Process for the formation of hydrocarbyl bis(hydrocarbyl phosphate)
US5750756A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1996 |
| Grant date | May 12, 1998 |
| Priority date | — |
| Expiry date | Jul 29, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/093
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for forming a composition containing over, for example, about 90% by weight of an alkylene-arylene bridging group-containing bis(diphenyl phosphate) compound and less than, for example, 10%, by weight, of monophosphate by-product. This process involves the reaction of a composition containing a diphenyl halophosphate and an alkylene-arylene bridging group-containing diol, in the presence of a catalytic amount of a Lewis acid catalyst, utilizing a means, during the course of the reaction, for removal of hydrohalide by-product. The preferred means that are used for removal of hydrohalide by-product include: PA1 performing the reaction in a hydrocarbon solvent; PA1 utilizing vacuum to remove such by-product; PA1 utilizing sparging with an inert gas; and PA1 compatible combinations of one or more of the foregoing means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.