Thermal stabilizer for organopolysiloxane oils
US4683319A · kind A · utility
3Cited by
6References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1986 |
| Grant date | Jul 28, 1987 |
| Priority date | — |
| Expiry date | Oct 9, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/70
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A thermal stabilizer for organopolysiloxane oils is disclosed. The stabilizer is formed by the reaction of (A) an organopolysiloxane with (B) an aromatic aminophenol in the presence of (C) a quaternary phosphonium hydroxide, or in the presence of both the quaternary phosphonium hydroxide comprising component (C) and (D) an organopolysiloxane cyclic. Organopolysiloxane oils containing said thermal stabilizer are not subject to viscosity increases or gelation in long-term heating at high temperatures. Furthermore, such combinations show very little viscosity decline in long-term heating at high temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.