PURPOSE: The titled composition, useful as a coating material for a material having stretchability, e.g. a rubber or leather, capable of giving a film with a high curing rate, improved flexibility and elongation, and comprising an acrylic oligomer of specific structural formula and a photosensitizer.

CONSTITUTION: A composition comprising (A) 100pts.wt. an acrylic oligomer expressed by the formula (R1 is H or methyl, and one of them is H; R2 and R3 are 2W3C alkylenes; x and y are integers and x+y=4W6; Z is 1W5; X is bifunctional aromatic ring; Y is residue after removal of the carboxyl group from a saturated dibasic acid) and (B) 1W5pts.wt. a photosensitizer, preferably dibenzosuberone. The constituent (A) is preferably obtained by coesterifying a mixture of (i) a saturated dibasic acid, e.g. adipic acid, with (ii) an addcut of a bifunctional aromatic polyhydric alcohol, e.g. bisphenol A, with an alkylene oxide, preferably 4W6 moles, and (iii) acrylic acid.