ALKALINE-EARTH ALUMINOSILICATE GLASS COMPOSITIONS WITH IMPROVED CHEMICAL AND MECHANICAL STABILITY Russian patent published in 2017 - IPC C03C3/87 C03C4/20 

FIELD: chemistry.

SUBSTANCE: glass composition comprises from 67 mol % to 75 mol % SiO₂, from 6 mol % to 10 mol % Al₂O₃, from 5 mol % to 12 mol % of an alkali metal oxide and from 9 mol % to 15 mol % of an alkaline earth metal oxide. The alkali metal oxide contains at least Na₂O and K₂O, the content of K₂O is less than or equal to 0.5 mol %. The alkaline earth metal oxide contains CaO, MgO, and optionally BaO and SrO. The glass composition is free from boron and boron compounds and is capable of ion exchange, thereby promoting chemical hardening of the glass to improve mechanical resistance. The coefficient of thermal expansion of glass is less than 60⋅10^-7 K^-1.

EFFECT: improving the chemical and mechanical resistance of the composition.

15 cl, 21 ex, 4 tbl, 1 dwg