Basic magnesium carbonate and process for preparation thereof
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United States of America Patent
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Aug 31, 1993
Issued Date -
N/A
app pub date -
Aug 17, 1992
filing date -
Jun 17, 1991
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Expired
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Abstract
Disclosed is a novel basic magnesium carbonate represented by the following general formula: nMgCO.sub.3.Mg(OH).sub.2.mH.sub.2 O wherein n is a number of from 3 to 5 and m is a number of from 3 to 5, which consists of porous particles composed of an aggregate of plate crystals having an average particle size of 1 to 50 .mu.m and a specific surface area of 10 to 70 m.sup.2 /g, wherein in the fine pore size distribution of the particles, the volume of fine pores having a radius smaller than 100 .ANG. is at least 0.02 cc/g and the volume of fine pores having a radius smaller than 75,000 .ANG. is at least 0.8 cc/g. This novel basic magnesium carbonate is highly improved over conventional basic magnesium carbonate in such properties as filling property, dispersibility and flowability.
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