ALUMINUM HYDROXIDE MICROPOWDER USED AS RESIN FILLER AND METHOD FOR PRODUCING THE SAME

摘要

The present invention provides an aluminum hydroxide powder used as a resin filler having an excellent resin filling property. The present invention also provides a method for producing the same. The aluminum hydroxide powder used as the resin filler has a gibbsite crystal structure; An average particle diameter in the particle size distribution measured by laser scattering is 2.0 to 4.0 mu m; The ratio D90 / D10 of the secondary particle diameter D90 at which the secondary particle diameter D10 at which the weight accumulation from the particle portion is 10% and the weight accumulation at 90% from the particle portion is 4.0 to 6.0; When there are two or more frequency peaks in the particle diameter range I of 0.5 to 5.0 μm, D2 and D1 satisfy the following inequality (1): 2 占 D1? D2? 4 占 D1 (1) (Wherein D2 is the maximum maximum particle diameter with the largest maximum particle diameter in the particle diameter range I and D1 is the maximum maximum particle diameter with the smallest maximum particle diameter) ; The intensity ratio I (110) / I (002) of the peaks of the crystal plane 110 and the peak (002) by powder X-ray diffraction measurement is 0.30 to 0.45; The total sodium content is 0.10% by weight or less in terms of Na ₂ O.