Silicone macromers and thermoplastic flame retardant silicone-polyphenylene ether graft copolymers obtained therefrom
US5204438A · kind A · utility
39Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1992 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Jan 15, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2201/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A silicone cyclic, such as hexaorganotrisiloxane is lithiated with an alkyl lithium compound followed by treatment with a diorganohalosilane to produce a polydiorganosiloxane having a terminal diorganohydridesiloxy unit. The platinum catalyzed addition of a 2-alkenyl-6-organophenol results in the production of a phenol-siloxane macromer. Conversion of the phenol-siloxane macromer to a silicone polyphenylene ether graft copolymer is effected by oxidatively coupling the 2,6-diorganophenol to the phenol-siloxane macromer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.