Asahi Kasei Kogyo Kabushiki Kaisha

Jyoji Ihata

Yasuki Shimamura

A photosensitive and heat-sensitive polymer having conjugated polyenes and sulfonic acid groups and an absorbance ratio of a strong band in the region of 1200 cm.sup.-1 to 1300 cm.sup.-1 assignable to sulfonic acid groups adjacent to conjugated polyenes of at least 3 sequence lengths to a strong band near 1050 cm.sup.-1 assignable to sulfonic acid groups in the IR spectrum of at least 0.6. The photosensitive and heat-sensitive polymer is obtained by the sulfonation of a polymer of an ethylenically unsaturated monomer having a number average molecular weight of at least 10,000 or a polymer having conjugated polyenes and a number average molecular weight of at least 10,000 and selected from the group consisting of (a) a homopolymer or copolymer of an olefin having 2 to 8 carbon atoms; (b) a homopolymer or copolymer of a halogenated olefin having 2 to 3 carbon atoms and a copolymer of the halogenated olefin and an olefin having 2 to 8 carbon atoms; (c) a homopolymer or copolymer of an olefin having a polar group and a copolymer of the olefin and an olefin having 2 to 8 carbon atoms; (d) a crosslinked aromatic polymer comprising 50 to 98% by mol of a monovinyl or monovinylidene aromatic monomer unit and 2 to 50% by mol of a polyvinyl monomer unit; and (e) a homopolymer or copolymer having conjugated polyenes of at least 3 sequence lengths.

Photosensitive and heat-sensitive polymers, process for producing the

A photosensitive and heat-sensitive polymer having conjugated polyenes and sulfonic acid groups and an absorbance ratio of a strong band in the region of 1200 cm.sup.-1 to 1300 cm.sup.-1 assignable to sulfonic acid groups adjacent to conjugated polyenes of at least 3 sequence lengths to a strong band near 1050 cm.sup.-1 assignable to sulfonic acid groups in the IR spectrum of at least 0.6. The photosensitive and heat-sensitive polymer is obtained by the sulfonation of a polymer of an ethylenically unsaturated monomer having a number average molecular weight of at least 10,000 or a polymer having conjugated polyenes and a number average molecular weight of at least 10,000 and selected from the group consisting of (a) a homopolymer or copolymer of an olefin having 2 to 8 carbon atoms; (b) a homopolymer or copolymer of a halogenated olefin having 2 to 3 carbon atoms and a copolymer of the halogenated olefin and an olefin having 2 to 8 carbon atoms; (c) a homopolymer or copolymer of an olefin having a polar group and a copolymer of the olefin and an olefin having 2 to 8 carbon atoms; (d) a crosslinked aromatic polymer comprising 50 to 98% by mol of a monovinyl or monovinylidene aromatic monomer unit and 2 to 50% by mol of a polyvinyl monomer unit; and (e) a homopolymer or copolymer having conjugated polyenes of at least 3 sequence lengths. The photosensitive and heat-sensitive polymer is useful for information recording materials capable of being recorded by a laser beam or a thermal head for preparing printing plates, especially offset printing plates.

A photosensitive and heat-sensitive polymer having conjugated polyenes and sulfonic acid groups and an absorbance ratio of a strong band in the region of 1200 cm.sup.-1 to 1300 cm.sup.-1 assignable to sulfonic acid groups adjacent to conjugated polyenes of at least 3 sequence lengths to a strong band near 1050 cm.sup.-1 assignable to sulfonic acid groups in the IR spectrum of at least 0.6. The photosensitive and heat-sensitive polymer is obtained by the sulfonation of a polymer of an ethylenically unsaturated monomer having a number average molecular weight of at least 10,000 or a polymer having conjugated polyenes and a number average molecular weight of at least 10,000 and selected from specified polymers and copolymers. The photosensitive and heat-sensitive polymer is useful for information recording materials capable of being recorded by a laser beam or a thermal head for preparing printing plates, especially offset printing plates.

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Mishima, Japan

Jyoji Ihata