Preparation of branched tetrasiloxane

Details Preparation of branched tetrasiloxane Preparation of branched tetrasiloxane

2005-04-05

2005-04-05

Barts, Samuel (Department: 1621)

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

Organic compounds

Silicon containing

C556S451000, C556S453000, C556S462000

Reexamination Certificate

active

06875881

ABSTRACT:
A branched tetrasiloxane is prepared by preforming a liquid mixture of a disiloxane compound, an alcohol and an acid catalyst, adding a trialkoxysilane compound to the mixture for reaction, and adding water to the reaction mixture for co-hydrolysis, thereby forming a branched tetrasiloxane. The method is capable of preparing a branched tetrasiloxane, especially methyltris(trimethylsiloxy)silane having a sufficiently high purity to use as cosmetic oil in good yields.

REFERENCES:
patent: 1 213 006 (2002-06-01), None
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patent: 200115658 (2001-03-01), None
M. G. Voronkov et al.; “Cleavage of the SiOSi Grouping by Tetrachlorosilane and Organylchlorosilanes”; Doklady Akademii Nauk SSSR, vol. 227, (1976) No. 2, pp. 362-265.
Isao Hasegawa et al.; “Treatment of alkyltriethoxysilances with Amberlyst 15 cation-exchange resin in the presence of hexamethyloxane”; Journal of Organometallic Chemistry, vol. 340 (1988) pp. 31-36.

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