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US 2011/0003123 A1Published application
Sensitizer/initiator combination for negative-working thermal-sensitive compositions usable for lithographic plates
OwnerChristopher D. Simpson, Harald Baumann +1inventors
InventorsChristopher D. Simpson, Harald Baumann, Bernd Strehmel
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Abstract
The radiation-sensitive composition and the negative working imageable element include a cationic IR absorber with tetraarylborate counteranion and an onium initiator with tetraarylborate counteranion. The use of these components provides high imaging sensitivity, good shelflife and high print run length.
Claims12
A radiation-sensitive composition comprising:
- (a) a sensitizer dye capable of absorbing radiation of the range of 700 to 1200 nm
- (b) an initiator generating radicals in interacting with the exposed sensitizer
- (c) a free radical polymerizable component, and
- (d) optionally a polymeric binder,
- wherein the sensitizer dye is a cationic dye having a tetraarylborate anion and the initiator is an onium compound selected from diaryliodonium tetraarylborates, triarylsulfonium tetraarylborates, diazonium tetraarylborates, phosphonium tetraarylborates, and N-heterocyclic onium tetraarylborates, wherein N is substituted with —OR wherein R is an optionally substituted hydrocarbyl group.
2 more elements
(canceled)
Dependencies are inferred from the claim text.