| 摘要 |
A fine particle of aluminum hydroxide is disclosed, comprising a particulate aluminum hydroxide X having a specific surface area of 1.0 m<2>/g or less and a secondary particle size of 35 to 150 mum, a particulate aluminum hydroxide Y having a specific surface area of 1.0 m<2>/g or less and a secondary particle size of 10 to 35 mum and a particulate aluminum hydroxide Z having a specific area of 3.0 m<2>/g or less and a secondary particle size of 0.5 to 10 mum, in a compositional mass ratio falling in the area surrounded by four points of Point alpha, Point beta, Point gamma and Point delta including the lines in the ternary composition diagram shown in FIG. 1. By this fine particle of aluminum hydroxide, a fine particle of aluminum hydroxide and a resin composition comprising the fine particle of aluminum hydroxide, which can be reduced in the viscosity at the filling in a resin and attain high filling and when filled in a thermosetting resin, can be shortened in the curing time, can be provided.
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