, G03F 734

Patent

active

057259917

ABSTRACT:
A photosensitive material for the production of offset printing plates which contains a) a coating base which is composed of aluminum or an aluminum alloy and is suitable for offset printing, b) a hydrophilic coating containing an organic polymer and a free-radical-polymerizable compound and having a coating weight in the range from 0.001 to 1 g/m.sup.2, c) a photopolymerizable coating containing (1) a polymeric binder, (2) a free-radical-polymerizable compound and (3) a compound or a combination of compounds which is capable of initiating the polymerization of the compound (2) on exposure to actinic radiation, and d) a transparent covering sheet, the adhesion of the photopolymerizable coating (c) to the hydrophilic coating (b) and/or the covering sheet (d) being altered by exposure. The material is processed to form the printing plate by imagewise exposure and peeling the covering sheet (d) together with the unexposed areas of the coating (c) off the coating base (a) ("peel apart"). Printing plates having good resolution and high run performance are obtained.

REFERENCES:
patent: 4175964 (1979-11-01), Uchida et al.
patent: 4349620 (1982-09-01), Cyr et al.
patent: 4895787 (1990-01-01), Platzer

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