JPS5659642A - Cover glass for pocket watch - Google Patents

Cover glass for pocket watch

Info

Publication number
JPS5659642A
JPS5659642A JP13382179A JP13382179A JPS5659642A JP S5659642 A JPS5659642 A JP S5659642A JP 13382179 A JP13382179 A JP 13382179A JP 13382179 A JP13382179 A JP 13382179A JP S5659642 A JPS5659642 A JP S5659642A
Authority
JP
Japan
Prior art keywords
cover glass
glass
cao
mgo
sio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP13382179A
Other languages
Japanese (ja)
Other versions
JPS6025375B2 (en
Inventor
Takeshi Ito
Kijuro Hayano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HAMASAWA KOGYO KK
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
HAMASAWA KOGYO KK
Seiko Epson Corp
Suwa Seikosha KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HAMASAWA KOGYO KK, Seiko Epson Corp, Suwa Seikosha KK filed Critical HAMASAWA KOGYO KK
Priority to JP13382179A priority Critical patent/JPS6025375B2/en
Publication of JPS5659642A publication Critical patent/JPS5659642A/en
Publication of JPS6025375B2 publication Critical patent/JPS6025375B2/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Surface Treatment Of Glass (AREA)
  • Glass Compositions (AREA)

Abstract

PURPOSE: To obtain the titled cover glass with superior strength, hardness, ultraviolet-ray absorbing properties and workability by bringing glass having a special composition consisting of SiO2, Na2O, CaO, Fe2O3, MgO, Al2O3 and SO3 into contact with a molten K salt to form a surface compressive stress layer.
CONSTITUTION: Glass having a composition consisting of, by weight 65W73% SiO2, 10W20% Na2O, 5W15% CaO, 0.05W0.2% Fe2O3, ≤5% MgO, ≤0.5% Al2O3 and ≤0.5% SO3 is dipped in a molten K salt such as KNO3 to form a surface compressive stress layer having 50W65kg/mm2 stress value and 10W20μ depth by ion exchange at 380W480°C for 1W5hr.
COPYRIGHT: (C)1981,JPO&Japio
JP13382179A 1979-10-17 1979-10-17 Cover glass for mobile watches Expired JPS6025375B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13382179A JPS6025375B2 (en) 1979-10-17 1979-10-17 Cover glass for mobile watches

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13382179A JPS6025375B2 (en) 1979-10-17 1979-10-17 Cover glass for mobile watches

Publications (2)

Publication Number Publication Date
JPS5659642A true JPS5659642A (en) 1981-05-23
JPS6025375B2 JPS6025375B2 (en) 1985-06-18

Family

ID=15113820

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13382179A Expired JPS6025375B2 (en) 1979-10-17 1979-10-17 Cover glass for mobile watches

Country Status (1)

Country Link
JP (1) JPS6025375B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996024560A1 (en) * 1995-02-10 1996-08-15 Asahi Glass Company Ltd. Scratch-resistant glass
WO1996024559A1 (en) * 1995-02-10 1996-08-15 Asahi Glass Company Ltd. Scratch-resistant glass

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996024560A1 (en) * 1995-02-10 1996-08-15 Asahi Glass Company Ltd. Scratch-resistant glass
WO1996024559A1 (en) * 1995-02-10 1996-08-15 Asahi Glass Company Ltd. Scratch-resistant glass
US5721181A (en) * 1995-02-10 1998-02-24 Asahi Glass Company Ltd. Abrasion resistant glass
US5741745A (en) * 1995-02-10 1998-04-21 Asahi Glass Company Ltd. Abrasion resistant glass

Also Published As

Publication number Publication date
JPS6025375B2 (en) 1985-06-18

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