Process for preparing low-acid-value phosphoric esters
US6403820B1 · kind B1 · utility
1Cited by
1References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 8, 2001 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Feb 8, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The process for producing a low acid value phosphoric ester of the present invention is characterized by comprising treating a phosphoric ester having an acid value with an organic ortho-acid ester. The phosphoric ester preferably has a specific structure. The organic ortho-acid ester is preferably an ester of orthoformic acid, orthoacetic acid or orthopropionic acid with an alkyl group having 1 to 4 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.