Crosslinked, non-swellable ampholytic base resins
US6420439B1 · kind B1 · utility
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13References
16Claims
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Key dates
| Filing date | Apr 15, 1999 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Apr 15, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2220/52
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Described are non-swelling, crosslinked, bead forms of ampholytic base polymers that can be utilized in the chromatographic-type separation of acids from other compounds. Preferred polymers are prepared by modifying a poly-2 or poly-4-vinylpyridine resin crosslinked with divinylbenzene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.