Cationic copolymers derived from acrylamides and use thereof
US8242215B2 · kind B2 · utility
4Cited by
1References
23Claims
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Key dates
| Filing date | Feb 19, 2008 |
| Grant date | Aug 14, 2012 |
| Priority date | — |
| Expiry date | Oct 28, 2028 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/18
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A cationic copolymers of acrylamide obtained by the Hofmann rearrangement, using an alkali and/or alkaline earth hydroxide and an alkali and/or alkaline earth hypohalide, are provided. The copolymers can be used as strengthening agents for paper and/or coagulants. The copolymers have a desalination coefficient (Cd) higher than 0.6, higher than 0.65, or higher than 0.7.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.