Process for the preparation of siloxane-oxyalkylene copolymers
US4847398A · kind A · utility
40Cited by
6References
13Claims
0Family size
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Key dates
| Filing date | Sep 9, 1987 |
| Grant date | Jul 11, 1989 |
| Priority date | — |
| Expiry date | Sep 9, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2483/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An improved process is provided for the preparation of siloxane-oxyalkylene copolymers by a solventless process via hydrosilation of oxyethylene-rich polyethers in the presence of carboxylic acids or carboxylic acid salts as a catalyst modifier. The use of a carboxylic acid or salt prevents acetal formation through the hydroxyl groups of the polyether and/or copolymer. The use of solvent, acetal treatment and solvent stripping steps of the conventional processes are eliminated and accordingly, environmental as well as economic benefits are achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.