Process for producing and use of maleic acid (co-) polymer salt improved in biodegradability
US5064563A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1990 |
| Grant date | Nov 12, 1991 |
| Priority date | — |
| Expiry date | Apr 27, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F22/02
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A specially defined amount of hydrogen peroxide is used as a polymerization catalyzer; a specially defined amount and a specially defined kind of a polyvalent metal ion is used; and a specially defined amount of an alkaline substance is used, in order to polymerize a monomer component consisting essentially of only maleic acid, or a monomer component composed of maleic acid and another water-soluble ethylenically unsaturated monomer, in a specially defined proportion in water, whereby a maleic acid polymer salt, preferably a copolymer salt, of improved biodegradability is produced. The maleic acid polymer salt obtained is superior in biodegradability, has a low residual monomer content, and is useful as a detergent builder and as a scale inhibitor, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.