Patent ID: 11884553
Assignee: UBE MATERIAL INDUSTRIES, LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. 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.