Freeze-thaw stable polyacrylamide emulsions
US5200448A · kind A · utility
11Cited by
1References
12Claims
0Family size
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Key dates
| Filing date | Mar 27, 1992 |
| Grant date | Apr 6, 1993 |
| Priority date | — |
| Expiry date | Mar 27, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L35/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Water-in oil emulsions of water-soluble polymers, i.e. polyacrylamides, are stabilized against repeated freeze-thaw cycles by incorporating specific polymeric surfactants while maintaining the total amount of the primary surfactant at less than about 2 percent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.