Process for the preparation of polysilazanes

Details Process for the preparation of polysilazanes Process for the preparation of polysilazanes

1993-04-26

1993-12-07

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

528 21, 528 28, 528 31, 528 33, C07F 710, C08G 7706, C08G 7704, C08G 7712

Patent

active

052684962

ABSTRACT:
The invention relates to a process for preparing polysilazanes, which comprises (a) reacting a disilane of the general formula Me.sub.6-n Si.sub.2 Cl.sub.n in which n is 3 or 4, with an amine of the general formula RNH.sub.2, in which R represents an alkyl or aryl radical, in an inert atmosphere at temperatures in the range of from -80.degree. C. to 100.degree. C., (b) reacting the reaction product from (a) with a dicholorosilane of the general formula R'.sub.2 SiCl.sub.2, in which the radical R', is the same or different and represents a hydrogen atom, an alkyl, allyl or aryl radical, or tetramethyldichlorodisilane in an inert atmosphere at temperatures in the range of from -20.degree. C. to 150.degree. C. and (c) reacting the reaction product from (b) with ammonia in an inert atmosphere and thereafter separating off the ammonium chloride thus formed.

REFERENCES:
patent: 3393218 (1968-07-01), Van Wazer et al.
patent: 3467686 (1969-09-01), Creamer
patent: 3809713 (1974-05-01), Boersma et al.
patent: 4482669 (1984-11-01), Seyferth et al.
patent: 4745205 (1988-05-01), Haluska
patent: 4778907 (1988-10-01), Gallo
patent: 4992523 (1991-02-01), Bacque et al.
patent: 5008423 (1991-04-01), Gerdau et al.

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