Process for removing residual monomers and oligemers from amine-containing polymers
US5055197A · kind A · utility
51Cited by
1References
11Claims
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Key dates
| Filing date | Apr 5, 1991 |
| Grant date | Oct 8, 1991 |
| Priority date | — |
| Expiry date | Apr 5, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F6/001
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Treatment of water-soluble, amine-containing polymers with strong acid, cation exchange resins from aromatic copolymer crosslinked with 2-25% polyvinyl crosslinker, followed by ultrafiltration with a membrane filter having a molecular-weight cutoff, measured against the polymers to be treated, of about 10,000 to about 15,000, results in a highly effective removal of residual monomers and oligomers of less than 500 molecular weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.