C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/10, 261/41
C08G 77/62 (2006.01) C01B 33/00 (2006.01) C04B 35/14 (2006.01) C04B 35/589 (2006.01) C08G 77/60 (2006.01)
Patent
CA 2004404
Abstract HOE 88/F 343 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) Image 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, C1-C6-alkyl or C2-C6-alkenyl, R3, R4, R5, R6 and R7 = C1-C6-alkyl or C2-C6-alkenyl and where if b = 0 the reaction with R7SiHCl2, if R7 = C1-C6-alkyl and none of the other chlorosilanes is present, is to be excluded. The chlorine-containing silazane polymers according to the invention can be converted by reaction with ammonia into polysilazanes, which in their turn can be pyrolysed to form ceramic materials containing silicon nitride.
Bruck Martin
Peuckert Marcellus
Vaahs Tilo
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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