Magnesium hydroxide particles with slow growth rate and low aspect ratio and their manufacturing method

摘要

PROBLEM TO BE SOLVED: To provide magnesium hydroxide particles and magnesium oxide particles which are excellent in dispersibility when blended with a resin and a rubber and enables highly filling, and to provide a method for producing them.SOLUTION: There are provided magnesium hydroxide particles and a method for producing the same, where in a heat treatment step for growing magnesium hydroxide particles after synthetic reaction, a growth of a crystallite constituting the particles is controlled by providing two-stage production steps of which pressures, temperatures and times are different from each other, magnesium hydroxide particles, and as a result, magnesium hydroxide particles are obtained which have a rounded polygonal shape and a low aspect ratio, have a uniform particle size, and have a low bulk density.SELECTED DRAWING: Figure 5