Dispersible alpha alumina monohydrate

Details Dispersible alpha alumina monohydrate Dispersible alpha alumina monohydrate

1984-10-05

1987-05-19

Terapane, John F.

Compositions

Leather or fur treating

252 8511, 2523157, 423629, C09K 700, C01F 702, B01J 1300

Patent

active

046666141

ABSTRACT:
An alpha alumina monohydrate, AlO(OH), powder is produced which is capable of readily dispersing in aqueous solutions to yield a shear-rate thinning mixture. The alpha alumina monohydrate is made by reacting an acid reactant and a base reactant, wherein at least one contains aluminum, in an aqueous medium in proportions to yield a solution having a pH of from about 7.5 to 10. Then the mixture is given the unique heat treatment at a temperature of from about 60.degree. to 100.degree. C. for a period of from about 2 to 7 hours. The excess water is removed from the product such as by filtration. The solid can be optionally washed to remove by-product salts. The solid product can be readily redispersed in water to yield a shear-rate thinning liquid without the aid of any further acid or base or the use of excessive high shear mixing. The solid product can be further dried to recover a solid product with greater than 10% AlO(OH) and even greater than 35% AlO(OH).

REFERENCES:
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patent: 3739062 (1973-06-01), Barsotti
patent: 3975509 (1976-08-01), Royer
patent: 4055509 (1977-10-01), Weimer
patent: 4117105 (1978-09-01), Hertzenberg
patent: 4240915 (1980-12-01), Block
patent: 4244835 (1981-01-01), Block
patent: 4313923 (1982-02-01), Block et al.
patent: 4492682 (1985-01-01), Trebillon
patent: 4584108 (1986-04-01), Block

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