Process of producing needle-shaped calcium carbonate particles
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United States of America Patent
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Apr 25, 1989
Grant Date -
N/A
app pub date -
Mar 17, 1988
filing date -
Mar 17, 1988
priority date (Note) -
Expired
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Abstract
Disclosed is a novel process of producing needle-shaped calcium carbonate particles. In the process of the present invention, aqueous calcium hydroxide solution is added to an aqueous medium bath with a temperature of not less than 60.degree. C. into which carbon dioxide gas or a carbon dioxide-containing gas is being blown to generate needle-shaped calcium carbonate particles. The temperature of the aqueous medium bath is kept not less than 60.degree. C. during the addition of the aqueous calcium hydroxide solution. Then the generated needle-shaped calcium carbonate particles are recovered.
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