ALKALI-EARTH ALUMINOSILICATE GLASS COMPOSITIONS WITH IMPROVED CHEMICAL AND MECHANICAL RESISTANCE Russian patent published in 2019 - IPC C03C3/87 

FIELD: chemistry.

SUBSTANCE: invention relates to aluminosilicate glass compositions containing an alkali-earth metal, with improved chemical and mechanical resistance, which are used, in particular, for making pharmaceutical packages. Glass composition includes from approximately 67 mol. % to approximately 75 mol. % SiO₂, from about 6 mol. % to about 12.5 mol. % Al₂O₃, from about 5 mol. % to about 12 mol. % of an alkali metal oxide and from about 9 mol. % to about 15 mol. % alkali-earth metal oxide. Alkali metal oxide contains at least Na₂O and K₂O.

EFFECT: glass composition is free of boron and boron compounds and is capable of ionic exchange, thereby promoting chemical glass hardening to improve mechanical resistance.

13 cl, 1 dwg