PROBLEM TO BE SOLVED: To impart a high tent film strength, high flexibility, adhesion, peelability and a high resolution and to suppress the occurrence of a development scum by using a binder polymer, a photo-(addition-)polymerizable α,β- ethylenically unsatd. compd. and a photoinitiator. SOLUTION: The photo image forming compsn. contains a binder polymer (A), an addition-polymerizable nongaseous α,β-ethylenically unsatd. compd. (B) and a photoinitiator (C). The amt. of the component A is 30-80 wt.% of the total amt. of the components A and B, the amt. of the component B is 20-70 wt.% of the total amt. of the components A and B and the amt. of the component C is 0.1-20 wt.% of the total amt. of the components A and B. When the component B is a urethane oligomer represented by the formula X-R, the amt. of the oligomer is 1-70 wt.% of the total amt. of the components A and B. In the formula, X is a multivalent aliphatic, alicyclic or arom. hydrocarbon group, a multivalent isocyanurate group or a multivalent biuret group and more than two symbols R are independent groups.
NEGATIVE TYPE PHOTO IMAGE FORMING COMPOSITION