Patent ID: 6596460
Filing Date: 2003-07-22
Classification: B41C,Y10S

Abstract:
A radiation-sensitive composition, comprising:(i) a copolymer comprising the units A, B, C and D, wherein A is present in an amount of 0.5 to 30 wt. % and is of the formula â€ƒwherein R is hydrogen, C1-C4 alkyl, â€”CH&boxH;CHâ€”COQH or B is present in an amount of 5 to 35 wt. % and is of the formula C is present in an amount of 10 to 55 wt. % and is of the formula â€ƒwherein R1 is an alkyl group with up to 4 carbons, which is optionally substituted by an acid group, or a phenyl group to which an acid group is attached, wherein the phenyl group optionally comprises 1 to 2 further substituents selected from halogen atoms, amino, methoxy, ethoxy, methyl and ethyl groups, or is a group Zâ€”NR2â€”COâ€”Yâ€”COOH, wherein Z is an aliphatic, aromatic or araliphatic spacer group, R2, is hydrogen or an aliphatic, aromatic oraraliphatic moiety and Y is a saturated or unsaturated chain- or ring-shaped spacer group, and unit C may have one or more occurrences in the copolymer with various moieties R1 independent of one another, and D is present in an amount of 10 to 40 wt. % and is of the formula â€ƒwherein X is C1-C6 alkylene, a 5 or 6 membered saturated carbocyclic moiety optionally substituted with one or more substituents selected from the group consisting of C1-C4 alkyl, C1-C4 alkoxy and halogen, a 5 or 6 membered saturated heterocyclic moiety which comprises in the nucleus one or more heteroatoms selected from oxygen, nitrogen and sulfur, or a group of the formula I â€ƒwherein n is an integer from 0 to 4 and each R3 is independently selected from the group consisting of C1-C4 alkyl, halogen and C1-C4 alkoxy; and (ii) a compound selected to have a maximum energy absorption wavelength in the range of about 750 to about 1120 nm and to convert absorbed energy to heat.