Patent ID: 6797048
Filing Date: 2004-09-28
Classification: A61K,C03C

Abstract:
A method for preparing a glass-ceramic containing leucite crystals, comprising the steps of:mixing (1) a glassy material comprising 53 to 65 wt. % of SiO2, 13 to 23 wt. % of Al2O3, 9 to 20 wt. % of K2O and 6 to 12 wt. % of Na2O, and (2) synthetic leucite seed crystals comprising 53 to 64 wt. % of SiO2, 19 to 27 wt. % of Al2O3 and 17 to 25 wt. % of K2O; and heat-treating the mixture at 750 to 950Â° C. for 1 to 5 hours.