Powdered cationic polyelectrolytes, based on acrylamide and quaternized or salified dimethyl-aminoethyl acrylate, process for producing them
US4319013A · kind A · utility
11Cited by
16References
9Claims
0Family size
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Key dates
| Filing date | May 12, 1978 |
| Grant date | Mar 9, 1982 |
| Priority date | — |
| Expiry date | May 12, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/923
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Cationic polyelectrolytes in water-soluble powder form, applicable to the flocculation of municipal sludge comprise copolymers of acrylamide and of quaternized or salified dimethylamino-ethyl acrylate, containing in molar proportions 10 to 50% of cationic units distributed regularly along the copolymer chains. They have an intrinsic viscosity higher than 6 and a measured cationicity higher than 90% of the theoretical cationicity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.