Aqueous slurry of precipitated calcium carbonate and ground calc

Details Aqueous slurry of precipitated calcium carbonate and ground calc Aqueous slurry of precipitated calcium carbonate and ground calc

1997-12-23

1999-03-09

Marcheschi, Michael

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106465, C09C 102

Patent

active

058794425

ABSTRACT:
Proposed is a method for the preparation of an aqueous slurry of calcium carbonate particles suitable as a base pigment in the preparation of a paper coating composition having excellent water retentivity and high solid concentration with good flowability, which contains precipitated and ground calcium carbonate particles in combination in a specified weight proportion and characterized by several parameters. The aqueous slurry is prepared in a process comprising the steps of: (a) subjecting an aqueous slurry or wet cake containing a specified amount of specific precipitated calcium carbonate particles to a primary dispersing treatment using a mixer to a specified extent; (b) admixing the aqueous slurry with a specified amount of specific ground calcium carbonate particles; (c) subjecting the aqueous slurry to a secondary dispersing treatment using a mixer to a specified extent; and (d) subjecting the aqueous slurry to a tertiary dispersing treatment using a sand grinder to a specified extent.

REFERENCES:
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patent: 5676747 (1997-10-01), Brown
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Chemical Abstracts, 91(1), abstract No. 9660736 (abstract of JP 54-120709) (Sep. 1979).

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