Process for altering the viscosity of organopolysiloxanes

Details Process for altering the viscosity of organopolysiloxanes Process for altering the viscosity of organopolysiloxanes

1998-11-11

2000-03-21

Dawson, Robert

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

Synthetic resins

From silicon reactant having at least one...

C08G 7708

Patent

active

060404108

ABSTRACT:
The invention relates to a process for altering the viscosity of organopolysiloxanes, wherein clay which has been treated with mineral acid and subsequently heated to from 250.degree. C. to 1200.degree. C. is used as catalyst. In the process, only small amounts of volatile siloxanes, in particular only small amounts of cyclic molecules, are formed.

REFERENCES:
patent: 2460805 (1949-02-01), Britton et al.
patent: 2866760 (1958-12-01), Haessler et al.
patent: 3903047 (1975-09-01), Ashby
patent: 4792596 (1988-12-01), Ottlinger et al.
patent: 5723561 (1998-03-01), Braun et al.
D. Tilak B. Tennakoon et al, "Characterization of Clays and Clay-Organic Systems", J. Chem. Soc., Faraday Trans. 1, 1986, 82, 545-562.
Chemical Abstracts, vol. 79: 83827e, 1973, Kolloid. Zh. 1973, Bd. 35, H. 3, sides 467-75,; FR 278,251, the preparation of polysiloxanes in presence of zeolites as catalysts is disclosed.
Derwent Abstract Corresponding to DE 44 24 001 A1, AN 96-107800.

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