publication_number US 4496705 A abstract a method is provided for producing aminoalkyl siloxane polymers of a high molecular weight by hydrolyzing a difunctional aminoalkyl silane prior to incorporation into the siloxane polymer the high molecular weight siloxane polymers obtained may be converted to zwitterionic siloxane rubbers with excellent engineering properties and integrity application_number US 56801884 A description the objects of the invention and other objects are accomplished by hydrolyzing a difunctional aminoalkyl silane of the formula str3 wherein each r b is a monovalent hydrocarbon radical independently selected from the group consisting of alkyl radicals of from 1 to 20 carbon atoms and aryl radicals of from 6 to 20 carbon atoms r a is an aminoalkyl radical of the general formula wherein r 1 and r 2 are divalent hydrocarbon radicals selected from the group consisting of alkylene radicals of from 1 to 10 carbon atoms and divalent aryl radicals of from 6 to 20 carbon atoms and n is an integer of from 0 to 5 inclusive and r c is a monovalent radical selected from the group consisting of hydrogen alkyl radicals of from 1 to 20 carbon atoms aryl radicals of from 6 to 20 carbon atoms and the aminoalkyl radicals within the scope of r a the preferred difunctional aminoalkyl silanes are those wherein each r b is a methyl radical examples of such aminoalkyl silanes include n aminoethyl u03b3 aminopropylmethyldimethoxysilane n aminoethyl u03b3 aminopropylethyldimethoxysilane n aminoethyl u03b3 aminopropylpropyldimethoxysilane n aminoethyl u03b3 aminopropylbutyldimethoxysilane aminopropylmethyldimethoxysilane aminopropylethyldimethoxysilane aminopropylbutyldimethoxysilane aminopropylphenyldimethoxysilane n aminoethyl u03b3 aminopropylphenyldimethoxysilane aminoethylmethyldimethoxysilane.