Compositions – Inorganic luminescent compositions – Tungsten containing
Patent
1975-12-22
1979-09-11
Lesmes, George F.
Compositions
Inorganic luminescent compositions
Tungsten containing
350 11, 260465D, 544171, 428219, 428480, F21V 900, G02B 522
Patent
active
041674901
ABSTRACT:
Flexible filters capable of transmitting radiation in the spectral range of 315 to 380 nm and absorbing radiation in the spectral range of 400 to 550 nm consist essentially of a thin flexible film, e.g., polyethylene terephthalate containing or having coated thereon a dye in a concentration of 15 to 60 mg/dm.sup.2 and optionally, as a component of the coating, a thermoplastic organic binder, e.g., cellulose acetate butyrate, present in the coating with the dye, said dye being of the formula: ##STR1## where R.sub.1 is lower alkyl of 1 to 5 carbon atoms; R.sub.2 and R.sub.3, which may be the same or different, are selected from the group consisting of R.sub.1, 2-cyanoethyl, 2-hydroxyethyl and ##STR2## or form a saturated 5- or 6- membered ring; R.sub.4 is taken from the class consisting of lower alkyl of 1 to 5 carbon atoms, aryl or alkaryl of 6 to 9 carbon atoms, and aralkyl. The filters are useful in exposing dual response photosensitive materials with ultraviolet radiation sources which contain appreciable quantities of visible radiation.
REFERENCES:
patent: 2627088 (1953-02-01), Alles et al.
patent: 2779684 (1957-01-01), Alles
patent: 2803640 (1957-08-01), Heckert
patent: 3382183 (1968-05-01), Donoian et al.
patent: 3390994 (1968-07-01), Cescon
patent: 3390996 (1968-07-01), MacLachlan
patent: 3813255 (1974-05-01), Mannens et al.
patent: 3874876 (1975-04-01), Hibino et al.
patent: 3906510 (1975-09-01), Hattori et al.
patent: 3914024 (1975-10-01), Tanabe et al.
patent: 3918976 (1975-11-01), Arai et al.
patent: 3984246 (1976-10-01), Ohlschlager
E. I. DuPont de Nemours and Company
Lesmes George F.
Varndell, Jr. R. Eugene
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