High-expansion bonding glass having improved water resistance and uses thereof

US10654745B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Ina Mitra · Stadecken-Elsheim, DE
• Miriam Kunze · Saulheim, DE
• Linda Johanna Bartelt · Landshut, DE
• Sabrina Wimmer · Altdorf, DE
• Frank Kroll · Landshut, DE
• Hauke Esemann · Wörrstadt, DE
• Bernd Hoppe · Ingelheim am Rhein, DE
• Jorg Witte · Pfungstadt, DE

Key dates

• Filing date: Aug 30, 2018
• Grant date: May 19, 2020
• Expiry date: Aug 30, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2207/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present disclosure relates to a bonding glass which has improved water resistance and has a coefficient of thermal expansion α(25-300) of from 14·10−6K−1 to 17·10−6K−1, comprising, in mol % on an oxide basis, 5-7 of B2O3, 10-14 of Al2O3, 36-43 of P2O5, 15-22 of Na2O, 12.5-20 of K2O, 2-6 of Bi2O3 and >0-6 of R oxide, where R oxide is an oxide selected from the group consisting of MnO2 and SiO2 and SnO2 and Ta2O5 and Nb2O5 and Fe2O3 and GeO2 and CaO. The bonding glass is free of PbO except for, at most, impurities. The bonding glass may have a glass transition temperature Tg of from 390° C. to 430° C. The present disclosure also relates to uses of this bonding glass.