Patent ID: 8546480

Claim:
A method for producing a relief printing plate, comprising: providing a relief printing plate precursor for laser engraving, comprising a relief forming layer formed by thermally crosslinking a resin composition comprising (A) a polymer having an ethylenically unsaturated bond in a side chain wherein the polymer is an acrylic resin or a polyvinyl acetal, (B) carbon black, and (C) a thermopolymerization initiator, wherein the (A) polymer having an ethylenically unsaturated bond in a side chain is a polymer having a carbon-sulfur bond between the main chain and the ethylenically unsaturated bond in a side chain, and wherein the ethylenically unsaturated bond is an acryloyl group, a methacryloyl group or a styryl group; and subjecting the relief forming layer in the relief printing plate precursor to laser engraving.