Patent ID: 10781352

Abstract:
A hexagonal boron nitride (hBN) powder containing an aggregate of primary particles of hBN, in which the powder has a primary particle size of less than 10 μm, a ratio of an average longer diameter (L1) to an average thickness (d1) of the primary particles, [L1/d1], of 5.0 or more and 20 or less, and a BET specific surface area of less than 10 m2/g. The powder has one maximum peak in a range of a particle size of 45 μm or more and 150 μm or less in a particle size distribution curve of a hexagonal boron nitride powder classified to have a particle size of 45 μm or more and 106 μm or less, and has a decrease rate of the maximum peak of 10% or more and less than 40%.