Process for the production of an aqueous suspension of hydroxyla

Details Process for the production of an aqueous suspension of hydroxyla Process for the production of an aqueous suspension of hydroxyla

1991-11-22

1993-01-19

Langel, Wayne

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423308, 423311, C01B 2532

Patent

active

051805642

ABSTRACT:
A process for the production of an aqueous suspension of hydroxylapatite from calcium hydroxide or calcium oxide, and phosphoric acid in which, while stirring, phosphoric acid is slowly added to an aqueous solution or suspension of the calcium compound up to a calcium/phosphorus mole ratio of 10:6, wherein the course of the reaction and the achievement of the end point of the reaction is determined by the conductivity of the solution or suspension. The process results in the production of essentially pure hydroxylapatite, which is useful as, for example, a teeth cleaning agent, a bone-replacement, or as a carrier material for pharmaceutical compositions.

REFERENCES:
patent: 3387925 (1968-06-01), Vanstrom et al.
patent: 4274879 (1981-06-01), Irvine
patent: 4324772 (1982-04-01), Conn et al.
patent: 4448758 (1984-05-01), Nagai et al.
patent: 4849193 (1989-07-01), Palmer et al.

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