Process for the preparation of a dicalcium phosphate dihydrate s

Details Process for the preparation of a dicalcium phosphate dihydrate s Process for the preparation of a dicalcium phosphate dihydrate s

1994-02-17

1995-06-27

Langel, Wayne

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423265, 424 57, C01B 2532

Patent

active

054277558

ABSTRACT:
In the process for the preparation of dicalcium phosphate dihydrate, which has a good compatibility with fluorine and stability to hydrolysis and causes the minimum possible after-thickening when used in tooth-pastes, by reaction of calcium carbonate suspended in water with an aqueous solution of orthophosphoric acid, precipitation of dimagnesium phosphate trihydrate, as a stabilizer, by reaction of aqueous solutions of a magnesium salt and of orthophosphoric acid in the presence of a basic compound and final filtration, drying and grinding of the precipitate, 0.2 to 0.8% by weight of polyphosphoric acid, calculated with respect to the dicalcium phosphate dihydrate precipitated in the reaction mixture, is added to the reaction mixture as a further stabilizer.

REFERENCES:
patent: 3012852 (1961-12-01), Nelson
patent: 4247526 (1981-01-01), Jarvis et al.
patent: 4496527 (1985-01-01), Sherif et al.
patent: 4931272 (1990-06-01), Dany et al.

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