| 摘要 |
PROBLEM TO BE SOLVED: To obtain a photopolymerizable composition developable by an aqueous solution of alkali and suitable for metal foil precise processing for manufacturing a printed wiring board and a metal mask by incorporating a thermoplastic polymer having carboxyl groups and a specified compound and a photopolymerization initiator each in a specified weight percentage. SOLUTION: This photopolymerizable resin composition comprises (a) 20-90 wt.% of the thermoplastic polymer having a weight average molecular weight of 20,000-500,000 having the carboxyl groups in an acid equivalent of 100-600, (b) 3-50 wt.% of the compound represented by the formula, and (c) 0.01-20 wt.% of the photopolymerization initiator. The thermoplastic polymer (a) is contained, preferably, in an amount of 40-60 weight %, and when <20 weight %, it is feared that film formability and tenting film strength and the like may be deteriorated, and when >70 weight %, it is feared that a photohardened film may be made brittle and close contact between the film and a substrate may be impaired and sufficient etching resistance and image forming performance may be not attained. |
