SPHERICAL MAGNESIUM OXIDE AND METHOD FOR PRODUCING SAME, RESIN FILLER, AND RESIN COMPOSITION
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United States of America Patent
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Issued Date -
Jan 23, 2025
app pub date -
Oct 14, 2022
filing date -
Oct 14, 2022
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Abstract
The object of the present invention is to provide spherical magnesium oxide having high sphericity and excellent moisture resistance and filling properties in resin without including a certain amount of boron or lithium, and a method for producing the same. The present invention is spherical magnesium oxide having the total content of elements belonging to the 3rd to 4th periods of the periodic table (except for the elements belonging to the 2nd and 18th groups) and yttrium of 500 to 12,000 ppm, having a volume-based cumulative 50% particle diameter (D50) measured by a laser diffraction/scattering particle size distribution measurement of 1 to 200 μm, and wherein a sphericity read from a SEM photomicrograph of 1.00 to 1.20.
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