(4-Hydroxy-alkylphenyl diphenyl phosphate flame rerardants
US5817857A · kind A · utility
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Key dates
| Filing date | Jun 20, 1997 |
| Grant date | Oct 6, 1998 |
| Priority date | — |
| Expiry date | Jun 20, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention is a process for forming monohydroxy-terminated aromatic oligomeric phosphates by the reaction of a diaryl halophosphate, such as diphenyl chlorophosphate, optionally in the presence of some monoaryl dihalophosphate, with an aromatic diol, such as resorcinol, to form the monohydroxy-terminated aromatic oligomeric phosphate. The reaction preferably employs a Lewis acid catalyst, such as magnesium dichloride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.