Process for the production of polymeric polyols
US5292803A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1992 |
| Grant date | Mar 8, 1994 |
| Priority date | — |
| Expiry date | Oct 6, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
There is disclosed a process for the production of polymeric polyols, which comprises the steps of: PA0 partially or completely saponifying a heterogeous two-phase mixture of (a) a heated molten liquid containing an ethylene-saturated carboxylic acid vinyl ester copolymer having a number average molecular weight of from 800 to 5000 and a saturated carboxylic acid vinyl ester content of from 1 to 50% by weight, and (b) an aliphatic alcohol, in the presence of an alkali catalyst, while removing a saturated carboxylic acid alkyl ester byproduct from the reaction system; PA0 then removing the residual aliphatic alcohol from the reaction system; and PA0 supplying an alkylene oxide to effect an alkylene oxide-addition reaction, optionally after further supplying the alkali catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.