Lithographic printing plates utilizing an oleophilic imaging lay

Details Lithographic printing plates utilizing an oleophilic imaging lay Lithographic printing plates utilizing an oleophilic imaging lay

1995-08-14

1997-10-07

Chu, John S.

Radiation imagery chemistry: process, composition, or product th

Stripping process or element

Element

430252, 430253, 430259, 4302731, 430302, 430944, G03F 711

Patent

active

056746580

ABSTRACT:
A lithographic printing plate is comprised of a support having a porous hydrophilic surface, such as grained and anodized aluminum, and an oleophilic imaging layer overlying the porous hydrophilic surface. The imaging layer is comprised of an oleophilic, radiation-absorbing, heat-sensitive, film-forming composition which is readily removable from the porous hydrophilic surface prior to imagewise exposure and which is adapted to form a lithographic printing surface as a result of imagewise exposure to absorbable electromagnetic radiation and subsequent removal of the non-exposed areas to reveal the underlying porous hydrophilic surface. Examples of suitable techniques for removing the non-exposed areas include contact with printing ink on the press, removal by lamination and peel development steps and removal by use of an integral stripping layer.

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