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Process for producing cover glass for potable appliance

A technology for protective glass and portable equipment, applied in the field of protective glass for portable equipment, can solve the problems of increased Li ion concentration, difficult ion exchange, etc., and achieves the effect of small intensity unevenness and long life

Inactive Publication Date: 2014-05-07
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, it has been known in the past that if such a chemical strengthening treatment is performed, for example, Li ions eluted from the glass will accumulate in the molten salt, resulting in a gradual increase in the concentration of Li ions in the molten salt, making ion exchange difficult.

Method used

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  • Process for producing cover glass for potable appliance
  • Process for producing cover glass for potable appliance
  • Process for producing cover glass for potable appliance

Examples

Experimental program
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Effect test

Embodiment 1）

[0093] The cover glass for portable devices of this Example was manufactured through the following (1) glass plate cutting process process, (2) chemical strengthening process.

[0094] (1) Glass plate cutting process

[0095] First, a large-sized glass plate with a thickness of 0.5 mm made of aluminosilicate glass produced by the down-draw method or float method is cut to form a cover glass (substrate for cover glass) of a predetermined size (long side 10 cm x short side 5 cm). ). As this aluminosilicate glass, a glass containing SiO 2 : 58 to 75% by weight, Al 2 o 3 : 5 to 23% by weight, Li 2 O: 3 to 10% by weight, Na 2 O: 4 to 13% by weight, ZrO 2 : 5.5 to 15% by weight of glass for chemical strengthening. The cutting of this glass plate is performed by machining.

[0096] (2) Chemical strengthening process

[0097] Next, chemical strengthening is given to the said cover glass. Chemical fortification using potassium nitrate (KNO 3 ) as molten salt, and prepare to ...

Embodiment 2）

[0110] In the chemical strengthening process of Example 1, sodium phosphate (Na 3 PO 4 ) was used as an additive to be added to the molten salt solution, and a chemical strengthening process was implemented in the same manner as in Example 1 to manufacture cover glasses for portable devices (100 sheets).

Embodiment 3）

[0112] In the chemical strengthening process of Example 1, potassium sulfate (K 2 SO 4 ) was used as an additive to be added to the molten salt solution, and a chemical strengthening process was implemented in the same manner as in Example 1 to manufacture cover glasses for portable devices (100 sheets).

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Abstract

The invention provides a process for producing a cover glass for portable appliances. The process comprises an ion-exchange step in which a glass article of a lithium-containing composition is brought into contact with a salt melt that contains an alkali metal element having a larger ionic radius than lithium, which is contained in the glass, to thereby cause ion exchange between some of the lithium contained in the glass article and the alkali metal contained in the salt melt. At least one additive selected from the group consisting of NaF, KF, K3AlF6, Na2CO3, NaHCO3, K2CO3, KHCO3, Na2SO4, K2SO4, KAl(SO4)2, Na3PO4 and K3PO4 is added to the salt melt, and the ion-exchange step is conducted so that the additive is in a solid state.

Description

technical field [0001] This invention relates to the manufacturing method of the cover glass for portable devices used for portable devices, such as a mobile phone, PDA (handheld computer), and a portable game machine. Background technique [0002] In order to increase the strength of glass products, chemical strengthening treatment is usually carried out. The chemical strengthening treatment refers to: by bringing the molten chemical strengthening salt into contact with the glass product, the alkali metal element with a relatively large ionic radius in the chemical strengthening salt and the alkali metal element with a relatively small ionic radius in the glass are ionized. Exchange, soaking the above-mentioned alkali metal elements with large ionic radius on the surface of the glass product to cause compressive stress on the surface of the glass product. For example, when there are alkali metals such as Li, Na, and K in the glass, it is replaced by an alkali metal with a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00C03C3/083
CPCC03C21/002
Inventor 今井贡桥本和明杉原理
Owner HOYA CORP
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