Method of temporarily inhibiting the swellability of water swellable clays and compositions
US4624982A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 5, 1985 |
| Grant date | Nov 25, 1986 |
| Priority date | — |
| Expiry date | Apr 5, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B14/104
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of temporarily inhibiting the swelling capacity of a water-swellable clay composition in contact with water includes mixing with a water-swellable clay a water soluble anionic polymer having a weight average molecular weight of about 2,000 to about 150,000 and water. The water soluble anionic polymers temporarily inhibit the swelling capacity of the water-swellable clays to decrease the viscosity of the clay slurry for transport, such as by pumping to a further treatment station such as a drier station. Also disclosed are the clay-water-anionic polymer compositions. The water soluble anionic polymers having a weight average molecular weight in the range of 2,000 to 150,000 temporarily will inhibit the swelling of a water-swellable clay so that the clay solids content of the slurry can be approximately doubled for treatment. The temporary swell-inhibiting properties of the relatively low molecular weight anionic polymers permit treatment and transportation of a clay slurry having a relatively low viscosity so that the clay solids content of the slurry can be substantially increased for primary treatment and then for transport to a secondary treatment station, such as a drie…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.