Freeze-thaw stable polyacrylamide emulsions
US4845138A · kind A · utility
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3References
13Claims
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Key dates
| Filing date | Apr 15, 1988 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Apr 15, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/1539
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Water-in-oil emulsions of water-soluble polymers, i.e. polyacrylamides, which are subject to freeze-thaw degradation are stabilized against repeated freeze-thaw cycles by incorporating specific substituted succinic anhydrides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.