Angular brightness microprismatic retroreflective film or sheeting incorporating a syndiotactic vinyl aromatic polymer
First Claim
1. 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:
- a syndiotatic polymer derived from a vinyl aromatic monomer to provide the polymer of the retroreflective film, wherein the film has a retroreflective surface having cube-cornered geometry.
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Abstract
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.
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Citations
17 Claims
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1. 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:
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a syndiotatic polymer derived from a vinyl aromatic monomer to provide the polymer of the retroreflective film, wherein the film has a retroreflective surface having cube-cornered geometry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification