Process for preparing high-purity vinylpyrrolidone polymer
US6486281B1 · kind B1 · utility
4Cited by
3References
8Claims
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Key dates
| Filing date | Aug 24, 2001 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Aug 24, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F6/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing a high purity vinylpyrrolidone polymer which dissolves clearly in an organic solvent can be provided. The process for preparing a high purity vinylpyrrolidone polymer, wherein vinylpyrrolidone is polymerized by using a redox initiator comprising an organic peroxide and a sulfite, and thereafter the product is contacted with an anion exchange resin to be purified.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.