High temperature carborane-siloxane elastomers intermediate polymeric products and process for preparation

Claim 1

A process for the preparation of a carborane-siloxane composition comprised of at least one essentially liner carborane-siloxane polymer having the following formula: ##STR13## which process comprises the steps of: (a) contacting under an inert atmosphere a carborane disilanol of the formula: ##STR14## with a silicone compound selected from the group consisting of: (i) ureido-silanes or , ω-ureido-siloxanes of the formula: ##STR15## pr (ii) silyl carbamates or α, ω-carbamoyl-siloxanes of the formula: ##STR16## wherein: (1) R 1 and R 2 individually represent hydrogen, or groups containing up to 14 carbon atoms and selected from the group consisting of alkyl, alkenyl, cycloalkyl, aryl, alkaryl, aralkyl, alkoxy, alkoxyaryl, cyanoalkyl, morpholinyl, and pyridinyl; (2) R 3 individually represents hydrogen or a group containing up to 14 carbon atoms and selected from the group consisting of alkyl, alkenyl, cycloalkyl, alkaryl, aralkyl, alkoxyaryl, haloaryl, cyanoalkyl, morpholinyl and pyridinyl; and wherein 2 R 3 s, can when taken together contain up to 6 carbon atoms and represent alkylene, dialkylene amine or alkyl-substituted dialkylene amine; (3) R 4 and R 5 individually represent hydrogen or groups containing up to 14 carbon atoms and selected from the group consisting of alkyl, alkenyl, aryl, alkaryl, alkoxy and alkoxyalkyl, (4) X represents a divalent radical derived from 1,7-decacarborane, 1,12 -decacarborane, 1,10-octacarborane, 1,6-octacarborane, 2,4-pentacarborane, 1,6-tatracarborane, 9-alkyl-1,7-decacarborane, 9,10-dialkyl-1,7-decacarborane, 2-alkyl-1,12-decacarborane, 2-alkyl-1,10-octacarborane, 8-alkyl-1,6-octacarborane, decachloro-1,7decacarbornae, decachloro-1,12-decacarborane, octachloro-1,10-octacarborane, decafluoro-1,7-decacarborane, decafluoro-1,12- decacarborane, octafluoro-1,10-octacarborane, or mixtures thereof, (5) m and N individually have a value of from 0 to 4 and l has a value such that the molecular weight of the polymer is up to about 150,000 and higher; and (b) recovering said carborane-siloxane polymer.