Aqueous silicone emulsions crosslinkable into elastomeric state
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United States of America Patent
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Sep 5, 1989
Grant Date -
N/A
app pub date -
Oct 20, 1988
filing date -
Oct 20, 1987
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Expired
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Abstract
Thixotropic silicone emulsions crosslinkable into elastomeric state upon removal of water therefrom, e.g., to fabricate elastomer seals for the construction industry, have a pH of from 4 to 8 and a solids content of at least 50%, and contain: (A) 100 parts of an oil-in-water emulsion of an .alpha.,.omega.-(dihydroxy)polydiorganosiloxane, and a stabilizing amount of at least one anionic or nonionic surface-active agent, or mixture thereof; (B) 1 to 15 parts of a siliceous reinforcing filler in powder form; (C) 0 to 250 parts of an inorganic filler other than the siliceous filler (B); (D) 0.01 to 2 parts of a catalytic tin compound; and (E) 0.1 to 5 parts of boric oxide, a boric acid or a borate.
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