Method of preparing stable condensation products using a Lewis acid catalyst and products thereof
US4012463A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1976 |
| Grant date | Mar 15, 1977 |
| Priority date | — |
| Expiry date | Mar 11, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G79/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The neutralization of products which are phosphorus containing oligomers having ##STR1## linkages between phosphorus atoms and which are obtained by the self-condensation of .beta.-halo-alkyl esters of pentavalent phosphorus acids or by the condensation of these esters with an alkyl ester of a pentavalent phosphorus acid is accomplished by reaction with an alkylene oxide, either alone or in combination with water or an alcohol having the formula ROH where R is a C.sub.1 -C.sub.20 alkyl group, and is enhanced by heating the products with a Lewis acid to promote alcoholysis reactions between labile groups contained therein and structures formed by alkylene oxide neutralization of free acid groups. The stabilized product formed by this process gives a better cure when incorporated in a polyurethane foam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.