Glass plate for substrate

A technology for glass plates and substrates, applied in the field of glass plates for substrates, which can solve the problems of difficulty in reducing the thermal expansion coefficient of glass substrates, difficulty in suppressing the rise of viscosity, and easy scratches of alkali glass substrates, and achieves excellent productivity, less dimensional changes, and is not easy to produce a biased effect

Inactive Publication Date: 2012-04-11
AGC INC
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  • Abstract
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  • Application Information

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Problems solved by technology

[0009] However, when B 2 o 3 When the content rate is low, and when it is not substantially contained, it is difficult to reduce the thermal expansion coefficient to a glass substrate for LCD panels.
Furthermore, it is also difficult to suppress the increase in viscosity and obtain a predetermined Tg, etc.
In addition, B 2 o 3 The content rate is low, and substantially does not contain B 2 o 3 The alkali glass substrate also has the problem of easy scratching

Method used

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Examples

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Embodiment

[0096] Next, although an Example and a comparative example demonstrate this invention more concretely, this invention is not limitedly interpreted as a following example.

[0097] According to the target composition expressed in mass % in the table (SiO 2 ~K 2 O) The raw materials of each component were prepared, heated and melted at a temperature of 1500-1600°C for 3 hours using a platinum crucible. During melting, a platinum stirrer was inserted and stirred for 1 hour to homogenize the glass. Next, the molten glass is flowed out, formed into a plate shape, and cooled gradually.

[0098] In addition, Examples 1 to 7 are examples, and Examples 8 to 9 are comparative examples.

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Abstract

Disclosed is a glass plate for a substrate, which does not contain B2O3 and can be used as a glass plate for an LCD panel. Specifically disclosed is a glass plate for a substrate, which does not substantially contain B2O3 and has a glass matrix composition containing, in mass% based on oxides, 68-80 of SiO2, 0.1-5 of Al2O3, 9.5-12 of MgO, 0-2 of CaO + SrO + BaO and 12.5-15.5 of Na2O + K2O. The glass plate for a substrate has a density of not more than 2.5 g / cm3, an average thermal expansion coefficient in the temperature range of 50-350 DEG C of more than 75 10-7 / DEG C but 87 10-7 / DEG C or less, a glass transition temperature of not less than 560 DEG C, and a brittleness of not more than 6.5 [mu]m-1 / 2.

Description

technical field [0001] The present invention relates to a glass plate for a substrate used in various display panels such as liquid crystal display (LCD) panels and plasma display panels (PDP), and substrates for solar cells. The glass plate for substrates of the present invention is particularly suitable as a glass plate for LCD panels. Background technique [0002] Conventionally, alkali-free glass that does not contain alkali metal oxides has been used as a glass substrate for LCD panels. The reason is that when the glass substrate contains an alkali metal oxide, the alkali ions in the glass substrate diffuse into the semiconductor film of the thin-film transistor (TFT) used for driving the LCD panel during the heat treatment in the LCD panel manufacturing process. , there is a possibility of deteriorating TFT characteristics. [0003] In addition, alkali-free glass has a low coefficient of thermal expansion and a high glass transition point (Tg), so there is little dim...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C03C3/085C03C3/087C03C3/091
CPCC03C3/087C03C3/091C03C3/085
Inventor西泽学岛田勇也加濑准一郎
OwnerAGC INC