Patent ID: 7169534

Claim:
A radiation-sensitive element comprising (a) an optionally pretreated substrate; (b) a radiation-sensitive coating comprising (i) at least one photoinitiator or sensitizer, which is capable of absorbing radiation of a wavelength in the range of 250 to 1,200 nm; (ii) at least one oligomer A of formula (I) wherein X 1 , X 2 and X 3 are independently C 2 –C 18 alkanediyl or C 6 –C 20 arylene, A 1 , A 2 and A 3 are independently —(CHR′—CHR′—O) k —CH 2 —CH═CH 2 or a fragment represented by formula Ia wherein k is an integer from 0 to 10, each R′ is independently a hydrogen atom or CH 3 , each R 2 is independently a hydrogen atom, R 1 is a hydrogen atom or C 1 –C 12 alkyl and r, s and t independently are 0 or 1, with the proviso that in each fragment A 1 , A 2 and A 3 at least one R 2 is not a hydrogen atom if A 1 , A 2 and A 3 are all a fragment represented by formula (Ia), and (iii) at least one oligomer B, which is a phosphazene, represented by formulas (II) or (IIa): wherein Z 1 , Z 2 , Z 3 , Z 4 , Z 5 and Z 6 are independently —O— or —NR—, R is a hydrogen atom or C 1 –C 12 alkyl, n is greater than 3 and B 1 , B 2 , B 3 , B 4 , B 5 and B 6 are fragments represented by formulas (III)–(VIII) wherein R 3 is a hydrogen atom or C 1 –C 12 alkyl, R 4 is C 2 –C 12 alkanediyl and R 5 and R 6 are independently a hydrogen atom or C 1 –C 12 alkyl; and (c) optionally, at least one additive comprising coinitiators which form free radicals after the excitation of the initiator or sensitizer with radiation of a wavelength of 250 to 1,200 nm, binders, thermopolymerization inhibitors, dyes, plasticizers, chain transfer agents, leuco dyes, inorganic fillers or surfactants.