Process for preparing linear organopolysiloxanes having Si-H...

Details Process for preparing linear organopolysiloxanes having Si-H... Process for preparing linear organopolysiloxanes having Si-H...

2008-07-08

2008-07-08

Gulakowski, Randy (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

Reexamination Certificate

active

07396894

ABSTRACT:
The invention provides a process for preparing linear organopolysiloxanes (P) having diorganosiloxy units and Si—H groups, in which, in a first step, diorganodichlorosilanes (A) and monochlorosilanes (B) and optionally dichlorosilanes (C), at least one of the monochlorosilanes (B) or dichlorosilanes (C) containing Si—H groups, are reacted with at most 0.5 mol of water per mole of hydrolyzable chlorine to give a partial hydrolyzate (T) and gaseous hydrogen chloride, and, in a second step, the SiCl groups still present in the partial hydrolyzate (T) are removed by treating with water to form hydrochloric acid, and a hydrolyzate (H) containing the organopolysiloxanes (P) is obtained.

REFERENCES:
patent: 5919883 (1999-07-01), Dittrich et al.
patent: 6143912 (2000-11-01), Lindner et al.
patent: 6232423 (2001-05-01), Koehler et al.
patent: 6727303 (2004-04-01), Ono et al.
patent: 0 967 236 (1999-12-01), None
patent: 0 967 236 (1999-12-01), None
patent: 1 247 811 (2002-10-01), None
patent: WO 96/18670 (1996-06-01), None
Derwent Abstract corresponding to EP 967 236 [AN 2000-089092].
Derwent Abstract corresponding to WO 96/18670 [AN 1996-278811].

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