Patent ID: 6420288
Filing Date: 2002-07-16
Classification: A61K,C03C

Abstract:
A process for the preparation of shaped translucent lithium disilicate glass ceramic products, which comprises(a) producing a melt of a starting glass containing the following components ComponentWt. %SiO257.0 to 80.0Al2O3â€‚â€‰0 to 5.0La2O30.1 to 6.0MgOâ€‚â€‰0 to 5.0ZnOâ€‚â€‰0 to 8.0Li2O11.0 to 19.0where (i) Al2O3 + La2O3 accounts for 0.1 to 7.0 wt. % and (ii) MgO + ZnO accounts for 0.1 o 9.0 wt. %, (b) shaping the melt of the starting glass and cooling it, and (c) subjecting the shaped glass product to at least one heat treatment in the temperature range from 400 to 1100Â° C. in order to obtain a shaped glass ceramic product in the form of a blank.