Diphenyl oxide bromination process
US5210321A · kind A · utility
4Cited by
3References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1991 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | Sep 25, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C43/29
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for producing a mixture of brominated diphenyl oxides with an average bromine number of 7.0 to 7.8 is improved by the utilization of a multi-step, multi-catalyst procedure. The process uses a zirconium catalyst in the first reaction and an iron catalyst in the second reaction to yield a whiter flame retardant product having less tendency to discolor plastic resins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.