ALUMINUM HYDROXIDE, PROCESS FOR PREPARATION THEREOF AND COMPOSITION

摘要

Aluminum hydroxide having a particle size of 2 to 30 .mu.m and having small specific surface area and low resin filling viscosity can be prepared by using precipitated aluminum hydroxide composed of secondary agglomerated particles having a primary particle size almost equal to the desired average particle size of intended pulverized aluminum hydroxide as the starting material to be pulverized and pulverizing this starting aluminum hydroxide. This aluminum hydroxide has an average particle size of 2 to 30 .mu.m, a surface roughness coefficient Sr/Sc (in which Sr represents the specific surface area of particles measured by the nitrogen adsorption method and Sc represents the specific surface area calculated from the size of particles approximated to sphe res while taking the particle size distribution of particles into consideration) sma ller than 2.5 and a linseed oil absorportion smaller than 30 cc/100 g as determined according to JIS K-5101.