Methods of preparing stable condensation products and products therefrom using an alkylene oxide treatment
US3959415A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 1974 |
| Grant date | May 25, 1976 |
| Priority date | — |
| Expiry date | May 28, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2485/00
- WIPO fieldMacromolecular chemistry, polymers
- 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 condensation of these esters with an alkyl ester of a pentavalent phosphorus acid are treated after residual acidity has been neutralized with an alkylene oxide for a period of time which is sufficient to enable the alkylene oxide to act upon labile groups contained in the condensed product, i.e., cyclic, pyro and bridged groups, and to neutralize any further acidity generated by the opening of such groups. The stabilized products formed by this process when incorporated in a polyurethane foam formulation produce a foam having superior green strength to a foam containing such products which have not been treated in accordance with this invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.