申请人:TOKYO OHKA KOGYO CO., LTD.
公开号:EP0950923A1
公开(公告)日:1999-10-20
The present invention provides a photosensitive resin composition which comprises an urethane resin obtained by reacting (A) a carboxyl group-containing polymer having an acid value of 30 mg KOH/g or more and a glass transition temperature of 30°C or more, (B) a compound having two isocyanate groups in one molecule, (C) a compound having two hydroxyl groups in one molecule and (D) a photopolymerizable unsaturated monomer having one hydroxyl group in one molecule, and a photopolymerization initiator, and a resin plate for flexography using the photosensitive resin composition, whereby the photosensitive resin composition having water developing properties, high in sensitivity and impact resilience, and excellent in water resistance, ink resistance and press life of a hardened portion forming a line pattern area of a printing plate material and the resin plate for flexography prepared by the use of the photosensitive resin composition can be provided.
本发明提供了一种感光树脂组合物,它包括由以下物质反应得到的聚氨酯树脂:(A)酸值大于等于30毫克KOH/克且玻璃化温度大于等于30℃的含羧基聚合物;(B)一个分子中含有两个异氰酸酯基团的化合物;(C)一个分子中含有两个羟基的化合物;(D)一个分子中含有一个羟基的可光聚合不饱和单体、和一种光聚合引发剂,以及一种使用该感光树脂组合物的柔性版印刷用树脂版,从而可以提供具有水显影特性、高灵敏度和高冲击回弹性,以及在形成印刷版材料的线条图案区域的硬化部分和使用该感光树脂组合物制备的柔性版印刷用树脂版中具有优异的耐水性、耐油墨性和印刷寿命的感光树脂组合物。