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FR2323648A2 - Glass compsns. for joining to photochromic glass - for use in mfr. of ophthalmic lenses - Google Patents

Glass compsns. for joining to photochromic glass - for use in mfr. of ophthalmic lenses

Info

Publication number
FR2323648A2
FR2323648A2 FR7528072A FR7528072A FR2323648A2 FR 2323648 A2 FR2323648 A2 FR 2323648A2 FR 7528072 A FR7528072 A FR 7528072A FR 7528072 A FR7528072 A FR 7528072A FR 2323648 A2 FR2323648 A2 FR 2323648A2
Authority
FR
France
Prior art keywords
compsns
glass
degrees
photochromic
ophthalmic lenses
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
FR7528072A
Other languages
French (fr)
Other versions
FR2323648B2 (en
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.)
Corning Glass Works
Original Assignee
Corning Glass Works
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 Corning Glass Works filed Critical Corning Glass Works
Priority to FR7528072A priority Critical patent/FR2323648A2/en
Publication of FR2323648A2 publication Critical patent/FR2323648A2/en
Application granted granted Critical
Publication of FR2323648B2 publication Critical patent/FR2323648B2/fr
Granted 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
    • C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead
    • 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
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/07—Glass compositions containing silica with less than 40% silica by weight containing lead
    • C03C3/072—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron

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

Glass compsns. as described in the parent patent, are for segments or buttons to be joined to photochromic or phototropic glasses for producing multifocal ophthalmic lenses, the glass compsns. having a refractive index of 1.58-1.71, a softening temp. of 630-675 degrees C a steam point of 450-500 degrees C and a thermal expansion coefft. of 45-60 x 10-7/degrees C. These compsns. comprises o-8% Al2O3, 3-7% B2O3, 30-60% PbO and 30-55% SiO2. The refractive index of the new compsns. can be up to 1.75 while the softening temp. remains below 660 degrees C. The compsns. claimed comprise 28-50% SiO2, 1-10% B2O3, 2-9% Al2O3, 0-5% TiO2, 0-6% ZrO2 and 0-2% total of one or more of Ta2O5, Nb2O5, Gd2O3, Y2O3, WO3 and Bi2O3. Compsns. can be modified by addn. of 0-6% La2O3, 0-10% BaO, 0-3% Li2O and/or Na2O, 0-3% TiO2, the sum of which is not >10%. Good fusion is obtd. with a borosilicate photochromic glass.
FR7528072A 1975-09-12 1975-09-12 Glass compsns. for joining to photochromic glass - for use in mfr. of ophthalmic lenses Granted FR2323648A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7528072A FR2323648A2 (en) 1975-09-12 1975-09-12 Glass compsns. for joining to photochromic glass - for use in mfr. of ophthalmic lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7528072A FR2323648A2 (en) 1975-09-12 1975-09-12 Glass compsns. for joining to photochromic glass - for use in mfr. of ophthalmic lenses

Publications (2)

Publication Number Publication Date
FR2323648A2 true FR2323648A2 (en) 1977-04-08
FR2323648B2 FR2323648B2 (en) 1982-07-16

Family

ID=9159935

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7528072A Granted FR2323648A2 (en) 1975-09-12 1975-09-12 Glass compsns. for joining to photochromic glass - for use in mfr. of ophthalmic lenses

Country Status (1)

Country Link
FR (1) FR2323648A2 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2450792A1 (en) * 1979-03-09 1980-10-03 Corning Glass Works HIGH INDEX OPHTHALMIC LENSES
WO1990009356A1 (en) * 1989-02-07 1990-08-23 Canyon Materials Research & Engineering High energy sensitive photochromic glasses and method for making
EP0519174A1 (en) * 1991-06-17 1992-12-23 Corning Incorporated High index ophthalmic glasses
FR2746790A1 (en) * 1996-04-02 1997-10-03 Corning Inc High refractive index optical glasses
EP0891308A1 (en) * 1996-04-02 1999-01-20 Corning Incorporated Glasses with a high refractive index and their use as segments of multifocal corrective lenses
US6524756B1 (en) 1996-10-31 2003-02-25 Canyon Materials, Inc. Gray scale all-glass photomasks
US6562523B1 (en) 1996-10-31 2003-05-13 Canyon Materials, Inc. Direct write all-glass photomask blanks

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2450792A1 (en) * 1979-03-09 1980-10-03 Corning Glass Works HIGH INDEX OPHTHALMIC LENSES
WO1990009356A1 (en) * 1989-02-07 1990-08-23 Canyon Materials Research & Engineering High energy sensitive photochromic glasses and method for making
US5078771A (en) * 1989-02-07 1992-01-07 Canyon Materials, Inc. Method of making high energy beam sensitive glasses
EP0519174A1 (en) * 1991-06-17 1992-12-23 Corning Incorporated High index ophthalmic glasses
FR2746790A1 (en) * 1996-04-02 1997-10-03 Corning Inc High refractive index optical glasses
EP0891308A1 (en) * 1996-04-02 1999-01-20 Corning Incorporated Glasses with a high refractive index and their use as segments of multifocal corrective lenses
EP0891308A4 (en) * 1996-04-02 1999-07-28 Corning Inc Glasses with a high refractive index and their use as segments of multifocal corrective lenses
US6046123A (en) * 1996-04-02 2000-04-04 Corning S.A. Glasses with a high refractive index and their use as segments of multifocal corrective lenses
US6524756B1 (en) 1996-10-31 2003-02-25 Canyon Materials, Inc. Gray scale all-glass photomasks
US6562523B1 (en) 1996-10-31 2003-05-13 Canyon Materials, Inc. Direct write all-glass photomask blanks

Also Published As

Publication number Publication date
FR2323648B2 (en) 1982-07-16

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