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

1994-02-07

1995-06-27

Langel, Wayne

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423275, C01B 2532

Patent

active

054277566

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 toothpastes, 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 subsequent addition of tetrasodium pyrophosphate to the reaction mixture as a further stabilizer and final filtration, drying and grinding of the precipitate, 0.2 to 0.6% by weight of tetrasodium pyrophosphate, calculated with respect to the dicalcium phosphate dihydrate precipitated in the reaction mixture, is added to the aqueous reaction mixture.

REFERENCES:
patent: 2287699 (1942-06-01), Moss et al.
patent: 4193973 (1980-03-01), Jarvis et al.
patent: 4931272 (1990-06-01), Dany et al.
patent: 5024825 (1991-06-01), Buhl et al.

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