Methods of synthesizing hydroxyapatite powders and bulk materials
US5858318A · kind A · utility
Inventor
Key dates
| Filing date | Nov 27, 1996 |
| Grant date | Jan 12, 1999 |
| Priority date | — |
| Expiry date | Nov 27, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/622
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Methods are provided for producing non-porous controlled morphology hydroxyapatite granules of less than 8 .mu.m by a spray-drying process. Solid or hollow spheres or doughnuts can be formed by controlling the volume fraction and viscosity of the slurry as well as the spray-drying conditions. Methods of providing for homogenous cellular structure hydroxyapatite granules are also provided. Pores or channels or varying size and number can be formed by varying the temperature at which a hydroxyapatite slurry formed in basic, saturated ammonium hydroxide is spray-dried. Methods of providing non-porous controlled morphology hydroxyapatite granules in ammonium hydroxide are also provided. The hydroxyapatite granules and bulk materials formed by these methods are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.