GB1252649A - - Google Patents

Info

Publication number
GB1252649A
GB1252649A GB1252649DA GB1252649A GB 1252649 A GB1252649 A GB 1252649A GB 1252649D A GB1252649D A GB 1252649DA GB 1252649 A GB1252649 A GB 1252649A
Authority
GB
United Kingdom
Prior art keywords
silver
phototropic
glass
melt
chilling
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.)
Expired
Application number
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 filed Critical
Publication of GB1252649A publication Critical patent/GB1252649A/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
    • C03C4/00—Compositions for glass with special properties
    • C03C4/04—Compositions for glass with special properties for photosensitive glass
    • C03C4/06—Compositions for glass with special properties for photosensitive glass for phototropic or photochromic glass

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)
  • Glass Compositions (AREA)

Abstract

1,252,649. Phototropic glasses. CORNING GLASS WORKS. 4 March, 1969, No.11369/69. Heading C1M. Transparent photochromic (phototropic) glass having a high optical density when present in thin cross-section is produced by: (a) melting a batch consisting of (in weight per cent) 40-76 SiO 2 ; 4-26 B 2 O 3 ; 4-26 Al 2 O 3 ; at least one alkali metal oxide taken from the following in the proportion indicated, that is: 2-8 Li 2 O, 4-15 Na 2 O, 6-20 K 2 O, 8-25 Rb 2 O, 10-30 Cs 2 O; silver in a content of greater than 0À7 %; at least one halogen selected from Cl, Br and I, the total halogen being greater than 0À6%; the sum of the recited constituents being at least 85% of the total glass composition and the balance, if any consisting of other compatible constituents; and (b) simultaneously chilling the melt sufficiently rapidly to a temperature below the transformation range to prevent growth of large silver halide crystals and shaping an article therefrom having a thickness not above 0À02 inch. The chilling occurs in less than 5 seconds, and may be performed by drawing the melt through metal rollers to form a sheet. The silver and halogens contents preferably do not exceed 1À5 and 2% respectively.
GB1252649D 1969-03-04 1969-03-04 Expired GB1252649A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1136969 1969-03-04

Publications (1)

Publication Number Publication Date
GB1252649A true GB1252649A (en) 1971-11-10

Family

ID=9984983

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1252649D Expired GB1252649A (en) 1969-03-04 1969-03-04

Country Status (1)

Country Link
GB (1) GB1252649A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018965A (en) * 1975-04-14 1977-04-19 Corning Glass Works Photochromic sheet glass compositions and articles
US20150099130A1 (en) * 2013-10-09 2015-04-09 Corning Incorporated Reverse photochromic borosilicate glasses

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018965A (en) * 1975-04-14 1977-04-19 Corning Glass Works Photochromic sheet glass compositions and articles
US20150099130A1 (en) * 2013-10-09 2015-04-09 Corning Incorporated Reverse photochromic borosilicate glasses
CN105813998A (en) * 2013-10-09 2016-07-27 康宁股份有限公司 Reverse photochromic borosilicate glasses
JP2016535715A (en) * 2013-10-09 2016-11-17 コーニング インコーポレイテッド Reverse photochromic borosilicate glass
US9527769B2 (en) * 2013-10-09 2016-12-27 Corning Incorporated Reverse photochromic borosilicate glasses
US20170050878A1 (en) * 2013-10-09 2017-02-23 Corning Incorporated Reverse photochromic borosilicate glasses
CN105813998B (en) * 2013-10-09 2018-12-07 康宁股份有限公司 Reversed photochromic borosilicate glass
US10487003B2 (en) 2013-10-09 2019-11-26 Corning Incorporated Reverse photochromic borosilicate glasses

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Legal Events

Date Code Title Description
PS Patent sealed
PLE Entries relating assignments, transmissions, licences in the register of patents
PLNP Patent lapsed through nonpayment of renewal fees