Kanegafuchi Kagaku Kogyo Kabushiki Kaisha

Kanegafuchi Chemical Industry Co., Ltd.

Michihide Honma

Katsuhiko Isayama

Takuzo Aida

Shohei Inoue

Masayuki Fujita

Hiroshi Wakabayashi

A curable composition is disclosed and comprises the following components. (A) 100 parts by weight of a oxypropylene polymer having a polymer main chain containing a repeating unit represented by the following formula ##STR1## and having at least one group containing a silicon atom bonded to a hydroxyl group and/or a hydrolyzable group and capable of crosslinking by forming a siloxane bond, wherein Mw/Mn thereof is not more than 1.6 and the number average molecular weight is at least 6,000, (B) from 1 to 200 parts by weight of a filler having a BET specific surface area of not higher than 10 m.sup.2 /g, and (C) from 0.1 to 20 parts by weight of a curing catalyst, said composition containing substantially no plasticizer.

Curable composition based on oxypropylene polymer

A polyalkylene oxide having unsaturated end groups. The polymer has a distribution of molecular weight Mw/Mn of not more than 1.5, and a process for the same. The polymer is useful as rubber materials, and can provide cured rubber having an excellent elongation.

Polyalkylene oxide having unsaturated end group and narrow molecular

Polypropylene oxide having unsaturated end groups is prepared by polymerizing alkylene oxide in the presence of a complex catalyst prepared by reacting an organoaluminum compound with a porphyrin compound and an active hydrogen-containing compound and converting at least one hydroxyl end groups into an unsaturated end group(s), the prepared polymer having a narrow distribution of molecular weight.

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Kobe, Japan

Michihide Honma