Patent · US Expired

Use of polyacrylic acids as grinding aids for calcium carbonate

US7297205B2 · kind B2 · utility

3Cited by

14References

20Claims

0Family size

Assignee

BASF SE

Inventors

Kathrin Michl · Ludwigshafen, DE
Michael Gotsche · Aachen, DE
Jens Rieger · Forchheim, DE
Kati Schmidt · Shanghai, CN

Key dates

Filing date	Mar 5, 2004
Grant date	Nov 20, 2007
Priority date	—
Expiry date	Apr 20, 2024

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S423/15
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

The invention relates to the use of polyacrylic acids which contain organic terminal groups containing sulphur, comprising at least two carbon atoms, having an average molecular weight Mw of 5 000-30 000 g/mol and which are at least partially neutralized by a base which is selected from the group of alkali hydroxides and ammonia as auxiliary agents for wet grinding of calcium carbonate. The invention also relates to fine particle aqueous suspensions of calcium carbonate which are produced by wet grinding of calcium carbonate in the presence of said polyacrylic acids.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.