To obtain aluminum nitride that can homogeneously disperse in a resin by kneading, excellent in fluidity with no occurrence of coagulation and is useful as a filler in an encapsulant for electronic parts requiring heat radiation by mixing an aluminum nitride powder with a fluidity modifier.
An aluminum nitride powder, preferably with an average particle size of 0.1-4μ is mixed with a fluidity modifier, preferably one or more kinds of inorganic powders selected from silica, alumina, titania and boron nitride and bearing a lipophilic group. Aluminum nitride powder is treated with a phosphoric acid compound (for example, orthophosphoric acid), then mixed with the fluidity modifier. The amount of the fluidity modified to be added is 0.1-20wt.%, preferably 0.5-10wt.%. The fluidity modifier has preferably particle sizes of ≤1μ.
JINBO TAKASHI
YASUTAKE TAKESHI
HARADA ISAO
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