Room temperature vulcanizable silicon rubber composition
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United States of America Patent
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May 12, 1992
Grant Date -
N/A
app pub date -
Apr 26, 1990
filing date -
Apr 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A room temperature vulcanizable silicone rubber composition is described. The composition comprises an organopolysiloxane which is blocked with a hydroxyl group or hydrolyzable group at ends of the molecular chain thereof, fumed silica which is surface treated with a monoorganosilane of the general formula, R.sup.1 SiY.sub.3, or a monoorganopolysilazane of the general compositional formula, R.sup.1 Si(NH).sub.3/2, wherein R.sup.1 in each formula represents a monovalent hydrocarbon group and each Y represents a hydrolyzable group and which has a specific area of not less than 50 m.sup.2 /g, and an organosilicon compound of the general formula, R.sup.2.sub.1 SiZ.sub.4-1, wherein R.sup.2 represents an unsubstituted or substituted monovalent hydrocarbon group, Z represents a hydrolyzable group, and 1 is a value of 0 or 1, or its partially hydrolyzed product. The composition may further comprise a promoter for the vulcanization.
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