Patent ID: 6667258
Filing Date: 2003-12-23
Classification: C03C,C08K

Abstract:
A tin-free zinc phosphate glass consisting essentially, expressed in terms of mole percent on the oxide basis, of 32.5-34.0% P2O5, 0.7-1.7% Al2O3, 7-11% Li2O, 9-13% Na2O, 4-6% K2O, with Li2O+Na2O+K2O being 23-26%, 27-34% ZnO, 1-6% CaO, 0-8% BaO, 0-8% SrO, and 0-1% SiO2, with SrO+BaO being no more than 8%, said glass exhibiting a stable glass transition temperature Tg below 450Â° C. that fluctuates within Â±5Â° C. of the target Tg in different melts, a working temperature below 500Â° C., and a water durability of no more than 5Ã—10âˆ’7 g/cm2/min after immersion in water at 95Â° C. for 24 hours.