Colorless, non-toxic, stabilized aqueous solution of a C1-C5 alkyl vinyl ether and maleic acid copolymer
US5621136A · kind A · utility
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Key dates
| Filing date | Oct 13, 1995 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | Oct 13, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2810/50
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method of stabilizing an aqueous solution of an acid copolymer of maleic acid and a C.sub.1 -C.sub.5 alkyl vinyl ether against degradation in viscosity or molecular weight upon storage for an extended period of time in aqueous solution at ambient conditions, with a single stabilizing agent, which comprises forming the acid copolymer, preferably directly from a slurry of corresponding anhydride in an organic solvent by hydrolysis in water, and adding superoxide dismutase as the single stabilizing agent to the solution either before or after hydrolysis.
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