Method of preparing phosphonium siloxanes and products thereof
US4008261A · kind A · utility
8Cited by
8References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1975 |
| Grant date | Feb 15, 1977 |
| Priority date | — |
| Expiry date | Jan 2, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/38
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Phosphorus-containing catalysts that are suitable for polymerizing polyorganosiloxanes are prepared from tetraorgano phosphonium halides, a basic compound, such as sodium hydroxide, and an organosilicon compound. The catalyst must be prepared at a temperature of at least 30.degree. C. The catalysts are moisture sensitive but possess improved shelf-life stability. They are used to polymerize polyorganosiloxanes and can subsequently be inactivated by heating to a temperature above approximately 130.degree. C. for a suitable length of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.