Water-soluble post branched cationic acrylamide polymers and use thereof
US8597467B2 · kind B2 · utility
1Cited by
3References
15Claims
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Key dates
| Filing date | Jul 11, 2008 |
| Grant date | Dec 3, 2013 |
| Priority date | — |
| Expiry date | Mar 13, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2800/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A cationic copolymer is obtained by the Hofmann rearrangement (also referred to as the Hofmann degradation reaction) in aqueous solution in the presence of an alkaline-earth and/or alkali hydroxide and an alkaline-earth and/or alkaline hypohalide, on a base copolymer comprising at least one nonionic monomer selected from the group comprising acrylamide (and/or methacrylamide), N,N-dimethylacrylamide and/or acrylonitrile The copolymer is branched after the Hofmann rearrangement, in the presence of at least one polyfunctional branching agent, and is soluble in water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.