Preparation of branched siloxane

Details Preparation of branched siloxane Preparation of branched siloxane

2005-09-13

2005-09-13

Barts, Samuel (Department: 1621)

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

Organic compounds

Silicon containing

C556S453000, C556S455000, C556S456000

Reexamination Certificate

active

06943264

ABSTRACT:
By reacting a branched siloxane compound of formula (2) containing compounds of formula (1) as an impurity with a disiloxane compound of formula (3) in the presence of an acid compound, there is prepared a branched siloxane of formula (2) containing a reduced level of compounds of formula (1).in-line-formulae description="In-line Formulae" end="lead"?R1nSi(OSiR23)3-n(OR3)  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?R1nSi(OSiR23)4-n  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?R23SiOSiR23  (3)in-line-formulae description="In-line Formulae" end="tail"?R1is a monovalent hydrocarbon group, R2and R3are H or monovalent hydrocarbon groups, and n is 0 or 1.

REFERENCES:
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Ohkawa, XP002309579, Database CA, Chemical Abstracts Service, Columbus, Ohio, “Preparation of Silicones Having a Siloxy-Group”, database accession No. 131:144711 (Aug. 1999).
Voronkov et al.; “Cleavage of the SiOSi grouping by Tetrachlorosilane and Organylchlorosilanes,” Doklady Akademii Nauk SSSR, vol. 227, No. 2, pp. 362-365 (1976).
Hasegawa et al.; “Treatment of alkyltriethoxysilanes with Amberlyst 15 cation-exchange resin in the presence of hexamethyldisiloxane,” Journal of Organometallic Chemistry, vol. 340 pp. 31-36 (1988).

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