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AssigneeGeneral Electric Company
InventorsMelvin D. Beers, Abe Berger, Stephen B. Hamilton, Terry G. Selin
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Novel organofunctional (ketoximino) silanes, such as acetoxyethyl tris(methylethylketoximine)silane, are provided which are useful as crosslinking agents chain-extending agents and chain-terminating agents in room temperature vulcanizable silicone elastomers. The room temperature vulcanizable compositions containing these novel organofunctional tris(ketoximino) silanes, which are stable free flowing fluids in the absence of moisture but cure to the rubbery, solid elastic state upon exposure to moisture, the method of making the same and the cured products thereof are also provided. The present room temperature vulcanizable compositions are particularly well suited for applications in conjunction with concrete (cement) substrates.
A compound having the general formula, ##EQU20## wherein R is a radical having not more than about 8 carbon atoms and is selected from the group consisting of hydrocarbyl, halohydrocarbyl, nitrohydrocarbyl, alkoxyhydrocarbyl and cyanoalkyl, R.sup.1 and R.sup.2 are the same or different and are selected from the group consisting of C.sub.1 -C.sub.8 alkyl and C.sub.1 -C.sub.8 haloalkyl, R.sup.3 is at least one divalent radical having from about 2 to 8 carbon atoms selected from the group consisting of a divalent saturated hydrocarbon, a halogen substituted divalent saturated hydrocarbon and an alkoxy substituted divalent saturated hydrocarbon, R.sup.6 is at least one radical selected from the same group as R, a is a number from 1 to 3, d is a number from 1 to 3, f is a number from 0 to 2 and the sum of a, d and f is 4.
A room temperature vulcanizable fluid composition stable under substantially anhydrous conditions and curable to an elastic solid in the presence of moisture which comprises a silanol chain-stopped polydiorganosiloxane represented by the general formula, ##EQU22## wherein R.sup.4 and R.sup.5 are each at least one radical having not more than 8 carbon atoms selected from the group consisting of hydrocarbyl, halohydrocarbyl, and cyanoalkyl which radicals may be the same or different, and n is a number from about 10 to about 15,000, and at least one silane represented by the formula, ##EQU23## wherein R is a radical having not more than about 8 carbon atoms and is selected from the group consisting of hydrocarbyl, halohydrocarbyl, nitrohydrocarbyl, alkoxyhydrocarbyl, and cyanoalkyl, R.sup.1 and R.sup.2 are the same or different and are selected from the group consisting of C.sub.1 -C.sub.8 alkyl and C.sub.1 -C.sub.8 haloalkyl, R.sup.3 is at least one divalent radical having from about 2 to 8 carbon atoms selected from the group consisting of a divalent saturated hydrocarbon, a halogen substituted divalent saturated hydrocarbon and an alkoxy substituted divalent saturated hydrocarbon, R.sup.6 is at least one radical selected from the same group as R, a is a number from 1 to 3, d is a number from 1 to 3, f is a number from 0 to 2 and the sum of a, d and f is 4.
A method of forming a room temperature vulcanizable fluid composition stable under substantially anhydrous conditions and curable to an elastic solid in the presence of moisture which comprises mixing in the substantial absence of moisture, a silanol chain-stopped polydiorganosiloxane represented by the general formula ##EQU27## wherein R.sup.4 and R.sup.5 are each at least one radical having not more than 8 carbon atoms selected from the group consisting of hydrocarbyl, halohydrocarbyl, and cyanoalkyl which radicals may be the same or different, and n is a number from about 10 to about 15,000, and at least one silane represented by the formula, ##EQU28## wherein R is a radical having not more than about 8 carbon atoms and is selected from the group consisting of hydrocarbyl, halohydrocarbyl, nitrohydrocarbyl, alkoxyhydrocarbyl, and cyanoalkyl, R.sup.1 and R.sup.2 are the same or different and are selected from the group consisting of C.sub.1 -C.sub.8 alkyl and C.sub.1 -C.sub.8 haloalkyl, R.sup.3 is at least one divalent radical having from about 2 to 8 carbon atoms selected from the group consisting of a divalent saturated hydrocarbon, a halogen substituted divalent saturated hydrocarbon and an alkoxy substituted divalent saturated hydrocarbon, R.sup.6 is at least one radical selected from the same group as R, a is a number from 1 to 3, d is a number from 1 to 3, f is a number from 0 to 2 and the sum of a, d and f is 4.
Dependencies are inferred from the claim text.