Method of producing colored precipitated calcium carbonate

Details Method of producing colored precipitated calcium carbonate Method of producing colored precipitated calcium carbonate

C - Chemistry, Metallurgy

09

C

8/5

C09C 1/02 (2006.01)

Patent

CA 2034190

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.

Production, à l'état de précipité, d'un carbonate de calcium coloré (caractérisé par une grande solidité de la couleur), consistant à préparer une suspension aqueuse contenant de l'hydroxyde de calcium et un colorant hydrosoluble, par exemple un colorant direct, à introduire un gaz renfermant du dioxyde de carbone dans la suspension aqueuse, et à recueillir, à partir de la suspension aqueuse à un pH de 8,2 ou plus, le précipité coloré de carbonate de calcium obtenu.

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