Asahi Kasei Kogyo Kabushiki Kaisha

Asahi Kasei Kabushiki Kaisha

Asahi Kasei Chemicals Corporation

Katsuya Nakano

Yoshifumi Araki

Takeshi Aoyagi

Yutaka Usubuchi

Kazuyoshi Yamazawa

Keiichi Haraguchi

Takeshi Oguri

Disclosed is a photosensitive resin composition for flexographic printing plates containing a thermoplastic elastomer (A), a polymer (B) mainly composed of butadiene, a photopolymerizable unsaturated monomer (C) and a photopolymerization initiator (D) (which composition substantially contains no hydrophilic polymers). In this photosensitive resin composition for flexographic printing plates, the number average molecular weight of the polymer (B) is not less than 10,000 and not more than 60,000, and the 1, 2 vinyl content in the total double bonds of the polymer (B) is not more than 25%.

Photosensitive resin for flexographic printing plate

A water-developable, photosensitive resin plate for letterpress printing which comprises a photosensitive resin layer and a protective film contacting therewith, wherein the protective film consists of at least two layers, of which one is a surface layer containing a resin having a water absorption of 5% by weight or less and the other is an intermediate layer containing a water-soluble resin in contact with the photosensitive resin layer.

Photosensitive resin plate for letterpress printing

A sulfonic acid group-containing polyurethane produced from a sulfonic acid group-containing polyamide diol and/or a sulfonic acid group containing polyester diol, a dihydroxyhydrocarbon having a specific molecular weight and a diisocyanate. This polyurethane has not only high hydrophilicity but also excellent mechanical strength, excellent heat resistance, low permanent tensile set and low hardness, which are required for the base polymer for a photosensitive resin composition to be used for producing a flexographic printing plate. Further, a photosensitive resin composition containing such a sulfonic acid group-containing polyurethane has excellent photosensitivity and in addition, has excellent properties such that after the photosensitive resin composition has been exposed to actinic rays through an image-bearing transparency, the development of the exposed composition can be performed with water or an aqueous alkali solution. From this photosensitive resin composition, a flexographic printing plate having excellent printing resistance, ink resistance and mechanical properties can be obtained.

Sulfonic acid group-containing polyurethane and a photosensitive resin

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Fuji, Japan

Katsuya Nakano