Boehmite with high thermal conductivity and method for preparation thereof

Provided are high thermal conductive boehmite, which sustains the characteristics of boehmite such as flame retardant properties and high filling degree and yet has an improved thermal conductivity, and a method for manufacturing high thermal conductive boehmite. The high thermal conductive boehmite is characterized by having a thermal conductivity calculated in accordance with formula (1) of 11.0 W/m.k or greater. In formula (1): Vf represents the volume filling ratio of boehmite; [lambda]c represents the thermal conductivity (W/m.k) of a boehmite-resin composite; [lambda]f represents the thermal conductivity (W/m.k) of boehmite; [lambda]m represents the thermal conductivity (W/m.k) of the resin; n represents the shape factor of filler particles proposed by Hamilton and Crosser; [Psi] represents a value calculated by dividing the surface area of a sphere that has the same volume of a boehmite particle volume with the surface area of an actual particle; and represents exponentiation.