Positive-working lithographic printing plate precursors

Details Positive-working lithographic printing plate precursors Positive-working lithographic printing plate precursors

2005-01-25

2005-01-25

Hamilton, Cynthia (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

C430S155000, C430S160000, C430S273100, C430S271100, C430S302000, C430S944000, C101S451000

Reexamination Certificate

active

06846613

ABSTRACT:
A positive-working printing plate precursor for wet lithographic printing is disclosed which comprises a support having a hydrophilic surface and a coating comprising a first layer closest to the support, said first layer containing an oleophilic phenolic resin soluble in an aqueous alkaline developer, and a second layer containing an amphyphilic polymer, wherein(a) the second layer is capable of preventing the aqueous alkaline developer from penetrating into the first layer to an extent that substantially no dissolution of unexposed coating occurs upon immersion in the aqueous alkaline developer during a time period t2;(b) and wherein said capability of the second layer of preventing the aqueous alkaline developer from penetrating into the first layer is reduced upon exposure to heat or light to an extent that substantially complete dissolution of exposed coating occurs upon immersion in the aqueous alkaline developer during a time period t1;wherein t2>t1and t2−t1is at least 10 seconds; and wherein the amphyphilic polymer is a block- or graft-copolymer comprising (i) a poly(alkylene oxide) block and (ii) a block comprising siloxane and/or perfluorohydrocarbon units.

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Product Data Sheet Tego Glide 410; Slip and flow additive, one page, Issue date of Mar. 1999 from Tego Chemie Service GmbH, obtained from www.alpchemicals.com.tr/pdf/Glide%20410_e.pdf.*
Search Report for EP 01 00 0109 dated Sep. 6, 2001.

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