Japan Synthetic Rubber Co., Ltd.

Bridgestone Tire Company Limited

Isao Nagaoka

Koei Komatsu

Hiroshi Kawakami

Mitsuo Kurokawa

Yukio Tsukagawa

Fumitake Imaizumi

Hiroharu Ikeda

Yasuyuki Takimoto

Tooru Shibata

Kan Mori

Tatsuhiko Kikuchi

Sigeo Kawatani

Hidefumi Kusuda

A process for producing a maleic anhydride adduct of high molecular weight 1,2-polybutadiene by contacting with heat maleic anhydride with high molecular weight 1,2-polybutadiene in the absence of a radical initiator in a halogenated aromatic hydrocarbon solvent. The adduct obtained by this process has a high molecular weight of more than 10,000 and is quite free from gel. Said process enables the addition of maleic anhydride in any desired proportion.

Process for producing maleic anhydride adduct of high molecular weight

A suction device for an oil separation tank mounted on a floating body comprises a liquid piping structure for transporting floating oil from the oil separation tank into a storage tank and a vacuum piping structure for always retaining floating oil in the oil separation tank at a suction state, and may automatically control an intermittent suction operation.

Suction device for an oil separation tank

A device for pulling up and paying out an oil boom comprises a structural frame, a pair of end pulleys horizontally journaled on the frame, an endless belt engaged with the end pulleys and having a plurality of engaging projections for oil boom and a pusher member for slightly urging the oil boom against the endless belt, the pusher member being resiliently supported by a supporting member with a proper distance held between the bottom portion of the pusher member and the upper surface of the endless belt.

Device for pulling up and paying out an oil boom

A photosensitive composition comprising (1) a maleic anhydride adduct of 1,2-polybutadiene having a molecular weight of 10,000 or higher, (2) at least one photosensitizer and/or at least one photosensitive crosslinking agent, and, if necessary, (3) at least one acrylic monomer. This composition can be developed with water or a polar solvent such as an alcohol, and its layer formed on a support provides a printing plate. When the acrylic monomer is contained, the composition is suitable for use in flexographic printing.

Photosensitive composition using maleic anhydride adduct of a 1,2

High molecular weight cis-1,4-polyisoprene is produced by contacting isoprene with a catalyst formed by admixing (A) a titanium tetrachloride, (B) a trihydrocarbylaluminum and (C) a beta-diketone. The activity of this ternary catalyst is not adversely affected by such impurities as cyclopentadiene that are contained in the feed stock isoprene.

Catalytic production of a high molecular weight cis-1,4-polyisoprene

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Yokohama, Japan

Isao Nagaoka