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GB1031893A - Transparent beads - Google Patents

Transparent beads

Info

Publication number
GB1031893A
GB1031893A GB1300863A GB1300863A GB1031893A GB 1031893 A GB1031893 A GB 1031893A GB 1300863 A GB1300863 A GB 1300863A GB 1300863 A GB1300863 A GB 1300863A GB 1031893 A GB1031893 A GB 1031893A
Authority
GB
United Kingdom
Prior art keywords
temperature
diameter
particles
transparent beads
glass
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
GB1300863A
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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
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 Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of GB1031893A publication Critical patent/GB1031893A/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
    • C03C23/00—Other surface treatment of glass not in the form of fibres or filaments
    • C03C23/007—Other surface treatment of glass not in the form of fibres or filaments by thermal treatment
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/12—Reflex reflectors
    • G02B5/126—Reflex reflectors including curved refracting surface
    • G02B5/128—Reflex reflectors including curved refracting surface transparent spheres being embedded in matrix

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Glass Compositions (AREA)

Abstract

In order to increase the refractive index of glass particles of less than 2 mm. in diameter, e.g. glass beads of 0.25 mm. in diameter, the composition contains at least 25% by weight of titanium dioxide and the particles are heated to a temperature between 450 DEG and 1100 DEG C. and at least 300 DEG C. below the liquidus temperature whereby an exothermic reaction occurs and raises the temperature a further 10-50 DEG C. to cause slight nucleation but insufficient to result in excessive crystallization.
GB1300863A 1962-04-02 1963-04-02 Transparent beads Expired GB1031893A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18454562A 1962-04-02 1962-04-02

Publications (1)

Publication Number Publication Date
GB1031893A true GB1031893A (en) 1966-06-02

Family

ID=22677347

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1300863A Expired GB1031893A (en) 1962-04-02 1963-04-02 Transparent beads

Country Status (1)

Country Link
GB (1) GB1031893A (en)

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