Silazane polymers containing SiCl groups, process for their prep

Details Silazane polymers containing SiCl groups, process for their prep Silazane polymers containing SiCl groups, process for their prep

1991-01-24

1993-02-16

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 34, 528 38, 556410, 501 92, C08G 7726

Patent

active

051872528

ABSTRACT:
The invention relates to novel silazane polymers containing SiCl groups, to their preparation, to their conversion into silicon nitride-containing ceramic material, and to this material itself. In order to prepare the silazane polymers containing SiCl groups, .alpha.,.omega.-chlorosilazanes of the formula I ##STR1## in which m has a value of from 1 to 12 and --(Si) is a silyl radical of the formula --SiHR.sup.1 Cl, --SiR.sup.2 R.sup.3 Cl, --SiR.sup.4 Cl.sub.2, --SiR.sup.5 Cl-CH.sub.2 CH.sub.2 -SiR.sup.5 Cl.sub.2 or --SiCl.sub.2 -CH.sub.2 CH.sub.2 -SiR.sup.6 Cl.sub.2, and R is C.sub.1 -C.sub.6 -alkyl or C.sub.2 -C.sub.6 -alkenyl and, independently of one another, R.sup.1 -R.sup.6 are H, C.sub.1 -C.sub.6 -alkyl or C.sub.2 -C.sub.6 -alkenyl, to a temperature of from 100.degree. C. to 400.degree. C.
The silazane polymers according to the invention containing in SiCl groups can be reacted with ammonia to give polysilazanes, which can themselves be pyrolyzed to give silicon nitride-containing ceramic materials.

REFERENCES:
patent: 4397828 (1983-08-01), Seyferth et al.
patent: 4482669 (1984-11-01), Seyferth et al.
patent: 4543344 (1985-09-01), Cannady
patent: 4595775 (1986-06-01), Arkles
patent: 4992523 (1991-02-01), Bacque et al.
patent: 5032663 (1991-07-01), Vaahs et al.
Wills, R. R., et al., Ceramic Bulletin 62:904-915, vol. 8 (1983).

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