Acrylamide-derived cationic copolymers, and uses thereof
US8734616B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2010 |
| Grant date | May 27, 2014 |
| Priority date | — |
| Expiry date | Aug 3, 2030 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/18
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Cationic or amphoteric (co)polymer obtained by Hofmann degradation reaction, in aqueous solution, in the presence of an alkaline-earth and/or alkali metal hydroxide and of an alkaline-earth and/or alkali metal hypohalide, on a base (co)polymer comprising at least one nonionic monomer chosen from the group comprising acrylamide (and/or methacrylamide) and N,N-dimethylacrylamide, is characterized in that the base (co)polymer is modified beforehand with at least one polyfunctional compound containing at least 3 heteroatoms chosen from N, S, O and P and each having at least one mobile hydrogen. Use as a flocculation, retention and/or drainage aid, and dry strength aid is contemplated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.