Radiation-sensitive mixture and recording material based on oligomeric maleates and fumarates

Abstract

A radiation-sensitive mixture is disclosed which contains as essential constituents a) at least one thermoplastic, elastomeric block copolymer of the formulae (A-B).sub.m -A, (B-A).sub.m+a -B, (A-B).sub.m+1 or (A-B).sub.o Y, in which A is a thermoplastic, nonelastomeric polymer block having a glass transition temperature of 25.degree. C. or above and B is an elastomeric polymer block having a glass transition temperature of 10.degree. C. or below, Y is Sn or Si, m is an integer from 1 to 10, and o is 2 if y is Sn, or 4 if y is Si, b) at least one ethylenically polyunsaturated compound, and c) a photopolymerization initiator, wherein at least one of the ethylenically polyunsaturated compounds corresponds to the formula I ##STR1## where R is a straight-chain or branched alkyl radical, X is a straight-chain alkylene or cycloalkylene, it being possible for individual methylene groups to be substituted by --O--, --S--, carbonyl or carbonyloxy groups, and n is 1 to 5. The mixture can be used to produce relief and flexographic printing plates having a high Shore A hardness. The recording layers on which the printing plates are based are stable on storage and exhibit a high photosensitivity.

Dependencies are inferred from the claim text.