Patent ID: 6911486

Claim:
Encapsulated type fluorescent retroreflective sheeting which comprises a surface-protective layer disposed on the side on which light is to strike, a binder layer connected to the surface-protective layer through network bonding parts, an air layer which is sealed-up by the network bonding parts between the surface-protective layer and the binder layer, and a retroreflective element layer disposed between the surface-protective layer and the air layer, or between the binder layer and the air layer, wherein at least one layer located on the light-incident side of sealed-up air layer contains at least one fluorescent dye selected from the group consisting of benzimidazole coumarin type-fluorescent dyes of formula (1) as follows: wherein R 1 and R 2 each denote hydrogen atom, alkyl group, allyl group, cycloalkyl group, cyclohexylphenyl group or alkylphenyl group; and R 3 and R 4 each denote hydrogen atom, halogen atom, alkyl group or alkoxy group, and benzopyran type-fluorescent dyes of formula (2) as follows: wherein Y 1 and Y 2 each denote hydrogen atom, cyano group, alkyl group, alkoxy group, allyl group, allyloxy group, carboalkoxy group, acetoxy-substituted alkyl group, cycloalkyl group or phenyl group; and Y 3 and Y 4 each denote hydrogen atom, halogen atom, alkoxy group, cyano group or nitro group.