Flexographic printing plate

[0170]

[0171]80 parts by mass of EPDM: MITSUI EPT1045 (ethylene-propylene-diene copolymer, ethylene content: 58% by mass, diene content: 5% by mass, kind of diene: dicyclopentadiene (DCPD), manufactured by Mitsui Chemicals, Inc.) as a polymer, 12 parts by mass of carbon black #45L (nitrogen adsorption specific surface area: 125 m2 / g, DBP absorption: 45 cm3 / 100 g, manufactured by Mitsubishi Chemical Corporation.) as a photothermal converting agent, and 5 parts by mass of PERCUMYL D40 (dicumyl peroxide (40% by mass), manufactured by NOF CORPORATION) were kneaded to prepare a resin composition A. In the following first table, the formulation using the resin composition A is expressed as “Formulation A”, and cases of using resin compositions B to F described later are expressed as “Formulations B to F” respectively.

[0172]

[0173]The obtained resin composition A was crosslinked by heating at a pressure of 10 MPa and 160° C. for 20 minutes using a heating press machine (MP-WCL, manufactured

[0182]A flexographic printing plate was manufactured in the same manner as in Example 1except that as the recessed portion forming pattern, instead of Pattern I, Pattern II was used.

[0183]A flexographic printing plate was manufactured in the same manner as in Example 1 except that as the recessed portion forming pattern, instead of Pattern I, Pattern III was used.