C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
267/1, 260/446.3
C07F 7/10 (2006.01) C04B 35/58 (2006.01) C04B 35/589 (2006.01) C04B 35/64 (2006.01) C08G 77/60 (2006.01) C08G 77/62 (2006.01)
Patent
CA 2034954
HOE 90/F 030 Abstract of the Disclosure Silazane polymers containing SiCl groups, process for their preparation, silicon nitride-containing ceramic materials which can be prepared from them, and their preparation 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 Image (I) in which m has a value of from 1 to 12 and -(Si) is a silyl radical of the formula -SiHR1Cl, -SiR2R3Cl, -SiR4Cl2, -SiR5Cl-CH2CH2-SiR5Cl2 or -SiCl2-CH2CH2-SiR6Cl2, and R is C1-C6-alkyl or C2-C6-alkenyl and, independently of one another, R1-R6 are H, C1-C6-alkyl or C2-C6-alkenyl, to a temperature of from 100°C to 400°C. The silazane polymers according to the invention con- taining in SiCl groups can be reacted with ammonia to give polysilazanes, which can themselves be pyrolyzed to give silicon nitride-containing ceramic materials.
Bruck Martin
Kleiner Hans-Jerg
Vaahs Tilo
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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