FR2217707A1 - photochromic sunglasses - stable and efficient, contg a photochromic cpd in an epoxy resin - Google Patents

photochromic sunglasses - stable and efficient, contg a photochromic cpd in an epoxy resin

Info

Publication number
FR2217707A1
FR2217707A1 FR7304761A FR7304761A FR2217707A1 FR 2217707 A1 FR2217707 A1 FR 2217707A1 FR 7304761 A FR7304761 A FR 7304761A FR 7304761 A FR7304761 A FR 7304761A FR 2217707 A1 FR2217707 A1 FR 2217707A1
Authority
FR
France
Prior art keywords
photochromic
contg
cpd
efficient
stable
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
FR7304761A
Other languages
French (fr)
Other versions
FR2217707B1 (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.)
Wyeth Holdings LLC
Original Assignee
American Cyanamid 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 American Cyanamid Co filed Critical American Cyanamid Co
Priority to FR7304761A priority Critical patent/FR2217707A1/en
Publication of FR2217707A1 publication Critical patent/FR2217707A1/en
Application granted granted Critical
Publication of FR2217707B1 publication Critical patent/FR2217707B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/10—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
    • G02C7/102—Photochromic filters

Abstract

Filter contains a photochromic substance (A) carrying a conjugated polynuclear aromatic ring system having a series of metastable electronic energy levels (I) such that (a) the transitions from these to higher states are very favourable, and whose photons in the visible range of energies, (b) the levels I are populated so as to give a redistribution of electrons such that the electronic configuration of the fundamental state is transformed to that of the metastable state when the molecule is excited by 300-400 nm. photons, (c) the molecules in the metastable state do not complete strongly for the solar U.V. rays.
FR7304761A 1973-02-09 1973-02-09 photochromic sunglasses - stable and efficient, contg a photochromic cpd in an epoxy resin Granted FR2217707A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7304761A FR2217707A1 (en) 1973-02-09 1973-02-09 photochromic sunglasses - stable and efficient, contg a photochromic cpd in an epoxy resin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7304761A FR2217707A1 (en) 1973-02-09 1973-02-09 photochromic sunglasses - stable and efficient, contg a photochromic cpd in an epoxy resin

Publications (2)

Publication Number Publication Date
FR2217707A1 true FR2217707A1 (en) 1974-09-06
FR2217707B1 FR2217707B1 (en) 1976-11-05

Family

ID=9114640

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7304761A Granted FR2217707A1 (en) 1973-02-09 1973-02-09 photochromic sunglasses - stable and efficient, contg a photochromic cpd in an epoxy resin

Country Status (1)

Country Link
FR (1) FR2217707A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1406753A (en) * 1963-12-23 1965-07-23 American Cyanamid Co New photochromic filters
FR1449287A (en) * 1964-10-30 1966-08-12 American Cyanamid Co New photochromic filter
FR1554269A (en) * 1967-02-10 1969-01-17
US3475507A (en) * 1967-10-13 1969-10-28 American Cyanamid Co Method of producing labeled polynuclear compounds
FR1584280A (en) * 1968-05-16 1969-12-19

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1406753A (en) * 1963-12-23 1965-07-23 American Cyanamid Co New photochromic filters
FR1449287A (en) * 1964-10-30 1966-08-12 American Cyanamid Co New photochromic filter
FR1554269A (en) * 1967-02-10 1969-01-17
US3475507A (en) * 1967-10-13 1969-10-28 American Cyanamid Co Method of producing labeled polynuclear compounds
FR1584280A (en) * 1968-05-16 1969-12-19

Also Published As

Publication number Publication date
FR2217707B1 (en) 1976-11-05

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Legal Events

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