The present invention relates to a powder including agglomerates of
hexagonal boron nitride platelets, wherein the agglomerates have an
agglomerate size distribution of from about 10 to about 125 microns and
the powder is substantially free of non-agglomerated platelets of boron
nitride and its use in a polymer blend. The present invention also relates
to a method of making a powder including agglomerates of hexagonal boron
nitride platelets. This method involves providing a briquette formed from
agglomerated hexagonal boron nitride platelets, crushing the briquette to
produce a powder including hexagonal boron nitride agglomerates and
non-agglomerated boron nitride platelets, and removing the
non-agglomerated boron nitride platelets from the powder under conditions
effective to produce a powder including agglomerates of hexagonal boron
nitride platelets having an agglomerate size distribution of from about 10
to about 125 microns.
