Process for thickening with copolymers of alkyl poly (oxyalkylene) itaconic di-esters
US4663385A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1982 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | Nov 17, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L33/02
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
There is disclosed a process of thickening an aqueous system comprising adding to the system aqueous dispersions of water-insoluble emulsion copolymers of (1) about 10-70% by weight of (meth)acrylic acid or itaconic acid, (2) about 0.5-25% by weight of an alkyl poly(oxyethylene) itaconate, 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 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.