C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/10
C08G 77/62 (2006.01) C07F 7/10 (2006.01)
Patent
CA 2004402
ABSTRACT OF THE DISCLOSURE: Polysubstituted oligosilazanes and process for their preparation The invention relates to novel polysubstituted oligo- silazanes and to a process for their preparation. The process comprises reacting excess ammonia with a starting material containing at least one of the two components (I) R1R2SiCl2 and (II) Cl2R3Si-CH2CH2-SiR3Cl2 and at least one of the two components (III) R4SiCl3 and (IV) Cl3Si-CH2CH2-SiR5Cl2, at -70 to +100°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 = C1-C6 alkyl or C2-C6 alkenyl, and the molar percentage of (I) or (II) or a mixture thereof in the starting material is 30 to 99%, and where the reaction of a mixture containing only (I) and (III) with ammonia shall be excluded. The oligosilazanes according to the invention can be converted into polymeric chlorosilazanes by means of a further reaction with chlorosilanes, and said polymeric chlorosilazanes can in turn be converted initially into polysilazanes and then into ceramic materials containing silicon nitride.
Vaahs Tilo
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
Vaahs Tilo
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