Method of producing colored precipitated calcium carbonate

Chemistry of inorganic compounds – Carbon or compound thereof – Oxygen containing

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106465, 423165, C01F 1118

Patent

active

051205211

ABSTRACT:
A colored precipitated calcium carbonate having a strong color fastness in water is produced by preparing an aqueous slurry containing calcium hydroxide and a water-soluble dye, for example, a direct dye, introducing a carbon dioxide-containing gas into the aqueous slurry, and collecting the resultant colored precipitated calcium carbonate from the aqueous slurry at a pH of 8.2 or more thereof.

REFERENCES:
patent: 3347625 (1967-10-01), Taylor
patent: 4018877 (1977-04-01), Woode
patent: 4559214 (1985-12-01), Howard et al.
patent: 4661164 (1987-04-01), Severinghaus

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