Photopolymerisable polyvinyl alcohols including a group of formula
where R₁ represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, or a hydrogen atom; R₂ represents a substituted or unsubstituted alkyl group, a primary, secondary or tertiary amino group, a cyano, hydroxy or nitro group, a halogen or hydrogen atom or, together with the pyridine ring to which it is attached, part of a quinolyl group; R₃ represents a chlorine or hydrogen atom or, together with the benzene ring to which it is attached, part of a naphthyl group; and X represents an anion, and photocurable compositions for producing screen printing stencils including such polyvinyl alcohol derivatives. Compositions of the invention show high light sensitivity with low levels of photocrosslinkable groups' grafted to the polyvinyl alcohol.
可光聚合的聚
乙烯醇,包括式中的基团
其中 R₁ 代表取代或未取代的烷基、取代或未取代的芳烷基或氢原子; R₂ 代表取代或未取代的烷基、伯
氨基、仲
氨基或叔
氨基、
氰基、羟基或硝基、卤素或氢原子,或与所连接的
吡啶环一起代表
喹啉基的一部分;R₃ 代表
氯原子或氢原子,或与所连接的苯环一起,代表
萘基的一部分;X 代表阴离子,以及用于生产丝网印刷网版的光固化组合物,包括此类聚
乙烯醇衍
生物。本发明的组合物显示出较高的光敏性,而接枝到聚
乙烯醇上的可光交联基团的含量较低。