Chlorine-containing silazane polymers, process for their prepara

Details Chlorine-containing silazane polymers, process for their prepara Chlorine-containing silazane polymers, process for their prepara

1989-11-30

1991-07-16

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 37, 528 35, 528 34, 528 33, 525477, 525478, C08G 7712

Patent

active

050326635

ABSTRACT:
The invention relates to novel chlorine-containing silazane polymers, to their preparation, their further processing to ceramic material containing silicon nitride, and this material itself. In order to prepare the chlorine-containing silazane polymers, oligosilazanes of the formula (I) ##STR1## in which a>0, b.gtoreq.0 and n is about 2 to about 12, are reacted with at least one of the chlorosilanes Cl.sub.2 R.sup.4 Si--CH.sub.2 --CH.sub.2 --SiR.sup.4 Cl.sub.2, Cl.sub.3 Si--CH.sub.2 --CH.sub.2 --Sir.sup.5 Cl.sub.2, R.sup.6 SiCl.sub.3 or R.sup.7 SiHCl.sub.2 at 30.degree. C. to 300.degree. C., where, independently of one another,

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