| 摘要 |
A lithographic printing plate master, and plate making method using the same, that enable plates to be made directly from digital data of devices such as computers by printing using a laser beam, and specifically enable development on a printer, have superior developability, and are highly sensitive, with satisfactory plate durability and dirt resistance. The lithographic printing plate master has a support member, an undercoat layer, and an image recording layer, in that order, and enables deletion of an unexposed section by supplying printing ink after image exposure on the image recording layer, the image recording layer containing (A) a polymerization initiator, (B) a polymeric compound, and (C) a binder polymer, characterized in that the undercoat layer contains a copolymer (D1) having (a1) repeating units with a zwitterion structure, and (a2) repeating units with a structure that is congruent with the support body surface, and a copolymer (D2) having (a3) repeating units with ethylenically unsaturated bonds, and (a2) repeating units with a structure that is congruent with the support body surface, the weight of the copolymer (D1) being 5 to 95% with respect to the total weight of the copolymers (D1) and (D2). |
