Polydisilacyclobutasilazanes

Claim 1

A process for preparing polydisilacyclobutasilazane comprising: (I) contacting and reacting in an inert, essentially anhydrous atmosphere, a chloro-1,3-disilacyclobutane having the formula, ##STR3## where R', R", R"' and R"" are each independently selected from the group consisting of H, alkyl groups containing 1 to 4 carbon atoms, aryl groups and vinyl groups and both X' and X" are selected from the group consisting of chlorine, bromine, fluorine, alkyl groups containing 1 to 4 carbon atoms, aryl groups and vinyl groups, with a cyclic silazane or a mixture of cyclic silazanes selected from the group consisting of silazanes having the general formula (i) (CH 3 RSiNH) x and (ii) (C 6 H 5 RSiNH) x wherein each R is independently selected from the group consisting of hydrogen, alkyl radicals containing 1 to 4 carbon atoms, aryl groups, and vinyl groups, and x has a value of 3, 4, 5, or 6, at a temperature in the range of minus 50° to plus 25° C., for a time sufficient to form polydisilacyclobutasilazanes; (II) contacting the product from (I) with essentially anhydrous gaseous ammonia; (III) recovering the polydisilacyclobutasilazane from the reaction mass in (II).