POROUS CALCIUM CARBONATE COMPOUND AND PRODUCTION THEREOF

Japanese Patent JP3634404

B2

PURPOSE: To obtain a porous calcium carbonate compound having porous surface and excellent quality and performance at a low cost by reacting calcium carbonate with a phosphoric acid compound.
CONSTITUTION: A porous calcium carbonate compound having a number of pores on the surface is produced by reacting calcium carbonate with a phosphoric acid compound. The reaction temperature is preferably 15-30°C. If the reaction does not sufficiently proceed under the above reaction condition, both components are mixed with each other and the temperature is further raised by about 15-20°C. Pores having irregular form are liable to form when the reaction is performed at ≥50°C) from the start. The phosphoric acid compound is preferably charged generally to an aqueous slurry of the calcium carbonate. In this case, it is preferable to charge the phosphoric acid compound spending 30-60min or longer in place of charging the compound at a stroke. The coagulation of particles and the formation of irregular pores are liable to occur by charging the phosphoric acid compound at a stroke.

JPS5423635	CALCIUM CARBONATE PIGMENT FOR USE IN COATING
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JP6656969	Spherical calcium carbonate particles and their manufacturing method

Higashi Toshio
Hiroshi Shibata
Takiyama Shigeo
Toshio Fujiwara

JP12958394A

March 30, 2005

May 18, 1994

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Maruo Calcium Co., Ltd.

C01F11/18; A01N25/08; C09K3/00; C09K3/10; C10M125/24; C10M175/00; D21H19/38; (IPC1-7): C01F11/18

JP3068370A
JP6057167A
JP53056174A
JP54035897A
JP63190711A
JP60090819A
JP4349116A
JP3190972A
JP54111000A
JP49034500A

Kenji Itami

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