Chlorine-containing silazane polymers, process for their preparation, ceramic materials containing silicon nitride which can be prepared from them, and their preparation
CA 2004404 A1 · Owner: Bruck, Martin · Inventors: Vaahs, Tilo; Bruck, Martin; Peuckert, Marcellus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Chlorine-containing silazane polymers process for their, preparation, ceramic materials containing silicon nitride which can be prepared from them, and their preparation 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), in which a > 0 b 2 0 and n is about 2 to about 12, are reacted with at least one of the chlorosilanes Cl2R4Si-CH2-CH2-SiR4Cl2, Cl3Si-CH2-CH2-SiR5Cl2 R5SiCl3 or, R7SiHCl2 at 30°C to 300°C, where independently of one another, R1 and R2 = H …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 1, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 1, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 1, 2011.
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