Preparation of branched tetrasiloxane
US6875881B2 · kind B2 · utility
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Key dates
| Filing date | May 27, 2004 |
| Grant date | Apr 5, 2005 |
| Priority date | — |
| Expiry date | May 27, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F7/0874
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.