Process for preparing acrylamide copolymers by Hofmann degradation reaction
US8623966B2 · kind B2 · utility
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2References
20Claims
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Key dates
| Filing date | Mar 18, 2009 |
| Grant date | Jan 7, 2014 |
| Priority date | — |
| Expiry date | Aug 23, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
In a process for preparing cationic or amphoteric (co)polymers derived from acrylamide by a Hofmann degradation reaction in aqueous solution in the presence of an alkali and/or alkaline-earth metal hydroxide and an alkali metal hypohalide on a base copolymer, a solution of base copolymer on which the reaction is performed contains a polyvalent cationic salt representing at least 0.5% by weight, preferably from 2 to 10% by weight of the base copolymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.