Shin-etsu Chemical Co., Ltd.

Nsk-warner Kabushiki Kaisha

Tadashi Takahashi

Mitsuhiro Takarada

Yuji Yoshikawa

Shigeki Umezawa

Yoshio Okamura

Shun Kitahara

Yoshiteru Kobayashi

Fumimasa Muramatsu

A wet frictional material having a high heat resistance, excellent durability and superior initial conformability. The wet frictional material contains a fiber base material, a filler, a frictional adjustment agent and a thermosetting synthetic resin. The thermosetting synthetic resin comprises a silicone resin represented by the following average formula. The silicone resin contains a trifunctional unit (RSiO.sub.3/2) (where R represents a substituted or unsubstituted monovalent hydrocarbon group) in an amount of from 40 to 100 mol % of units constituting the silicone resin:

Wet frictional material

A process for preparing a polyester-modified silicone resin comprises mixing an alkoxysilane and/or its hydrolyzate, i.e. an alkoxysiloxane, and a polyester resin having at least two hydroxyl groups in the molecule, and subjecting the mixture to hydrolysis and polycondensation reactions in the presence of an acid catalyst. This process is performed by a continuous one-stage reaction sequence including hydrolysis, polycondensation and modification and is simplified. A composition comprising the polyester-modified silicone resin is also described. The composition comprising organozinc compounds along with the modified silicone resin is significantly improved in heat resistance and color-difference.

Process for preparing a polyester-modified silicone resin and a curable

A coating composition to form a coat on the surface of electrophotographic carrier which imparts excellent durability, moisture resistance and flowability to the carrier comprises:

Coating composition for electrophotographic carrier

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Annaka, Japan

Tadashi Takahashi