Acrylamide containing emulsion copolymers for thickening purposes
US4423199A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1982 |
| Grant date | Dec 27, 1983 |
| Priority date | — |
| Expiry date | Sep 30, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L33/26
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
There are disclosed stable, aqueous dispersions of water-insoluble emulsion copolymers of (1) about 10-70% by weight of methacrylic or acrylic acid, (2) about 0.5-25% by weight of an N-alkyl acrylamide, and (3) at least 25% by weight, to a total of 100%, of a C.sub.1 -C.sub.4 alkyl (meth)acrylate, and, optionally, included in the total monomer mixture a small amount of (4) about 0.05-1% by weight of a polyethylenically unsaturated monomer. The emulsion copolymers, when neutralized and solubilized by addition of an alkali, are high efficiency thickeners for aqueous systems and have improved tolerance to ionic or electrolyte content. Typical systems that can be thickened are paint latices, cosmetic preparations, food preparations, ionic detergents, dye pastes for textiles, pharmaceuticals, and oil well drilling muds. Surfactants enhance the thickening properties afforded by the copolymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.