Toyobo Co., Ltd.

Toyobo Mc Corporation

Hiroto Yamada

Kazuya Yoshimoto

Yukimi Yawata

A developer composition for a water-developable photosensitive flexographic printing original plate is disclosed, containing (a) a nonionic surfactant composed of monoalkyl ether and/or monoalkyl ester of polyethylene glycol, wherein a number of carbon atoms of the alkyl group therein is 8 to 19, and wherein an HLB value thereof is 11 to 16; and (b) one or more anionic surfactants selected from the group consisting of oleic acid metal salt, lauric acid metal salt, dodecylbenzene sulfonic acid metal salt and lauryl sulfate metal salt, wherein a content ratio of (a):(b) is 25:75 to 75:25 (mass ratio), and wherein a brushing friction coefficient on a surface of a printing original plate is 0.60 to 0.75[−], when measured in an aqueous developer containing 1% by mass of the developer composition and 99% by mass of water.

Developer composition for flexographic printing plate, developer, and method of manufacturing printing original plate

A photosensitive resin composition for CTP flexographic printing original plate containing at least a hydrophobic polymer obtained from water-dispersible latex (A), a hydrophilic polymer (B), a photopolymerizable unsaturated compound (C), a photopolymerization initiator (D), and if necessary, rubber (E), characterized in that, the photopolymerizable unsaturated compound (C) comprises a photopolymerizable oligomer containing no hydroxyl group (C-1), a hydroxyl group-containing photopolymerizable monomer having a pentaerythritol skeleton, a dipentaerythritol skeleton or a glycerol skeleton (C-2) and, optionally, a photopolymerizable monomer containing no hydroxyl group (C-3). The content of the hydroxyl group-containing photopolymerizable monomer (C-2) is 1 to 20% by mass of the photosensitive resin composition. The content of the rubber (E) is preferably 0.5 to 15% by mass of the photosensitive resin composition.

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Okayama, Japan

Hiroto Yamada