ENHANCED BORON NITRIDE COMPOSITION AND COMPOSITIONS MADE THEREWITH

A method for coating BN by first introducing reactive sites on the surface of the BN prior to the subsequent surface functionalizing step is provided, wherein the two-step coating process improves adhesion of the coating material to the BN surface as compared with some of the processes in the prior art by providing a more stable surface coating as compared with the coating methods in the prior art. As a boron nitride composition comprising boron nitride powder having its surface treated with at least one over-coating layer comprising at least one of a silane, a siloxane, a carboxylic acid derivative and mixtures thereof, the over-coating layer having at least one reactive functional group, the boron nitride composition is characterized in that the over-coating layer is adhered to 2% or more of the surface of boron nitride. A polymer composite comprises: a polymer matrix selected from the group of melt-processable polymers, polyesters, phenolics, silicone polymers, acrylics, waxes, thermoplastic polymers, low molecular weight fluids, epoxy molding compounds, and mixtures thereof; and a filler comprising particles of boron nitride of which surfaces are treated with at least one coating compound comprising at least one of a silane, a siloxane, a carboxylic acid derivative, and mixtures thereof, wherein the coating compound is adhered to 10% or more of the surface of boron nitride.