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Assignee3M Innovative Properties Company
InventorsKenneth L. Smith, Jaime R. Ojeda, Ronald J. Tabar
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A novel microprismatic retroreflective film or sheeting is provided which comprises a transparent semicrystalline polymer. The microprismatic retroreflective film or sheeting of the present invention offers superior retroreflective brightness at large angles of incidence and at large observational angles. Syndiotactic vinyl aromatic polymers, especially syndiotactic polystyrene and copolymers thereof, are preferred semicrystalline polymers, as they impart good dimensional stability and resistance to moisture, and can be made resistant to UV radiation. Signing materials comprising these microprismatic retroreflective films provide improved performance for off-angle illumination and viewing in traffic control and other signing applications.
A transparent retroreflective film comprising a polymer having an ordered array of integrally formed, interconnected, retroreflecting elements of substantially common shape said film, redirects light towards its originating source with high efficiency due to total internal reflection of light falling on the retroreflecting elements, wherein the film comprises:
Dependencies are inferred from the claim text.