Process for the preparation of hydroxyapatite

Details Process for the preparation of hydroxyapatite Process for the preparation of hydroxyapatite

1993-09-27

1995-04-11

Bell, Mark L.

Compositions: coating or plastic

Coating or plastic compositions

Dental

501 1, 423309, 423311, 424602, 424 57, C01B 2532, A61K 716

Patent

active

054054362

ABSTRACT:
A process for the preparation of a hydroxyapatite, which is suitable as a tooth-cleaning substance, by precipitation from aqueous phosphoric acid and calcium hydroxide solution, in which a calcium-doped phosphoric acid solution is fed to an intensive mixer with a suspension of calcium hydroxide/oxide in a molar ratio of Ca:P=1.667 corresponding to the hydroxyapatite of and reacted there at precipitation temperatures of 60.degree.-100.degree. C., preferably 80.degree.-90.degree. C. and a pH of 4-8, preferably of 6.5-7.5. Also disclosed in a tooth-cleaning substance containing the hydroxyapatite.

REFERENCES:
patent: 4274879 (1981-06-01), Irvine
patent: 4324772 (1982-04-01), Conn et al.
patent: 4849193 (1989-07-01), Palmer et al.
patent: 4931272 (1990-06-01), Dany et al.
patent: 5180564 (1993-01-01), Wahl et al.
Dany, "Kosmetik Und Aerosole", pp. 305-310, (1978) no month.
Meyer, CA, B 1142-55, Gmelins Handbuch, Anorganic Chemistry, Calcium, Part B, pp. 1142-1155, (1961) no month.

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