Stock material or miscellaneous articles – Composite – Of polycarbonate
Patent
1996-05-21
1997-02-25
Sellers, Robert E.
Stock material or miscellaneous articles
Composite
Of polycarbonate
428325, 428420, 524 87, 524 99, 524100, 524304, 359546, 359534, 359536, B32B 2736
Patent
active
056057610
ABSTRACT:
An article exhibiting durable fluorescent properties comprising a polymeric matrix, dye, and hindered amine light stabilizer, wherein the polymeric matrix is comprised of polycarbonate and the dye is comprised of a dye selected from the group consisting essentially of thioxanthone, perylene imide and/or thioindigoid compounds. The article exhibits durable fluorescence which resists degradation by ultraviolet or visible radiation. The invention is optionally combined with retroreflective elements so that the resultant article has durable fluorescent properties when exposed to sunlight and is also retroreflective. A method of manufacturing an article exhibiting durable fluorescent properties is also disclosed along with a method of increasing the durability of polycarbonate in a dyed system.
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Burns David M.
Pavelka Lee A.
Griswold Gary L.
Gulakowski Randy
Jordan Robert H.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
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