Photocrosslinkable polymers which have a mean molecular weight of not less than 5,000 and contain, in side chains, thioxanthone groupings of the formula ##STR1## and, in side chains, imidyl groupings of the formula ##STR2## in which X, Y, Z, n, G.sub.1 and G.sub.2 are as defined in the patent claim, are suitable for the production of highly light-sensitive image materials, for the production of printing plates for the offset printing process and in particular as so-called photoresists for the production of printed circuits. The thioxanthone groupings (I) act as sensitizers for the photocrosslinkable groups of the polymer, so that it is not necessary to add further sensitizers.
具有平均分子量不低于5,000并且在侧链中含有公式##STR1##的
噻吩酮基团和公式##STR2##的
咪唑基团的光交联聚合物,其中X、Y、Z、n、G.sub.1和G.sub.2如专利要求中所定义,适用于生产高度光敏感的图像材料,用于制作胶印印刷版,特别是作为所谓的光阻剂用于制作印刷电路板。
噻吩酮基团(I)作为聚合物的光交联基团的敏化剂,因此不需要添加其他敏化剂。