| 摘要 |
PURPOSE:To remove the photocured part by finely dividing said part, by incorporating a specified ethylenic unsatd. compd. in the titled composition contg. a polymer capable of supplying a film forming property which has a carboxylic group, a photopolymerization initiator and/or a photopolymerization initiator precursor. CONSTITUTION:The titled composition contains 20-90pts.wt. of the compd. shown by formula I, 10-80pts.wt. of said polymer contg. the carboxyl group, 0.1-10pts.wt. of an org. halogen compd., and 0.1-10pts.wt. of the photopolymerization initiator or its precursor based on 100pts.wt. of the titled composition. In formula I, (n) is an integer of 1-23, R1-R3 are each hydrogen atom. or methyl group. As the titled composition is removed by finely dividing in an alkaline aqueous solution, the peeling piece of the titled composition is easily removed, without twisting around the peeling roll of an automatic peeling machine usable for a manufacturing step of a print circuit board, thereby remarkably improving the workability of the titled composition. |
