A polymer having a polymerizable group and an alkyleneoxy groups on side chains thereof, and a polymerizable composition containing the polymer. The polymerizable composition preferably contains a polymerizable compound and a polymerization initiator. Also provided is a planographic printing plate precursor having a polymerizable layer on a hydrophilic support, the polymerizable layer containing a polymer having a polymerizable on a side chain thereof. The planographic printing plate precursor can form an image without being subjected to an alkali development. An undercoat layer containing a specific copolymer may be provided between the support and the photopolymerizable layer.
一种聚合物,其侧链上具有可聚合基团和烷氧基,以及一种含有该聚合物的可聚合组合物。可聚合组合物最好含有可聚合化合物和聚合
引发剂。此外,还提供了一种平版印刷板前体,它在亲
水性支撑物上具有可聚合层,可聚合层含有侧链上具有可聚合基团的聚合物。这种平版印刷板前体无需经过碱显影即可形成图像。在支承层和可光聚合层之间可设置一个含有特定共聚物的底涂层。