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

1991-04-17

1992-03-31

Marquis, Melvyn I.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525478, 528 37, 528 35, 528 34, 528 33, 528 31, C08G 7738

Patent

active

051009757

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,

REFERENCES:
patent: 4535007 (1985-08-01), Cannady
patent: 4847345 (1989-07-01), Takamizawa et al.
patent: 4861532 (1989-08-01), Haluska
patent: 4869854 (1989-09-01), Takeda et al.
patent: 4931513 (1990-06-01), Gerdau et al.

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