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EVP 008905 e, December 2005 Page 22 of 27 <strong>Colorants</strong> for plastic colorations Suitability PVC-p PVC-u PUR PE-LD Lumogen ® F Yellow 083 Lumogen ® F Yellow 170 Lumogen ® F Orange 240 Lumogen ® G Pink 285 Lumogen ® F Red 305 Lumogen ® F Violet 570 Lumogen ® F Blue 650 suitable limited suitability, preliminary tests required not suitable PE-HD PP PS SB SAN The Lumogen ® F range comprises high-purity fluorescent dyes of polycyclic nature. They show a very brilliant fluorescence and have outstanding fastness properties. Fastness to weathering Specimen: injection-molded PMMA plaques, 2 mm thick, colored with 0.02 % dye; test condition and criteria: Xenotest ®11 1200 accelerated weathering according to DIN EN ISO 4892-2; remaining fluorescence (%) after 2,000 hours of exposure Lumogen ® Lumogen ® Lumogen ® Lumogen ® Lumogen ® ABS/ASA ABS PMMA PC PBT PA F Yellow 083 > 90 F Orange 240 > 85 F Red 305 > 95 F Violet 570 > 80 after 1,500 hours F Blue 650 > 80 after 1,500 hours The best-suited carrier material for Lumogen ® F dyes is PMMA if outdoor application is intended. Foreign substances contained in PMMA may decrease the fastness to weathering. Sheets made by casting from monomeric MMA usually contain small proportions of monomer and reaction initiator. In tests such material has shown to impair the resistance of weathering. When casting sheets, the temperature during curing must be checked carefully to fully avoid residues of monomers. This problem will not arise when PMMA thermo-forming material is used. In outdoor weathering, a decrease of fluorescence during summer has shown to recuperate to almost its original level during the darker winter season. 11 registered trademark of Xenotest Gesellschaft für die Herstellung von Materialprüfgeräten mbH PETP CA/CAB UP
EVP 008905 e, December 2005 Page 23 of 27 <strong>Colorants</strong> for plastic colorations Application The ability of fluorescent dyes to emit absorbed light at different wavelengths can be used to collect light. The fluorescent collector consists of a crystal-clear plastic sheet colored with a fluorescent dye. Within the sheet, total reflectance will divert fluorescent radiation to the borders of the sheet, from where the largest share is focused and emitted. Unlike systems of mirrors and lenses, the fluorescent collector will also concentrate diffused, undirected light. Use of the fluorescent collector is manifold: solar energy photo voltaics – by mounting solar cells to the edges of the collector, sufficient energy to operate small devices like watches, pocket computers, electrical displays, radios, recharging devices etc. can be produced. light engineering indirect illumination, fluorescence conversion, markings and warning devices, e. g., for road traffic (these are particularly effective in bad weather and at dawn), safety clothing, optical fibers for technical appliances advertising/design information signs, sports and leisure articles, toys, substitutes for luminescent tubes For these applications, fluorescent dyes must meet very high requirements: excellent fastness properties in certain polymers high luminance extremely high chroma good solubility in plastics high heat stability Lumogen ® F dyes meet these requirements to a great extent and conform to the specifications of the fluorescent collector. Lumogen ® F dyes can be used with all crystal-clear polymers. Migration or bleeding must be expected with polymers containing butadiene or plasticizers or in semi-crystalline polymers. Pre-trials are strongly recommended for these applications. Processing The dyestuff powder is distributed among the polymer powder, grit or granules in slow or quick mixers. Generally, the dyestuff powder will adhere to the polymer by electrostatic charge. Prior to further processing the mixture should be homogenized on an extruder. Dosage The concentration of dyestuff required depends on the thickness of the part to be colored. Normally, very low dosages of between 0.005 % and 0.02 % will suffice.
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Colorants

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