Agglomerated boron nitride particles, production method for agglomerated boron nitride particles, resin composition including agglomerated boron nitride particles, moulded body, and sheet

An agglomerated boron nitride particle ( “agglomerated BN particle”) constituted by boron nitride primary particles (“BN primary particles”), wherein a peak area intensity ratio ((100)/(004)) of a (100) plane to a (004) plane of the BN primary particles is 0.25 or more, the peak intensity ratio being obtained by subjecting, to a powder X-ray diffraction measurement, a pellet-shaped sample moulded at a moulding pressure of 0.85 ton/cm 2 using a 10 mmφ powder pellet moulding machine, the average crystallite size of the BN primary particles obtained from a (002) plane peak of the BN primary particles is 375 Å or more, the average crystallite size being obtained as a result of filling a glass sample plate having a depth of 0.2 mm with the agglomerated BN particles in such a way that the sample surface becomes smooth, and subjecting the agglomerated BN particles to a powder X-ray diffraction measurement, and an average particle diameter D 50 of the agglomerated BN particle is 26 μm or more.

A sheet comprising agglomerated boron nitride particles (“agglomerated BN particles”), wherein a peak intensity ratio ((100)/(004)) of a (100) plane to a (004) plane of boron nitride primary particles (hereinafter referred to as “BN primary particles”) in the sheet obtained by subjecting the sheet to an X-ray diffraction measurement is 1.0 or more, an average crystallite size of the BN primary particles obtained from a (002) plane peak of the BN primary particles in the sheet obtained by subjecting the sheet to an X-ray diffraction measurement is 375 Å or more, and an average particle diameter D 50 of the agglomerated BN particles is 26 μm or more.