Method for grinding calcium carbonate in water in the presence of a solution of acrylic polymer and an alkali carbonate salt manufactured in place in the said solution
US8841374B2 · kind B2 · utility
1Cited by
6References
13Claims
0Family size
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Key dates
| Filing date | Mar 5, 2012 |
| Grant date | Sep 23, 2014 |
| Priority date | — |
| Expiry date | Sep 7, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/40
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for manufacturing an aqueous suspension of calcium carbonate by grinding in an aqueous medium in the presence of an acrylic grinding aid agent and of an alkali carbonate salt. These salts enable the quantity of grinding aid agent used to be reduced, for an equivalent level of performance in terms of rheology and granulometry of the suspensions. The method includes a first step of manufacture of the alkali carbonate salt within the aqueous solution of acrylic polymer itself, through the addition of alkali hydroxide and bubbling of carbon dioxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.