Method for preparing acid resistant calcium carbonate pigments

Details Method for preparing acid resistant calcium carbonate pigments Method for preparing acid resistant calcium carbonate pigments

1991-04-08

1992-11-17

Dixon, Jr., William R.

Compositions: coating or plastic

Materials or ingredients

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

106431, 106471, 106481, C09C 102

Patent

active

051640066

ABSTRACT:
A method for preparing an acid resistant calcium carbonate pigment. An aqueous slurry of particulate calcium carbonate is provided at a pH of from about 11.0 to 12.0 and having from 2 to 5 g/l of excess calcium hydroxide. The slurry temperature is brought to the range of about 75.degree. to 80.degree. C., and sodium silicate solution is slowly mixed therewith to provide on a solid dry weight ratio from about 5 to 10% sodium silicate to calcium carbonate. Gaseous carbon dioxide is added to bring the slurry pH to the range of about 10.2 to 10.7, and the slurry is cooled to about 25.degree. to 30.degree. C. Finally zinc chloride is added to the cooled slurry to bring the pH to within the range of 7.5 to 8.0.

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patent: 2269470 (1942-01-01), Mowlds
patent: 2928802 (1960-03-01), Rehner et al.
patent: 3152001 (1964-10-01), Podschus et al.
patent: 3290165 (1966-12-01), Iannicelli
patent: 3373134 (1968-03-01), Yasui et al.
patent: 4167423 (1979-09-01), Williams
patent: 5000791 (1991-03-01), Tokarz et al.

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