Photopolymerization initiator system comprising a spectral sensi

Details Photopolymerization initiator system comprising a spectral sensi Photopolymerization initiator system comprising a spectral sensi

1995-02-28

1997-05-13

Lesmes, George F.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Compositions to be polymerized by wave energy wherein said...

522 26, 522 27, 522 28, 522 29, 522 30, 522173, 522180, 522182, 522183, 4302701, 4302811, C08F 250

Patent

active

056293542

ABSTRACT:
Improved photopolymerization initiator systems are comprised of a spectral sensitizer that sensitizes in the ultraviolet or visible regions of the spectrum and an N-aryl, O-aryl or S-aryl polycarboxylic acid co-initiator. The improved initiator systems are incorporated in photo-polymerizable compositions containing one or more addition-polymerizable ethylenically-unsaturated compounds to form compositions suitable for the preparation of radiation-sensitive layers in lithographic printing plates adapted to be imagewise-exposed with ultraviolet- or visible-light-emitting lasers such as argon-ion lasers and frequency doubled Nd:YAG lasers. Such plates are able to effectively meet the dual requirements of very high photospeed and very good shelf-life required in computer-to-plate systems.

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Yamaoka et al, Journal of Applied Polymer Science, vol. 38, 1271-1285 (1989).

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