Room temperature vulcanizable organopolysiloxane compositions and method for making

Claim 1

Room temperature vulcanizable compositions comprising by weight, (A) 100 parts of organopolysiloxane consisting essentially of chemically combined diorganosiloxy and terminated with polyalkoxy siloxy units, (B) 0 to 10 parts of a polyalkoxy silane of the formula ##STR9## (C) 0 to 5 parts of amine accelerator, (D) an effective amount of a tin condensation catalyst of the formula ##STR10## (E) 0 to 5 parts of a β-diketone of the formula ##STR11## (F) 0 to 700 parts of filler, where R is selected from C.sub.(1-18) monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals, and R 1 , R 2 and R 3 are the same or different monovalent radials selected from the class consisting of hydrogen, R, --Si(R) 3 , acyl and nitrile R 5 is a monovalent radical selected from C.sub.(1-13) hydrocarbon radicals and substituted C.sub.(1-13) hydrocarbon radicals, R 6 is a C.sub.(1-8) aliphatic organic radical selected from alkyl radicals, alkylether radicals, alkyl ester radicals, alkylketone radicals and alkylcyano or a C.sub.(7-13) aralkyl radical and a is a whole number equal to 0 or 1.

Claim 15

A method for making room temperature vulcanizable organopolysiloxane compositions which comprises mixing together under substantially anhydrous conditions a mixture comprising by weight, (i) 100 parts of alkoxy terminated organopolysiloxane, (ii) 0 to 10 parts of polyalkoxy silane, of the formula ##STR14## (iii) 0 to 5 parts of amine accelerator, (iv) an effective amount of tin condensation catalyst of the formula ##STR15## (v) 0 to 5 parts of a β-diketone of the formula ##STR16## (vi) 0 to 700 parts of filler, where R is selected from C.sub.(1-18) monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals, and R 1 , R 2 and R 3 are the same or different monovalent radicals selected from the class consisting of hydrogen, R, Si(R) 3 , acyl and nitrile.

Claim 16

A method for making room temperature vulcanizable organopolysiloxane compositions which comprises mixing together under substantially anhydrous conditions a mixture comprising by weight, (i) 100 parts of alkoxy terminated organopolysiloxane, (ii) 0 to 10 parts of polyalkoxy silane, of the formula ##STR14## (iii) 0 to 5 parts of amine accelerator, (iv) an effective amount of tin condensation catalyst of the formula ##STR15## (v) 0 to 5 parts of a β-diketone of the formula ##STR16## (vi) 0 to 700 parts of filler, where R is selected from C.sub.(1-18) monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals, and R 1 , R 2 and R 3 are the same or different monovalent radicals selected from the class consisting of hydrogen, R, Si(R) 3 , acyl and nitrile.

Claim 17

A method for making a room temperature vulcanizable organopolysiloxane composition which comprises, (1) mixing together under substantially anhydrous conditions a mixture comprising by weight, (i) 100 parts of silanol terminated polydiorganosiloxane, (ii) 0.1 to 10 parts of polyalkoxy silane, (iii) 0 to 5 parts of amine accelerator, and (iv) 0 to 700 parts of filler, (v) 0 to 5 parts, per 100 parts of the alkoxy terminated polydiorganosiloxane, of a β-diketone of the formula ##STR17## (2) allowing the mixture of (1) to equilibrate to produce polyalkoxy terminated polydiorganosiloxane, and (3) further agitating the mixture of (2) under substantially anhydrous conditions and thereafter adding an effective amount of a tin condensation catalyst of the formula, ##STR18## where R is selected from C.sub.(1-18) monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals, and R 1 , R 2 and R 3 are the same or different monovalent radicals selected from the class consisting of hydrogen, R, Si(R) 3 , acyl and nitrile.

Claim 18

A method for making a room temperature vulcanizable organopolysiloxane composition which comprises, (1) mixing together under substantially anhydrous conditions a mixture comprising by weight, (i) 100 parts of silanol terminated polydiorganosiloxane, (ii) 0.1 to 10 parts of polyalkoxy silane, (iii) 0 to 5 parts of amine accelerator, and (iv) 0 to 700 parts of filler, (v) 0 to 5 parts, per 100 parts of the alkoxy terminated polydiorganosiloxane, of a β-diketone of the formula ##STR17## (2) allowing the mixture of (1) to equilibrate to produce polyalkoxy terminated polydiorganosiloxane, and (3) further agitating the mixture of (2) under substantially anhydrous conditions and thereafter adding an effective amount of a tin condensation catalyst of the formula, ##STR18## where R is selected from C.sub.(1-18) monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals, and R 1 , R 2 and R 3 are the same or different monovalent radicals selected from the class consisting of hydrogen, R, Si(R) 3 , acyl and nitrile.