Shin-etsu Chemical Co., Ltd.

Shinichi Ide

Masayuki Ikeno

Noriyuki Meguriya

Takeo Yoshida

Mikio Shiono

Toshio Yamazaki

Yujiro Taira

An addition curing silicone rubber composition and a cured product thereof are provided. In this composition, amount of the low molecular weight siloxane component volatilizing from the cured product has been reduced, and as a consequence, this composition is free from the problems such as clouding or haze, contact fault, adhesion failure, and hydrophobicization of the surface caused by the deposition of the volatilized low-molecular weight siloxane component on the surrounding surfaces. More specifically, the addition curing silicone rubber composition comprises; (A) 100 parts by weight of a polyorganosiloxane containing, on average, at least two alkenyl groups which are bonded to silicon atom; (B) 0.3 to 20 parts by weight of an organohydrogenpolysiloxane containing at least two hydrogen atoms which are bonded to silicon atom (SiH functional groups) per molecule; and (C) a catalytic amount of a addition reaction catalyst, and content of the polyorganosiloxane having a degree of polymerization of up to 10 and containing at least one SiH functional group per molecule is up to 0.5% by weight in relation to the entire composition.

Addition curing silicone rubber composition and its cured product

A method of producing a base compound for a liquid fluoroelastomer which is unaffected by the storage state of the added silica powder, and yields minimal fluctuation in the viscosity between production lots. Specifically, a method of producing a base compound for a liquid fluoroelastomer containing:

Method of producing base compound for liquid fluoroelastomer

A hollow filler-containing silicone rubber composition comprising 100 parts by weight of a curable organopolysiloxane composition and 0.1-20 parts by weight of a hollow filler in the form of microballoons having a mean particle size of 10-200 &mgr;m and an elasticity of at least 10% is injection molded into a cured silicone rubber part having improved shock-absorbing properties and compression properties as well as weather resistance, freeze resistance and heat resistance inherent to silicone rubber.

Hollow filler-containing silicone rubber composition

A thixotropic agent is blended in a silicone rubber composition comprising an alkenyl radical-containing organopolysiloxane, an organohydrogenpolysiloxane, an addition reaction catalyst, and filler balloons having a specific gravity of 0.01-0.40 and a mean particle size of 1-300 .mu.m. The resulting composition effectively restrains floating and separation of the filler, remains stable and is thus suitable for injection molding.

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Annaka, Japan

Shinichi Ide