One package, stable, moisture curable, polyalkoxy-terminated _organopolysiloxane compositions and method for making

Claim 1

A method of making a one-package and substantially acid-free room temperature vulcanizable composition curable to the solid elastomeric state, which method comprises agitating under substantially anhydrous conditions at a temperature in the range of from 0° C. to 180° C., a room temperature vulcanizable material selected from (i) a mixture comprising (a) 100 parts of a silanol-terminated polydiorganosiloxane consisting essentially of chemically combined units of the formula ##STR14## (b) a stabilizing amount of a silane scavenger for hydroxy functional groups of the formula ##STR15## (c) 0.01 to 10 parts of cross-linking silane of the formula ##STR16## (d) an effective amount of a condensation catalyst, and (e) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof; and (ii) a mixture comprising (a) 100 parts of a polyalkoxy-terminated polydiorganosiloxane of the formula ##STR17## (iii) 0 to 10 parts of a cross-linking silane of the formula, ##STR18## (iv) an effective amount of a condensation catalyst (v) a stabilizing amount of a silane scavenger for hydroxy functional groups having the formula ##STR19## and (vi) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, where R is selected from C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) alkaryl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, a is an integer equal to 1 or 2, b is a whole number equal to 0 or 1, and the sum of a+b is equal to 1 or 2, c is a whole number equal to 0 to 3 inclusive, d is an integer equal to 1 to 4 inclusive, and the sum of c+d is equal to 3 or 4, e is a whole number equal to 0 or 1 and the sum of b+e is equal to 0 to 1, n is an integer having a value of from about 50 to about 2500 inclusive, c is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive and the sum of c+f is equal to 1 to 4 inclusive, and in either mixture where X is enoxy, there is also added, before or with the scavenger, 0.1 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.

Claim 2

A method of making a one-package and substantially acid-free room temperature vulcanizable composition curable to the solid elastomeric state, which method comprises agitating under substantially anhydrous conditions at a temperature in the range of from 0° C. to 180° C., a room temperature vulcanizable material selected from (i) a mixture comprising (a) 100 parts of a silanol-terminated polydiorganosiloxane consisting essentially of chemically combined units of the formula ##STR14## (b) a stabilizing amount of a silane scavenger for hydroxy functional groups of the formula ##STR15## (c) 0.01 to 10 parts of cross-linking silane of the formula ##STR16## (d) an effective amount of a condensation catalyst, and (e) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof; and (ii) a mixture comprising (a) 100 parts of a polyalkoxy-terminated polydiorganosiloxane of the formula ##STR17## (iii) 0 to 10 parts of a cross-linking silane of the formula, ##STR18## (iv) an effective amount of a condensation catalyst (v) a stabilizing amount of a silane scavenger for hydroxy functional groups having the formula ##STR19## and (vi) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, where R is selected from C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) alkaryl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a hydrolyzable leaving group selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido radicals and, a is an integer equal to 1 or 2, b is a whole number equal to 0 or 1, and the sum of a+b is equal to 1 or 2, c is a whole number equal to 0 to 3 inclusive, d is an integer equal to 1 to 4 inclusive, and the sum of c+d is equal to 3 or 4, e is a whole number equal to 0 or 1 and the sum of b+e is equal to 0 to 1, n is an integer having a value of from about 50 to about 2500 inclusive, c is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive and the sum of c+f is equal to 1 to 4 inclusive, and in either mixture where X is enoxy, there is also added, before or with the scavenger, 0.1 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.