Calcium carbonate slurries

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United States of America Patent

PATENT NO 9074067
APP PUB NO 20140345496A1
SERIAL NO

14367903

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A process is provided for making a calcium carbonate slurry comprising the steps of (a) forming a mixture comprising water, an acidic dispersant system, and calcium carbonate, (b) grinding said mixture to form a preliminary slurry of particles of said calcium carbonate, wherein 50% or more by weight of said calcium carbonate in said preliminary slurry, based on the total weight of said calcium carbonate in said preliminary slurry, is in the form of particles having diameter of 2 micrometers or less, and wherein the pH of said preliminary slurry is 9.0 or below, and (c) after step (b), adding one or more organic neutralizing agent to bring the pH of said preliminary slurry to 9.4 or above.

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Patent Owner(s)

  • ROHM AND HAAS COMPANY

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Dufour, Alain Valbonne, FR 7 139

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