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1. (JP2007039324) MANUFACTURING METHOD OF ALKALI-FREE GLASS AND ALKALI-FREE GLASS PLATE

Office : Japan
Application Number: 2006185587 Application Date: 05.07.2006
Publication Number: 2007039324 Publication Date: 15.02.2007
Publication Kind : A
IPC:
C03C 3/091
C03B 5/225
G02F 1/1333
H01J 5/02
C CHEMISTRY; METALLURGY
03
GLASS; MINERAL OR SLAG WOOL
C
CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
3
Glass compositions
04
containing silica
076
with 40% to 90% silica by weight
089
containing boron
091
containing aluminium
C CHEMISTRY; METALLURGY
03
GLASS; MINERAL OR SLAG WOOL
B
MANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL; SUPPLEMENTARY PROCESSES IN THE MANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL
5
Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
16
Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
225
Refining
G PHYSICS
02
OPTICS
F
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1
Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
01
for the control of the intensity, phase, polarisation or colour
13
based on liquid crystals, e.g. single liquid crystal display cells
133
Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
1333
Constructional arrangements
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
J
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
5
Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
02
Vessels; Containers; Shields associated therewith; Vacuum locks
Applicants: ASAHI GLASS CO LTD
旭硝子株式会社
Inventors: NISHIZAWA MANABU
西沢 学
KASE JUNICHIRO
加瀬 準一郎
SAITO KENTA
齊藤 健太
MAEDA TAKASHI
前田 敬
MATSUMOTO SHUJI
松本 修治
Agents: 渡辺 望稔
三和 晴子
Priority Data: 2005197528 06.07.2005 JP
Title: (EN) MANUFACTURING METHOD OF ALKALI-FREE GLASS AND ALKALI-FREE GLASS PLATE
(JA) 無アルカリガラスの製造方法および無アルカリガラス板
Abstract:
(EN) PROBLEM TO BE SOLVED: To provide a manufacturing method of alkali-free glass of a low bubble content suitable for a glass substrate for a flat panel display.

SOLUTION: In this manufacturing method of the alkali-free glass, a raw material is prepared by regulating the content of SnO2 to 0.01-2.0 mass% relative to 100 mass% of the total of the mother composition, which composition being shown below, and after heating and melting the raw material at 1,500-1,650C, in the state of a melt glass of 1,300-1,500C, oxygen bubbles generating at the interface of the molten glass and the platinum member are absorbed by oxidation of the SnO to SnO2. The composition in mass% of the mother composition is 58.4-66.0% SiO2, 15.3-22.0% Al2O3, 5.0-12.0% B2O3, 0-6.5% MgO, 0-7.0% CaO, 4-12.5% SrO. and 0-2.0% BaO, wherein (MgO+CaO+SrO+BaO) is 9.0-18.0%.

COPYRIGHT: (C)2007,JPO&INPIT
(JA)

【課題】フラットパネルディスプレイ用ガラス基板に適した泡の少ない無アルカリガラス製造方法を提供する。
【解決手段】以下の組成を母組成とし、質量百分率表示で、該母組成の総量100%に対し、SnOを0.01〜2.0%含むように原料を調製し、該原料を1500〜1650℃で加熱溶解した後、該溶融ガラスが1300〜1500℃にある状態で、該溶融ガラスと該白金部材との界面に発生する酸素泡を、該SnOのSnOへの酸化反応により吸収させる無アルカリガラスの製造方法。 質量百分率表示による組成: SiO:58.4〜66.0%、Al:15.3〜22.0%、B :5.0〜12.0%、MgO:0〜6.5%、CaO:0〜7.0%、SrO :4〜12.5%、BaO:0〜2.0%、 (MgO+CaO+SrO+BaO):9.0〜18.0%
【選択図】なし


Also published as:
KR1020080022575EP1911725US20080127679CN101213148WO/2007/004683