Positive-working lithographic printing plate precursor

Details Positive-working lithographic printing plate precursor Positive-working lithographic printing plate precursor

2007-11-13

2007-11-13

Chu, John S. (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

C430S273100, C430S302000

Reexamination Certificate

active

10243750

ABSTRACT:
A lithographic printing plate precursor is disclosed which comprises (i) a support having a hydrophilic surface or which is provided with a hydrophilic layer and (ii) a coating provided thereon, the coating comprising an oleophilic layer which, upon image-wise exposure to heat or infrared light and subsequent immersion in an aqueous alkaline developer, dissolves in the developer at a higher dissolution rate in exposed areas than in unexposed areas, wherein the oleophilic layer comprises a polymer that is soluble in the developer and an organic dye in a amount sufficient to provide a visible color to the coating, characterized in that said organic dye does not reduce the dissolution rate of the unexposed areas in the developer.By using non-inhibiting dyes, the sensitivity of the precursor upon image-wise exposure is increased.

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