Spherical boron nitride particles, filler for resins, resin composition, and method for producing spherical boron nitride particles

Abstract

Provided are spherical boron nitride particles having a B1s/O1s ratio of 90 or and less, the B1s/O1s ratio being a ratio of a semiquantitative value calculated from an O1s peak intensity measured by X-ray photoelectron spectroscopy and a semiquantitative value calculated from a B1s peak intensity. For viscosities, measured at 25° C. with a shear rate being changed from 0.01 (1/s) to 100 (1/s), of a mixture in which 15 volume % of the spherical boron nitride particles are filled in an epoxy resin, a thixotropy index (T.I. index) represented by a ratio (η1/η2) of a viscosity η1 measured when the shear rate is 1 (1/s) and a viscosity η2 measured when the shear rate is 10 (1/s) is preferably 2 or less.

Dependencies are inferred from the claim text.