Compositions – Light transmission modifying compositions – Inorganic crystalline solid
Patent
1992-08-05
1993-10-26
Stoll, Robert L.
Compositions
Light transmission modifying compositions
Inorganic crystalline solid
252586, 430266, 430267, 430567, 430568, 359241, 359609, G02B 520, G02B 508, G03C 106
Patent
active
052563375
ABSTRACT:
A photochromic material adapted for coating light transmissive materials. The photochromic material contains photosensitive silver halide crystals having dimensions in the range of approximately 50 Angstroms to 800 Angstroms. The silver halide crystals are surface doped with copper ions and another sensitizer selected from mild reducing agents, thioethers, or sulfur-bearing ions and are treated with an agent to accelerate the forward reaction and control the reverse reaction. The accelerants are ions selected from the group consisting of cobalt, chromium, manganese, magnesium, and rare earth metals such as cerium, samarium and europium. The agent for controlling the reverse reaction is one that confers electrical conductivity on the material and while to this end glycerol containing a high concentration of metal ions, methane sulfonic acid and benzyltrimethyl ammonium chloride are useful, the preferred agent is phosphoric acid. The crystals are dispersed in one or more protective polymers that do not irreversibly bind halogen.
REFERENCES:
patent: 3772031 (1973-11-01), Berry
patent: 4046586 (1977-09-01), Uhlmann et al.
patent: 4049567 (1977-09-01), Chu et al.
patent: 4076542 (1978-02-01), Deeg et al.
patent: 4110244 (1978-08-01), Hovey
patent: 4431730 (1984-02-01), Urabe et al.
patent: 4550087 (1985-10-01), Kerko et al.
patent: 4844591 (1989-07-01), Arribart et al.
patent: 4933265 (1990-06-01), Inoue et al.
patent: 5015416 (1991-05-01), Reid
patent: 5073303 (1991-12-01), Reid
Do Pauline
Reid Jerome L.
Stoll Robert L.
Wu Shean C.
LandOfFree
Photochromic polymer membrane does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photochromic polymer membrane, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photochromic polymer membrane will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-956916