Process for preparing water-soluble polymer
US4824913A · kind A · utility
6Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 6, 1987 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | May 6, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2339/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed herein is a process for preparing a water-soluble polymer, which comprises granulating a hydrous gel-like polymer obtained by polymerizing N-vinylformamide in the form of an aqueous solution of which a monomer concentration is 20 to 60% by weight, dispersing the formed polymer particles in methanol and contacting them with an aqueous solution of ammonium salt of a monovalent acid in an amount of 1 to 200% by mole based on the formamide groups in said polymer, thereby partially modifying the formamide groups in the polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.