Patent ID: 7273521

Claim:
A method of producing a calcium carbonate/dicalcium phosphate composite material exhibiting a Ca/P mole ratio of greater than 1.0 comprising the steps of a) providing a solid material selected from the group consisting of lime and calcium carbonate and any mixtures thereof; b) introducing an amount of concentrated phosphoric acid to the solid material of step a) to form a resultant solution of said solid materials and said concentrated phosphoric acid, wherein said concentrated phosphoric acid is first diluted with an amount of water of from 30 mL to 80 mL per 350 g of the solid material of step a), and wherein said concentrated phosphoric acid is added in an amount in which the stoichiometric ratio of said solid material of step a) to said concentrated phosphoric acid is greater than 1; c) mixing the resultant solution of step b) to form resultant particles of said calcium carbonate/dicalcium phosphate composite materials; d) collecting said resultant particles from mixing step c), and e) drying said resultant particles of step d).