Chemistry of inorganic compounds – Carbon or compound thereof – Oxygen containing
Patent
1986-05-08
1987-12-22
Straub, Gary P.
Chemistry of inorganic compounds
Carbon or compound thereof
Oxygen containing
423430, C01F 524, C01F 1118
Patent
active
047146036
ABSTRACT:
A precipitated calcite of substantially spherical morphology having an average spherical diameter of from 2 to 10 microns and a specific surface area of from 1 to 15 square meters per gram is prepared by introducing carbon dioxide gas into an aqueous slurry of calcium hydroxide containing dissolved polyphosphate in the amount of from 0.1 to 1.0 percent, calculated as grams of phosphorus per 100 grams of the calcite equivalent of the calcium hydroxide, the starting temperature of the carbonation being 15.degree. to 50.degree. C. The spherical calcite is particularly suitable for use in dull finish coated paper.
REFERENCES:
patent: 3179493 (1965-04-01), Diekmann et al.
patent: 3304154 (1967-02-01), Kiouzes-Pezas
patent: 3848059 (1974-11-01), Erneta
patent: 4018877 (1977-04-01), Woode
patent: 4157379 (1979-06-01), Arika et al.
patent: 4237147 (1980-12-01), Mertew et al.
patent: 4244933 (1981-01-01), Shibazaki et al.
Reitemeier et al, J. Phys. Chem., 44, 535-551 (1940).
Buehrer et al, J. Phys. Chem., 44, 552-574 (1940).
Nakahara et al, J. Chem. Soc., Japan, 5, 732-6 (1976), with English translation.
Kamiya et al, Mat. Res. Bull., 12, 1095-1102 (1977).
Akers Lawrence C.
Ordway Harold W.
Pfizer Inc.
Richardson Peter C.
Straub Gary P.
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