Improved angular brightness microprismatic retroreflective...

G - Physics – 02 – B

Patent

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G02B 5/12 (2006.01) G02B 5/124 (2006.01)

Patent

CA 2355369

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.

Cette invention se rapporte à un nouveau film ou revêtement rétroréfléchissant microprismatique, qui contient un polymère semi-cristallin transparent. Ce film ou revêtement rétroréfléchissant microprismatique offre une meilleure luminosité par rétroréflection à des angles d'incidence élevés et à des angles d'observation élevés. Des polymères aromatiques de vinyle syndiotactiques, notamment du polystyrène syndiotactique et des copolymères de celui-ci constituent des polymères semi-cristallins préférés, étant donné qu'ils offrent une bonne stabilité des dimensions et une bonne résistance à l'humidité et peuvent être rendus résistants aux U.V. Des matériaux de signalisation comprenant ces films rétroréfléchissants microprismatiques offrent des performances améliorées en situation d'éclairage et de visualisation hors angle dans la régulation du trafic et dans d'autres applications de signalisation.

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