Verfahren zur Herstellung von Silicium-Bor-Oxynitriden, dabei erhaltene Oxynitride und als Zwischenprodukte erhaltene Polyborosiloxane

摘要

The present invention provides a method for the preparation of a poly(borosiloxane). The method comprises condensing, in the presence of a catalyst, a polychlorosilane represented by the formula R 3 R 4 SiCl 2 , in which the substituents R 3 and R 4 are identical or different and represent a hydrogen atom, a chlorine atom, a linear-chain or branched alkyl, alkenyl or alkynyl group having at most 5 carbon atoms, or an aryl or aralkyl group having 6 to 18 carbon atoms, with an alkyl borate represented by the formula (R 5 O) 3 B, in which R 5 represents a linear-chain or branched alkyl group having 1 to 5 carbon atoms. The invention also provides poly(borosiloxanes) obtained by this method, a method for the preparation of boron and silicon oxynitrides which comprises effecting a nitriding pyrolysis of such poly(borosiloxanes), and boron and silicon oxynitrides obtained by this method.