Aluminum hydroxide and method for production thereof

Abstract

A method for the production of aluminum hydroxide includes the steps of suspending aluminum hydroxide obtained by the Bayer process in a sodium aluminate solution to obtain slurry and elevating a temperature of the slurry from 60° C. or less to 90° C. or more. The aluminum hydroxide has an average particle diameter D in a range of 1 to 10 μm, a BET specific surface area S of 1.5 m2/g or less, a degree of aggregation D/Dbet of less than 3, wherein Dbet stands for a particle diameter calculated by spherical approximation from the BET specific surface area S as Dbet=6(S×ρ), in which ρ denotes a specific gravity of the aluminum hydroxide, and a content of particles having diameters exceeding 20 μm that is 0.5% or less by mass. A composition that contains the aluminum hydroxide as filler, can be formed.

Dependencies are inferred from the claim text.