Method of preparing stable condensation products by solvent extraction and products formed by the process
US3962374A · kind A · utility
1Cited by
3References
13Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 5, 1974 |
| Grant date | Jun 8, 1976 |
| Priority date | — |
| Expiry date | Aug 5, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2375/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Products which are phosphorus containing oligomers having ##EQU1## linkages between phosphorus atoms and which are obtained by the self-condensation of .beta.-haloalkyl esters of pentavalent phosphorus acids or by the condensation of these esters with an alkyl ester of a pentavalent phosphorus acid are extracted with an inert organic solvent. The soluble portion of said products after recovery from the solvent can be incorporated in a polyurethane foam formulation to give a foam which will have less scorching than a foam containing the original condensation product that has not been extracted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.