Photopolymerizable composition with oxalic acid photoinitiator

Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making

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20415923, 430286, 430906, 430909, 430911, 430913, 430923, 430927, 430306, G03C 168

Patent

active

042218594

ABSTRACT:
The subject invention relates to photopolymerizable compositions useful for making plastic printing elements for use in photolithography and other photomechanical processes. The photopolymerizable compositions comprise an aqueous mixture of a water-insoluble resin, a water-soluble binder, a crosslinking agent, and a photopolymerization initiator having an alpha-keto ester linkage. In particular, photopolymerization initiators include oxalic acid, sodium oxalate, potassium oxalate, lithium oxalate and urea oxalate. The printing plates prepared from the compositions herein disclosed have improved ink receptivity, good retention of such ink, receptivity even after long continued use, greater durability and excellent binding qualities.

REFERENCES:
patent: 3388995 (1965-06-01), Schwerin et al.
patent: 3418118 (1968-12-01), Thommes et al.
patent: 3718973 (1973-02-01), Geruay et al.
patent: 3740224 (1973-06-01), Barzynski et al.
patent: 3879204 (1975-04-01), Geruay

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