(ETHYLENE, VINYL ACETAL) COPOLYMERS AND THEIR USE IN LITHOGRAPHIC PRINTING PLATE PRECURSORS

摘要

An (ethylene, vinyl acetal) copolymer is disclosed which comprises (i) a plurality of ethylenic moieties A having a structure according to the following formula (I) wherein R2 and R3 independently represent hydrogen, a halogen or an optionally substituted linear, branched or cyclic alk(en)yl group, or an optionally substituted aromatic or heteroaromatic group; and (ii) a plurality of acetal moieties B having a structure according to the following formula (II) wherein L1 represents a divalent linking group; x = 0 or 1; and R1 represents an optionally substituted aromatic or heteroaromatic group including at least one hydroxyl group; and (iii) a plurality of acetal moieties C and/or moieties D which are different from the acetal moieties B, and which include at least one nitrogen atom.