Toyobo Co., Ltd.

Daiki Yoshioka

Yukimi Yawata

Kazuya Yoshimoto

A method is disclosed for producing a flexographic printing plate from a flexographic printing original plate provided with a photosensitive resin layer comprising a photosensitive resin composition containing at least (A) a hydrophobic polymer comprising a water-dispersible latex, (B) a photopolymerizable compound and (C) a photopolymerization initiator, wherein the method comprises a main exposure step, a development step and a post-exposure step, characterized in that a treatment solution containing a first amino-modified silicone having an amine equivalent of 1000 g/mol or less and a second amino-modified silicone having an amine equivalent of 3000 g/mol or more in a mass ratio of from 2.5:1 to 1:6 is contacted with the whole surface of the flexographic printing plate.

Method for producing flexographic printing plate

A developer composition for a printing plate containing (a) alkali metal salt of saturated fatty acid having carbon number of 12 to 18 and (b) alkali metal salt of unsaturated fatty acid having carbon number of 12 to 18 in a weight ratio of from 20:80 to 80:20 in terms of (a):(b). The developer composition may further contain an alkali agent (c). In this case, a weight ratio of (a):(b) may be from 20:80 to 80:20, and the alkali agent (c) may be contained in amount of 0.01 to 10 part(s) by weight to 100 parts by weight in total of the components (a) and (b).

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Okayama, Japan

Daiki Yoshioka