Use of polyacrylic acids as grinding aids for calcium carbonate
AssigneeBASF SE
InventorsKathrin Michl, Michael Gotsche, Jens Rieger, Kati Schmidt
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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.
Claims20
A method of wet milling calcium carbonate comprising
- wet milling the calcium carbonate with assistants comprising polyacrylic acids which comprise sulfur comprising organic terminal groups comprising at least two carbon atoms, have an average molecular weight Mw of from 5,000 to 30,000 g/mol and are at least partly neutralized by a base selected from the group consisting of the alkali metal hydroxides and ammonia.
Dependencies are inferred from the claim text.