Method of producing a modified smectite or smectite-containing substance capable of taking up and releasing water in a reversible manner
US8846796B2 · kind B2 · utility
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5References
15Claims
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Key dates
| Filing date | Apr 22, 2008 |
| Grant date | Sep 30, 2014 |
| Priority date | — |
| Expiry date | Apr 22, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D31/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for producing a modified smectite or smectite-containing substance including treating a non-activated smectite or substance with a water soluble activating agent and polymer in a two stage process, the first stage including adding 0-3.0% of the activating agent and 0.05-1.0% of the polymer, by weight, and in a second stage adding 0-5.0% of the activating agent 0.3-5% of the polymer, by weight, to the mixture of the first stage, wherein at least a part of the polymer is added as a dry solid and the water in the first stage is at least 20% by weight and at most 50% by weight in the second stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.