Process for removing insoluable N-vinyl amide polymer from equipment
US5769959A · kind A · utility
4Cited by
6References
9Claims
0Family size
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Key dates
| Filing date | Apr 4, 1995 |
| Grant date | Jun 23, 1998 |
| Priority date | — |
| Expiry date | Apr 4, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C231/24
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Insoluble polymer formed during the distillation of N-vinylformamide is removed by contacting the insoluble polymer with an aqueous weakly basis solution in a closed system at elevated temperature. Polymer (up to 50 wt % polymer gel or 5.5 wt % dry polymer in reaction mixture) is treated with an aqueous solution of an amine, alkanolamine or weak inorganic base having a concentration of at least 1 molar. Solvents like alcohols, glycol ethers or amides may be added as a cosolvent in an amount of from 0 to about 85% by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.