Lithographic printing plate precursors with oligomeric or...

Radiation imagery chemistry: process – composition – or product th – Imaged product – Including resin or synthetic polymer

Reexamination Certificate

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C430S278100, C430S302000, C430S286100, C430S281100, C430S926000, C430S920000, C430S915000, C430S922000, C430S916000, C522S904000, C522S913000, C522S009000, C522S016000, C522S026000, C522S023000, C522S018000, C101S456000, C101S463100

Reexamination Certificate

active

07615323

ABSTRACT:
Lithographic printing plate precursor comprising (a) a lithographic substrate with a hydrophilic surface and (b) a radiation-sensitive coating on the hydrophilic surface comprising (i) one or more types of monomers and/or oligomers and/or polymers, each comprising at least one ethylenically unsaturated group accessible to a free radical polymerization, (ii) at least one sensitizer, and at least one coinitiator capable of forming free radicals together with the sensitizer (ii); characterized in that the at least one sensitizer is an oligomeric or polymeric compound comprising the following structural unit (Formula (I)), wherein π1is an aromatic or heteroaromatic unit or a combination of the two so that a conjugated n-system is present between the two groups Z in structure (I), each Z independently represents a heteroatom, each R1and R2is independently selected from a halogen atom, an alkyl, aryl, alkylaryl or aralkyl group, a group —NR3R4and a group —OR5, each R3, R4and R5is independently selected from an alkyl, aryl, alkylaryl and aralkyl group, a and b independently represent 0 or an integer from 1 to 4, n has a value of >1 and AS is an aliphatic spacer.

REFERENCES:
patent: 1 349 006 (2003-10-01), None
Grant et al (eds), Grant' & Hackh's Chemical Dictionary, fifth ed, “aliphatic”, McGraw-Hill Book Company, New York, N.Y., 1987, p. 22.
Z. Yang et al. “A soluble blue-light-emitting polymer”, Macromolecules, vol. 26, 1993, pp. 1188-1190.
A.M. Sarker et al. “Synthesis, characterization, and optical properties of copolymer containing fluorine-substituted distyrylbenzene and non-conjugated spacers” Macromolecules, vol. 32, 1999, pp. 7409-7413.
M. Zheng et al, “Oxadiazole containing conjugated-nonconjugated blue and blue-green light emitting copolymers” Macromolecules, vol. 34, 2001, pp. 4124-4129.

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