Process for hydrolyzing water-soluble carboxamide polymers
US4151140A · kind A · utility
3Cited by
6References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1977 |
| Grant date | Apr 24, 1979 |
| Priority date | — |
| Expiry date | Nov 2, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2800/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A stable, water-in-oil emulsion of a partially hydrolyzed carboxamide polymer is prepared by contacting a water-in-oil emulsion of an inherently water-dispersible polymer containing carboxamide groups, e.g., polyacrylamide, with a water-in-oil emulsion of a hydrolyzing agent such as sodium hydroxide. By emulsifying the hydrolyzing agent prior to hydrolysis, the hydrolysis reaction can be carried out over a wider range of reaction conditions such as temperature and the like without destroying the water-in-oil emulsion of the polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.