Process for the preparation of organopolysiloxanes

Details Process for the preparation of organopolysiloxanes Process for the preparation of organopolysiloxanes

2006-09-27

2010-06-15

Price, Elvis O (Department: 1621)

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

Organic compounds

Silicon containing

C556S440000, C556S455000, C568S869000, C528S020000

Reexamination Certificate

active

07737292

ABSTRACT:
A continuous process for the preparation of organopolysiloxanes involves, in a first step, reacting chlorosilanes with from 0.01 to 0.7 mol of water per mole of hydrolyzable chlorine and with from 0.2 to 1.7 mol of alcohol per mole of hydrolyzable chlorine, the molar ratio of water to alcohol being from 0.005 to 3.5; in a second step, the reaction mixture obtained in the first step is optionally mixed continuously with a water-insoluble organic solvent having a density of less than 0.9 kg/l, and water is metered in continuously in amounts of from 0.2 to 100 mol of water per mole of silicon component; and in a third step, the aqueous alcoholic phase is separated off.

REFERENCES:
patent: 2398672 (1946-04-01), Sauer
patent: 2470497 (1949-05-01), Lamoreaux
patent: 6069220 (2000-05-01), Hoffmann et al.
patent: 6107505 (2000-08-01), Yoshida et al.
patent: 32 02 558 (1983-08-01), None
patent: 228 550 (1985-10-01), None
patent: 198 00 023 (1999-07-01), None
Loose translation of the abstract belonging to DE 228 550 A1 (front page, point 57).
U.S. 6,069,220 is corresponding to DE 198 00 023 A1.
Patbase Asbstrace corresponding to DE 32 02 558 A1.

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