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US 4,391,921 AGranted
Elastomeric silicone sponge
AssigneeDow Corning Corporation
InventorRobert D. Johnson
Life of this patent
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Abstract
A method of producing silicone elastomeric sponge is disclosed. The method comprises freezing an aqueous silicone emulsion, then thawing and drying to produce a silicone sponge containing irregular closed cells. The aqueous silicone emulsion comprises water, an anionically stabilized hydroxyl endblocked polydiorganosiloxane, an organic tin compound, and a colloidal silica, the emulsion having a pH of from 9 to 11.5 inclusive. The sponge produced by the method is useful as insulation and gasketing at high and low temperatures.
Claims13
A method comprising
- (a) freezing a silicone emulsion which provides an elastomeric product upon removal of the water, having a pH in the range of 9 to 11.5 inclusive, comprising water, 100 parts by weight of an anionically stabilized hydroxyl endblocked polydiorganosiloxane having an average molecular weight of greater than 10,000, an organic tin compound, and at least one part by weight colloidal silica, long enough to freeze the water and produce a solid frozen article,
- (b) thawing the solid frozen article yielding a wet elastomeric sponge-like article, and
- (c) drying the wet elastomeric sponge-like article until the water is removed and an elastomeric sponge is obtained.
Dependencies are inferred from the claim text.