Patent ID: 8293816
Filing Date: 2012-10-23
Classification: C01F,C01P,C09C,Y10T

Abstract:
1. A mixed aluminum hydroxide powder for use in a flame retardant filler or thermally conductive filler upon formation of an electrical member, wherein: the mixed aluminum hydroxide powder is obtained by mixing an aluminum hydroxide powder X having an average secondary particle diameter (Dp) measured by a laser diffraction method in a range of 5 to 16 μm and a shape coefficient (φ) of 4 or less, and an aluminum hydroxide powder Y having an average secondary particle diameter (Dp) measured by the laser diffraction method in a range of 0.5 to 2.0 μm and a shape coefficient (φ) of 4 or less so that a weight ratio “X/Y” becomes 8/2 to 4/6, and the mixed aluminum hydroxide powder has an average secondary particle diameter (Dp) in a range of 1.6 to 5.9 μm; and a bending strength and an elastic modulus determined by a three-point bending test of a cured product for a test measuring 150 mm long by 15 mm wide by 8 mm thick obtained by blending the mixed aluminum hydroxide powder at a ratio of 54 wt % with respect to an acrylic resin syrup and subjecting the resultant to heat curing are as described below: bending strength: 80.0 MPa or more elastic modulus: 5152 MPa or less.