The present invention is to prevent the rapid viscosity rise generated at the time of dissolving or dispersing in a solvent a polymer obtained by reacting a material polymer having an acidic functional group and a hydroxyl group in the principal chain part with an isocyanate compound, in particular, a photo-curing polymer obtained by reaction with a radical polymerizable group-containing isocyanate compound. A highly stable polymer can be obtained by reacting a material polymer having a principal chain including at least a component unit having an acidic functional group and a component unit having a hydroxyl group with an isocyanate compound, and further reacting the same with an alcohol. Moreover, by producing a material polymer using a non-nitrile azo-based or peroxide-based polymerization initiator and/or introducing an isocyanate compound using a polymerization inhibitor selected from the compounds represented by the above-mentioned formulae (10) and (16), the transparency can be improved. A photo-curing polymer obtained in the present invention is suited for forming a protection film of a color filter and a column-like spacer of a liquid crystal panel.
本发明的目的是防止在溶剂中溶解或分散通过使主链部分具有酸性官能团和羟基的材料聚合物与
异氰酸酯化合物反应而得到的聚合物,特别是通过与含自由基可聚合基团的
异氰酸酯化合物反应而得到的光固化聚合物时产生的快速粘度上升。将一种主链至少包括一个具有酸性官能团的组成单元和一个具有羟基的组成单元的材料聚合物与
异氰酸酯化合物反应,并进一步与醇反应,可以得到一种高度稳定的聚合物。此外,通过使用非腈偶氮基或过氧化物基聚合
引发剂和/或使用从上述式(10)和(16)所代表的化合物中选出的聚合
抑制剂引入
异氰酸酯化合物来生产材料聚合物,可以提高透明度。本发明获得的光固化聚合物适用于形成彩色滤光片的保护膜和液晶面板的柱状间隔。