Dow Corning Corporation

William H Clark

Charles Edmund Skinner

Robert D Johnson

A mixture of a hydroxyl endblocked polydimethylsiloxane, ethylpolysilicate, monoorganotriacetoxysilane, organotin carboxylate, an extending filler and organic solvent provides dispersions which cure to silicone elastomers at room temperature. These compositions have long storage life and can be made into compositions which are storable for extended periods of time in a single container if kept under substantially anhydrous conditions. These compositions can be prepared extrudable or sprayable, are pigmentable, have high strengths, and are readily prepared.

Room temperature vulcanizable organic solvent dispersions of silicone

A mixture of a hydroxyl endblocked polydimethylsiloxane, ethylpolysilicate, a silane of the formula

Organic solvent dispersions of silicone elastomers

Mixing under substantially anhydrous conditions, below 60.degree.C. and under shear conditions which do not substantially alter filler structure, 100 parts by weight of a hydroxyl endblocked polydimethylsiloxane, 70 to 150 parts by weight of a finely divided agglomerated precipitated acicular calcium carbonate, 35 to 200 parts by weight of organic solvent, from 12 to 20 parts by weight of monoalkyltriacetoxysilane and a catalytic amount of an organotin carboxylate, a curable mixture which is storable under anhydrous conditions is obtained. Exposing this curable mixture to atmospheric moisture and allowing the organic solvent to evaporate provides a cured coherent solid elastomeric material which is paintable with at least one type of decorative organic base paint which forms a continuous coating over the surface and adheres thereto. Silicone rubber compositions are also described which cured to elastomers having paintable surfaces.

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Midland, MI, United States of America

William H Clark