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)
Patent
CA 2004401
HOE 88/ F 345 Abstract of the Disclosure: Polysubstituted chlorine-containing silazane polymers, process for their preparation, ceramic materials con- taining silicon nitride which can be manufactured there- from, and their manufacture The invention relates to novel polysubstituted chlorine- containing silazane polymers, to their preparation, to their processing to form ceramic material containing silicon nitride, and to said material itself. The chlorine-containing silazane polymers are prepared by reacting oligosilazanes of formula (I) Image in which at least one of the indices a or b and at least one of the indices c or d are not equal to 0 and n is about 2 to about 12, with at least one of the chloro- silanes Cl2R6Si-CH2CH2-SiR6Cl2, Cl3Si-CH2CH2-SiR7Cl2, R8SiCl3 or R9SiHCl2 at 30°C to 300°C, where the radicals independently of one another have the following meanings: R1, R2, R4 = H, C1-C6 alkyl or C2-C6 alkenyl and R3, R5, R6, R7, R8, R9 = C1-C6 alkyl or C2-C6 alkenyl. The polysubstituted chlorine-containing silazane polymers according to the invention can be converted into poly- silazanes by reaction with ammonia, and these in turn can be pyrolyzed to form ceramic materials containing silicon nitride.
Bruck Martin
Peuckert Marcellus
Vaahs Tilo
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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