Toray Industries, Inc.

Katsutoshi Sasashita

Shigetora Kashio

Shinji Tanaka

Masanao Isono

Tomio Adachi

A photosensitive resin composition comprising (A) a polymer as derived from its latex dispersion in water, (B) a hydrophilic photopolymerizable monomer, (C) rubber, and (D) a photopolymerization initiator, especially that as prepared by mixing (A&prime;) a latex dispersion in water and (B) a hydrophilic photopolymerizable monomer to give a component (E), followed by kneading under heat the resulting component (E) with (C) rubber and (D) a photopolymerization initiator, can be developed with a developer not containing additives such as surfactants and alkali metal salts. The composition has good image reproducibility and is favorable to flexographic printing plates.

Photosensitive resin composition, method for producing photosensitive resin composition, and printing plate material

Disclosed are a photosensitive resin composition for printing plate materials, which comprise a polymer having an ionic group and a polymerizable group in the side chain, and a printing plate material as formed by applying the composition onto a support. The hardness of the photosensitive layer of the composition is hardly influenced by temperature and water, and the layer, after having been developed, has good resistance to aqueous ink.

Photosensitive resin composition with polymer having an ionic group and

Photosensitive resin compositions for printing plates and photosensitive

This invention relates to a photosensitive polymer composition containing as essential components (A) a soluble polymer, (B) a photopolymerizable compound having an ethylenic double bond in the molecule there of and (C) a photopolymerization initiator, the soluble polymer comprising a water-soluble polymer and an alcohol-soluble polymer, the composition having a sea-and-islands structure comprising sea containing the water-soluble polymer as a main component and islands containing the alcohol-soluble polymer as a main component, and the islands are independently in the form of sphere or oval having a diameter of 0.1 to 20 microns. The photosensitive polymer composition affords a printing plate having high image reproducibility and water-developability and capable of withstanding the coating of an aqueous polymer according to a printing method.

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Okazaki, Japan

Katsutoshi Sasashita