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.

Abstract: A composition, which when mixed with water, is capable of providing a colorant solution for coloring natural casings, comprising an effective amount of at least one antioxidant, an effective amount of a preservative capable of minimizing the deterioration of the casing, and a dye system for coloring the casing.