Process for purifying phosphoric esters
US5616768A · kind A · utility
7Cited by
1References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1995 |
| Grant date | Apr 1, 1997 |
| Priority date | — |
| Expiry date | Jun 19, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/025
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for purifying a phosphoric ester, which comprises treating a crude phosphoric ester with an epoxy compound, heating the resultant in the presence of water, washing the resultant with water, and removing the residual water. The obtained phosphoric esters have low acid value and are excellent in physical properties such as heat resistance, resistance to hydrolysis and storage stability, and are useful as plasticizers and/or flame-retardants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.