Radiation-sensitive composition containing a vinyl pyrrolidone polymer and use thereof in lithographic printing plates
申请人:EASTMAN KODAK COMPANY
公开号:EP0472228A1
公开(公告)日:1992-02-26
Radiation-sensitive compositions which are especially useful in the production of negative-working lithographic printing plates comprise a photocrosslinkable polymer containing the photosensitive group
as an integral part of the polymer backbone and, in an amount sufficient to improve the properties of the composition, a polymer of vinyl pyrrolidone. The polymer of vinyl pyrrolidone improves the properties of the radiation-sensitive composition in regard to such factors as shelf life, image contrast, and developability and thereby provides a superior lithographic printing plate. In a preferred embodiment of the invention, the radiation-sensitive composition also contains a copolyester of an unsaturated dicarboxylic acid and an oxyalkylene ether of an alkylidene diphenol. The aforesaid copolyester provides the further advantage of greatly enhanced ink receptivity.
特别适用于生产底片工作平版印刷板的辐射敏感性组合物包括一种含有光敏基团的光交联聚合物
作为聚合物主链不可分割的一部分的可光交联聚合物,以及一种乙烯基吡咯烷酮聚合物,其用量足以改善组合物的性能。乙烯基吡咯烷酮聚合物可改善辐射敏感组合物在保存期限、图像对比度和显影性等方面的性能,从而提供优质的平版印刷板。在本发明的一个优选实施方案中,辐照感光组合物还含有不饱和二羧酸和亚烷基二苯酚的氧亚烷基醚的共聚物。上述共聚聚酯的另一个优点是大大提高了油墨的接受性。