Hydrophobe associative polymers and compositions and methods employing them
US7056868B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 30, 2001 |
| Grant date | Jun 6, 2006 |
| Priority date | — |
| Expiry date | Apr 11, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L33/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Water soluble associative polymers and compositions comprising them together with alkali metal salts of carboxylic acid are disclosed. Methods comprise introducing into a wellbore a fluid comprising such associative polymers and alkali metal salts of carboxylic acid, e.g., cesium formate. Disclosed water soluble associative polymers have functionality including at least sulfonate groups, carboxylate groups and hydrophobes associative with one another in a saturated aqueous solution of an alkali metal salt of a carboxylic acid. Water soluble associative polymers are formed as the polymerization reaction product of reactants comprising an AMPS reactant, an alpha, beta-unsaturated carbonyl reactant and a hydrophobe reactant selected from acrylic esters, methacrylic esters and a mixture of any of them, having a —COOR moiety wherein R is a hydrophobe which, as hydrophobe moieties of the resultant associative polymer, are associative with one another in a saturated aqueous solution of an alkali metal salt of a carboxylic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.