Angular brightness microprismatic retroreflective film or sheeting incorporating a syndiotactic vinyl aromatic polymer
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United States of America Patent
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Aug 14, 2001
Grant Date -
Jul 19, 2001
app pub date -
Jan 29, 1999
filing date -
Jan 29, 1999
priority date (Note) -
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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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