Synthesis of organic phosphate-phosphonates
US4407765A · kind A · utility
7Cited by
2References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 21, 1981 |
| Grant date | Oct 4, 1983 |
| Priority date | — |
| Expiry date | Dec 21, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/521
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the preparation of organic phosphate-phosphonates comprises the steps of reacting an organic acylating agent with an organophosphite triester to form an intermediate followed by reacting the intermediate with an organophosphite diester. Typically benzoyl chloride is the acylating agent, triethyl phosphite and bis (.beta.-chloroethyl) phosphite the sequential reactants, and the second step is carried out in the presence of a catalytic amount of a tertiary amine. A solvent such as methylene dichloride may be employed. Organic phosphate-phosphonates are useful as flame retardants, especially in urethane foams.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.