RETROREFLECTIVE SHEET, LICENSE PLATE, AND MANUFACTURING METHOD THEREOF

RETROREFLECTIVE SHEET, LICENSE PLATE, AND MANUFACTURING METHOD THEREOF

The disclosed retroreflective sheet contains a retroreflective layer and a polyurethane surface protecting layer, wherein the surface protecting layer contains at least a reaction product of a polyol with either a polyester backbone or a polycarbonate backbone and a trifunctional or higher aliphatic...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Ueda Saori, Nakajima Toshitaka, Takamatsu Yorinobu, Saito Koji, Egashira Ken
Format: Patent
Sprache:eng
Schlagworte:
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PERFORMING OPERATIONS
PHYSICS
TRANSPORTING
VEHICLES IN GENERAL
VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR
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Beschreibung
Zusammenfassung:The disclosed retroreflective sheet contains a retroreflective layer and a polyurethane surface protecting layer, wherein the surface protecting layer contains at least a reaction product of a polyol with either a polyester backbone or a polycarbonate backbone and a trifunctional or higher aliphatic isocyanate, and the glass transition temperature Tg of the surface protecting layer is 50° C. or higher, and the tan δ of the loss tangent at 120° C. is 0.1 or less.