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US 11,884,553 B2Granted
Magnesium oxide powder, thermally conductive filler, resin composition, and production method for magnesium oxide powder
AssigneeUbe Material Industries, Ltd.
InventorsIsamu Fujikawa, Masamichi Nakagawa, Takashi Hamaoka, Takeshi Himoto, Seiji Yamaguchi, Kunio Watanabe
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Abstract
This magnesium oxide powder contains secondary particles in which a plurality of primary particles of magnesium oxide having a crystal phase and a grain boundary phase are at least partially fused together by the grain boundary phase, and a median diameter obtained by a laser diffraction scattering method is 300 μm or less.
Claims10
A magnesium oxide powder comprising:
- secondary particles in an amount of 50% by number or more, wherein in the secondary particle, a plurality of primary particles of magnesium oxide having a crystal phase and a grain boundary phase are at least partially fused together by the grain boundary phase,
- wherein a median diameter of the secondary particles obtained by a laser diffraction scattering method is 300 μm or less, and
- a ratio of the median diameter of the secondary particles to a volume average equivalent circle diameter of the primary particles of magnesium oxide obtained by analyzing an image taken with an electron scanning microscope is in a range of 1.5 or more and 5.0 or less.
Dependencies are inferred from the claim text.