Process for the preparation of polyorganosiloxanes by hydrolysis

Details Process for the preparation of polyorganosiloxanes by hydrolysis Process for the preparation of polyorganosiloxanes by hydrolysis

1997-06-11

1998-07-21

Shaver, Paul F.

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

Organic compounds

Silicon containing

556450, 556456, C07P 708

Patent

active

057837180

ABSTRACT:
The invention relates to a process for the preparation of polyorganosiloxanes by hydrolysis of organohalosilanes of formula (I) R.sub.a R.sup.1.sub.b SiX.sub.c, wherein R and R.sup.1 identical or different, are an hydrogen atom or a linear or branched C.sub.1 -C.sub.6 alkyl, aryl, alkylaryl or aralkyl group; X is a halogen atom; and a+b+c=4 and 0<c<4; said process comprising the steps of carrying out three or more successive hydrolysis steps (1), (2), (3), in which the reaction medium is capable of exerting an increasing hydrolysing force on the organohalosilanes (I), wherein step (1) is a hydrolysis under pressure in the presence of an aqueous solution S.sub.1 of saturated hydrogen halide, at the pressure and temperature of the reaction medium; and, optionally, carrying out one or more coalescence step (4).

REFERENCES:
patent: 5126470 (1992-06-01), Schulz et al.
patent: 5300669 (1994-04-01), Akamatsu et al.

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