Patent ID: 7807724

Claim:
A method for preparing dispersions of calcium phosphate platelets, wherein the length of the platelets, L, is between 5 and 500 nm and the thickness of the platelets is between 0.5 and 20 nm, and at least one polymer which complexes calcium comprising the steps of: i) preparing a solution of calcium salts and adjusting the pH to a selected value of between 4 and 6; ii) adding a phosphate solution to the solution obtained in step i) over a period of time of between 30 minutes and 4 hours, so as to obtain a calcium to phosphorus molar ratio of between 1 and 2.5, wherein the pH is maintained constant at the selected value of between 4 and 6 until a calcium phosphate platelet dispersion is formed; iii) heat treating the dispersion obtained in step ii) at a temperature of between 50° C. and 95° C.; iv) washing the dispersion obtained in step iii); v) adding a dispersion agent to the dispersion obtained in step iv); vi) separating the colloidal dispersion obtained in step v); wherein in at least one of steps i) or ii), the solutions further comprise ammonium ions; and wherein at least one polymer which complexes calcium is added during step i) or ii).