C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/5310, 400/72
C08L 83/04 (2006.01) C08K 9/06 (2006.01)
Patent
CA 1161979
ABSTRACT OF THE DISCLOSURE A room temperature vulcanizable cornposition which is stable under anhydrous conditions, but when exposed to atmospheric moisture cures to an elastomeric solid is provided herein. It comprises (1) an organo- polysiloxane of the formula Image (2) an organosilicon compound selected from the group consisting of silanes of the formula R"nSi(OR')4-n and siloxanes of the formula Image (3) a titanium compound of the formula Ti(OR')4 or par- tial hydrolyzates thereof in which R is selected from the group consisting of monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals having from 1 to 18 carbon atoms and cyanoalkyl radicals, R' is an aliphatic hydrocarbon radical having up to 10 carbon atoms, R" is selected from the group consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals having from 1 to 10 carbon atoms, a has an average valtle of from 1.9 to 2.0, b has a value greater than 10, m has a value of at least 2, n has a value of 0.1 or 2, y has a value of from 0 to 10 and z has a value of 1, 2 or 3, with the proviso that the R' radicals in the siloxane, the organosilicon compound and the titanium compound must be identical and (4) carbon black which has been treated with a hydrophobic agent to impart hydrophobic properties thereto, in which the treated carbon black is inert to the R' radicals linked to the siloxane, the organosilicon compound and the titanium compound, the hydrophobic agent comprising a silicon compound capable of imparting hydrophobic properties thereto. Preferably, the hydrophobic agent is selected from the group consisting of cyclic alkyl polysiloxanes and silicon compounds of the formula (R'''3Si)eZ and R'''e,SiZ'4-e' in which R''' is selected from the group consisting of monovalent hydro- carbon radicals and halogenated monovalent hydrocarbon radicals, Z and Z' are selected from the group consisting of halogen, hydrogen and a radical of the formula -OR"", -NR""X' and -ONR"" and when e is 2, then Z may be selected from the group consisting of -O- and NX', R"" is selected from the group consisting of hydrocarbon radicals and substituted hydrocarbon radicals, X' is selected from the group consisting of hydrogen and R"", e is 1 or 2 and e' is 1, 2 or 3. These compositions may be employed for many applications. They are useful for caulking, coating articles, for example electronic equipment, for coating fabrics, as gasket materials, glass and metal coatings and as sealants for various substrates.
345049
Getson John C.
Neuroth Charles G.
Borden Ladner Gervais Llp
Sws Silicones Corporation
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