Patent ID: 9260342
Filing Date: 2016-02-16
CPC Classification: A61K,C03B,C03C

Claim Text:
1. A process for preparing a glass-ceramic body comprising the steps of providing a basic glass body and subjecting the basic glass body to a thermal treatment whereby a crystalline phase embedded in a glass matrix is formed, wherein the basic glass body is made of a composition comprising 65 to 72 wt-% SiO 2 , at least 10.1 wt-% Li 2 O and at least 10.1 wt-% Al 2 O 3 based on the total weight of the composition, the proportion of Li 2 O to Al 2 O 3 being from 1:1 to 1.5:1, and the thermal treatment involves a nucleation step followed by a first crystallization step at a first temperature range and a second crystallization step at a second temperature range different from the first temperature range, wherein at least two different crystalline phases are formed.