| 摘要 |
<p>Provided is an aluminum hydroxide powder used as a resin filler having excellent resin filling properties. Also provided is a method for producing the same. The aluminum hydroxide powder used as a resin filler has a gibbsite crystal structure; the average grain diameter in the grain diameter distribution as determined by laser scattering is between 2.0 and 4.0 µm; the ratio D90/D10 of secondary grain diameter D10, which is the diameter of 10% of the cumulative mass from the microparticle portion, and the secondary grain diameter D90, which is the diameter of 90% of the cumulative mass from the microparticle portion, is between 4.0 and 6.0; D2 and D1 satisfy formula (1) 2xD1 = D2 = 4xD1 (1) when there are two or more frequency maximums within a grain diameter range I that is between 0.5 and 5.0 µm, with D2 being the maximum grain diameter of the frequency maximum having the largest maximum grain diameter of the frequency maximums within the grain diameter range I and D1 being the maximum grain diameter of the frequency maximum showing the smallest maximum grain diameter; the intensity ratio I (110)/I (002) of the peak at crystal faces (110) and (002) as determined by powder X-ray diffraction is between 0.30 and 0.45; and the total sodium content is 0.10 wt% or less in terms of Na2O.</p> |
