Magnesium hydroxide having fine, plate-like crystalline structure and process therefor
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United States of America Patent
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Sep 1, 1992
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N/A
app pub date -
Dec 26, 1990
filing date -
Dec 26, 1990
priority date (Note) -
Expired
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Abstract
Novel magnesium hydroxide having a fine, plate-like crystalline structure, a median particle size of up to about 1 micron and a particle size distribution in which about 90% of said magnesium hydroxide particles are less than about 3.5 microns is prepared by a flash precipitation process in which less than or greater than an equivalent amount of alkaline material is reacted with a magnesium salt in a concentrated aqueous mixture thereof. Ultrasonic mixing means is used to combine heated aqueous streams of an alkaline material and a magnesium containing solution followed by a post heat treatment. The magnesium hydroxide is especially useful in providing flame retardancy in admixture with thermoplastic resins.
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