Production of alkali-soluble, carboxyl-functional aqueous emulsion thickeners
US4801671A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1987 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | Jun 25, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F220/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
There is disclosed a method of carrying out an aqueous emulsion copolymerization to provide an alkali-soluble anionic copolymer having thickening characteristics while minimizing plating and grit problems in which the aqueous emulsion copolymerization of monoethylenically unsaturated monomers comprising from 15% to 50% by weight of carboxyl-functional monomer, at least about 10% by weight of monomer, preferably a urethane monomer, having surfactant characteristics, and the balance of the monomers being selected to provide a water insoluble copolymer, is carried out in the presence of a salt of an aromatic sulfonic acid, such as sodium styrene sulfonate, in an amount of from about 0.1% up to about 6.0%, by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.