Silica-coated alkaline earth metal carbonate pigment

Details Silica-coated alkaline earth metal carbonate pigment Silica-coated alkaline earth metal carbonate pigment

1998-10-29

2000-10-24

Green, Anthony

Compositions: coating or plastic

Materials or ingredients

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

106465, 106482, 423430, 428404, C09C 102

Patent

active

061360856

ABSTRACT:
A method for forming a silica coating on at least a portion of the surface of alkaline earth metal carbonate particulates in aqueous suspension and the silica-coated alkaline earth metal carbonate so produced are claimed. The claimed method consists of allowing soluble silicate ions in the aqueous phase to slowly react with the alkaline earth metal carbonate surface to form silica micro-particulates on the surface. This silica coating confers upon the composition unique properties among which are pronounced thixotropic behavior when incorporated into an aqueous suspension and increased oil absorption when dry. The pigment produced by this method is especially suited for use as a filler in paper.

REFERENCES:
patent: 4167423 (1979-09-01), Williams
patent: 4374178 (1983-02-01), Kulkarni et al.
patent: 5000791 (1991-03-01), Tokarz et al.
patent: 5037477 (1991-08-01), Tokarz et al.
patent: 5164006 (1992-11-01), Chapnerkar et al.

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