Patent ID: 6160042
Filing Date: 2000-12-12
Classification: C08K

Abstract:
A method for forming a low viscosity high thermal conductivity polymer composite containing particles of hexagonal boron nitride comprising the steps of: (a) treating the surface of the hexagonal boron nitride particles with 1,4-phenylene diisocyanate, (b) thereafter reacting the thus-treated boron nitride particles with a compound of the formulaH.sub.2 N--X--YwhereX is a linear or branched aliphatic group having from 1 to 40 carbon atoms, or a substituted or unsubstituted phenylene group wherein the substituents are methyl, ethyl, propyl, hydroxyl, nitro, methoxy, ethoxy, phenyl, or another Y group or one or more F or CF.sub.3 groups,Y is hydroxyl, amino, methyleneamino, ethyleneamino, amido, thiol, epoxy, vinyl, acetylenyl, silanol, nitrile, carboxyl, methacryl, acryl, allyl, anhydride, cyanate, norbornenyl, or maleimido and, where applicable, may have additional substituents selected from the group consisting of --CF.sub.3, --CF.sub.2 CF.sub.3, and, --CF.sub.2 CF.sub.2 CF.sub.3, and (c) combining the surface treated hexagonal boron nitride particles with a compound selected from the group consisting of benzoxazine, epoxy resins and novolac or resol phenolic resins and reacting the compound filled with treated boron nitride to form said low viscosity high thermal conductivity polymer composite.