| abstract |
PURPOSE:To provide a recording head having a low cost, high accuracy, high reliability and excellent durability by incorporating specific graft copolymerizable polymer, specific linear polymer, compound esterified with acrylic acid at the end of polyurethane molecule chain, and optical initiator. CONSTITUTION:Composition contains graft copolymerizable polymer in which branched chain having a structure unit derived from one type of monomer of monomers represented by formulae x and y is added to backbone chain having a structure unit derived from monomers selected from a group consisting of alkylmethacrylate, acrylonitrile and styrene as a main ingredient, its number- average molecular weight is 5000 or more, and its weight-average molecular weight is 50,000 or less, specific linear polymer, compound esterified with acrylic acid and polyurethane molecule chain end, and optical initiator. In the formulae, R<1> is hydrogen, 1-3C alkyl group or hydroxyalkyl group, R<2> is hydrogen, 1-4C alkyl group or acyl group. |