Hydrophobically associating terpolymers of acrylamide, salts of acrylic acid and alkyl acrylamide
US4694046A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1985 |
| Grant date | Sep 15, 1987 |
| Priority date | — |
| Expiry date | Nov 25, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Novel water soluble terpolymers of acrylamide, an alkali metal or ammonium salt of acrylic acid and an oil soluble or hydrophobic alkyl acrylamide monomer have been found to provide efficient viscosification of water or brine solutions. The polymers are prepared by a free radical micellar polymerization of acrylamide and alkyl acrylamide followed by base catalyzed partial hydrolysis. These terpolymers, called HRAM, impart unique and useful rheological properties to aqueous solutions. In a water or brine solution the hydrophobic groups associate to increase hydrodynamic size and enhance thickening efficiency. Solutions containing the HRAM terpolymers show increased viscosification at higher polymer concentration and reduced salt sensitivity relative to polyacrylamide based HPAM solutions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.