Hydrophilic copolymers based on N-[tris(hydroxymethyl)methyl]-acrylamide, processes for their preparation, aqueous gels of said copolymers and their use as ion exchangers
US4452916A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1982 |
| Grant date | Jun 5, 1984 |
| Priority date | — |
| Expiry date | Sep 8, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F220/58
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Tridimensional cross-linked random copolymers, insoluble in water, containing in copolymerized form: (a) 25% to 98% by weight of N-[tris(hydroxymethyl)methyl]acrylamide or N-[tris(hydroxymethyl)methyl]methacrylamide, or a mixture of these two compounds. (b) 2% to 50% by weight of one or more monomers containing two or several polymerizable ethylenic double bonds and free from anionic or cationic functional groups, and (c) 0.1% to 50% by weight of one or more monomers containing a polymerizable ethylenic double bond and one or more mono- or di-substituted amino, pyrimidinyl, guanidyl, purinyl, quaternary ammonium, SO.sub.3 H or SO.sub.3 M groups, M being an alkali metal. These copolymers are utilizable, in the form of aqueous gels, as ion exchangers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.