NON-ALKALI GLASS, ITS PRODUCTION METHOD, AND GLASS SUBSTRATE FOR FORMING TFT (THIN FILM TRANSISTOR) OF LIQUID CRYSTAL DISPLAY

PROBLEM TO BE SOLVED: To provide a non-alkali glass which has characteristics such as chemical durability, low thermal expansion property, high strain point, low specific gravity and high Young's modulus, has less defects such as foams and is excellent in production stability.SOLUTION: The non-...

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1. Verfasser:	HACHITANI YOICHI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING GLASS JOINING GLASS TO GLASS OR OTHER MATERIALS METALLURGY MINERAL OR SLAG WOOL NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a non-alkali glass which has characteristics such as chemical durability, low thermal expansion property, high strain point, low specific gravity and high Young's modulus, has less defects such as foams and is excellent in production stability.SOLUTION: The non-alkali glass has: an average thermal expansion coefficient at 30-300°C in the range of (30-35)×10/°C; strain point of at least 670°C; Young's modulus of at least 70 GPa; specific gravity of less than 2.4; liquid phase temperature of less than 1,200°C; temperature showing the viscosity of 10Pa s of less than 1.600°C; and less than 1 mg/cmof the mass decrease after the immersion in an aqueous solution of nitric acid at 50°C having the concentration of 1 mol/L for 50 hr. The glass contains, by mol, 65.0-70.0% of SiO, 9.5-12.5% of AlO, 8.5-11.5% of BO(provided that SiO+AlO+BOis 87.5-90.0 mol%, and BO/(SiO+AlO) is 0.12-0.14), 2.5 to less than 4.0% of MgO, 5.0-10.0% of CaO, 0.1-2.5% of SrO (provided that MgO+CaO+SrO is 10.0-12.5 mol%), and does not substantially contain BaO, ZnO and PbO.