GB1078695A - Photochromic filter - Google Patents
Photochromic filterInfo
- Publication number
- GB1078695A GB1078695A GB3501764A GB3501764A GB1078695A GB 1078695 A GB1078695 A GB 1078695A GB 3501764 A GB3501764 A GB 3501764A GB 3501764 A GB3501764 A GB 3501764A GB 1078695 A GB1078695 A GB 1078695A
- Authority
- GB
- United Kingdom
- Prior art keywords
- photochromic
- triplet
- photochromic material
- free
- meta
- 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
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C1/00—Photosensitive materials
- G03C1/72—Photosensitive compositions not covered by the groups G03C1/005 - G03C1/705
- G03C1/73—Photosensitive compositions not covered by the groups G03C1/005 - G03C1/705 containing organic compounds
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
- G02B5/23—Photochromic filters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Optics & Photonics (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
A solid photochromic material comprises a polymeric base containing at least one photochromic material with a polynuclear conjugated condensed aromatic ring system, which is excitable by photons of energy greater than that equivalent to a wavelength of 6000 <\>rA to a meta-stable state, the meta-stable state having strongly-allowed triplet-triplet transitions to higher-energy states, the energy gaps of these transitions corresponding to wavelengths of 41,000-7,500 <\>rA. The triplet state is defined as that of a molecule containing two unpaired electrons with parallel spins. Two photochromic materials may be used, giving a synergistic effect. The material may be used as the middle layer in a filter with glass filters respectively opaque to I.-N. and U.-V. on each side, and the glass layers may be sealed to prevent ingress of oxygen to the photochromic material. 25 examples are given, together with a large number of applications. Photochromic materials mentioned include pyrazine, benzamide, 2-bromo-naphthalene, naphthalene, 1,10-phenantaroline, thianthrene, biphenyl, fluorene, benzophenone, benzophenone oxime, anthracene, triphenylene and chrysene, and may contain phosphorus or arsenic. Numerous polymeric base materials are mentioned, which should be substantially free from monomer and active centres capable of reacting with free radicals and bi-radicals, and free of oxygen.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US33292163A | 1963-12-23 | 1963-12-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1078695A true GB1078695A (en) | 1967-08-09 |
Family
ID=23300448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3501764A Expired GB1078695A (en) | 1963-12-23 | 1964-08-26 | Photochromic filter |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE664376A (en) |
| DE (1) | DE1292880B (en) |
| GB (1) | GB1078695A (en) |
| NL (1) | NL6407696A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2064039A1 (en) * | 1969-04-10 | 1971-07-16 | American Optical Corp |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5339036B2 (en) * | 1973-10-29 | 1978-10-19 | ||
| US4166043A (en) * | 1974-12-23 | 1979-08-28 | American Optical Corporation | Stabilized photochromic materials |
-
1964
- 1964-07-07 NL NL6407696A patent/NL6407696A/xx unknown
- 1964-08-26 GB GB3501764A patent/GB1078695A/en not_active Expired
- 1964-12-18 DE DE1964A0047933 patent/DE1292880B/en active Pending
-
1965
- 1965-05-24 BE BE664376D patent/BE664376A/xx unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2064039A1 (en) * | 1969-04-10 | 1971-07-16 | American Optical Corp |
Also Published As
| Publication number | Publication date |
|---|---|
| NL6407696A (en) | 1965-06-24 |
| BE664376A (en) | 1965-11-24 |
| DE1292880B (en) | 1969-04-17 |
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