Photopolymerizable grafted polyvinyl alcohols including groups of formula ##STR1## wherein n represents zero or an integer from 1 to 6, m represents zero or 1 (with the proviso that m represents zero when n represents zero), Z together with the nitrogen and carbon atoms to which they are attached represent a heterocyclic ring optionally fused to one or more benzenoid or heterocyclic rings, X.sup.- represents an anion, R' represents an alkyl group, and p represents an integer from 1 to 4. Compositions containing such grafted polyvinyl alcohols, for example for screen printing stencils, have shown high sensitivity to light.
光敏聚
乙烯醇接枝光聚合物包括以下式子中的基团:##STR1## 其中n代表0或1到6的整数,m代表0或1(当n代表0时,m代表0),Z与其连接的氮和碳原子共同表示一个杂环环,可选地与一个或多个苯环或杂环环融合,X.sup.-表示阴离子,R'表示烷基,p表示1到4的整数。包含这种接枝聚
乙烯醇的组合物,例如用于丝网印刷网版,已经表现出高灵敏度。