On-press developable IR sensitive printing plates

Details On-press developable IR sensitive printing plates On-press developable IR sensitive printing plates

2005-01-25

2005-01-25

Gilliam, Barbara L. (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

C430S282100, C430S286100, C430S287100, C430S288100, C430S302000, C430S309000, C430S434000, C430S494000, C430S944000, C430S945000, C430S964000

Reexamination Certificate

active

06846614

ABSTRACT:
The present invention relates to IR-sensitive compositions suitable for the manufacture of printing plates developable on-press. The IR-sensitive compositions comprise a first polymeric binder which does not comprise acidic groups having a pKa value≦8; a second polymeric binder comprising polyether groups; an initiator system; and a free radical polymerizable system comprising at least one member selected from unsaturated free radical polymerizable monomers, free radical polymerizable oligomers and polymers containing C═C bonds in the back bone and/or in the side chain groups. The initiator system includes (i) at least one compound capable of absorbing IR radiation; (ii) at least one compound capable of producing radicals selected from polyhaloalkyl-substituted compounds; and (iii) at least one polycarboxylic acid of formula R4—(CR5R6)r—Y—CH2COOH, wherein oxi<redii+1.6 eV, where oxi=oxidation potential of component (i) in eV, and redii=reduction potential of component (ii) in eV.

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