Acidic o-nitroaromatics as photoinhibitors of polymerization in positive working films

摘要

A photopolymerizable coating composition comprisingP P (1) a nongaseous, ethylenically unsaturated, polymerizable compound, PP(2) a specified acidic o-nitroaromatic compound, and PP(3) an organic, radiation-sensitive, free- radical generating system which is useful for making a positive or negative polymeric image on a substrate.