LIGHT-ACCUMULATING POLYMERIC LAYER Russian patent published in 2005 - IPC

FIELD: polymer materials.

SUBSTANCE: polymeric layer is made in the form of polydimethylsiloxane or polycarbonate-based film uniformly filled with luminophor mixture in amount 10 to 80%, which mixture contains ZnS·Co·Ni and/or ZnS·CsS·Cu·Co Ni and CeAl₂O₄·Eu·Dy. Weight ratio of zinc sulfide to aluminate luminophor ranges from 1:99 to 10:90. Molecular weights of polydimethylsiloxane and polycarbonate are more than 30000 and 30000-35000, respectively. Luminophor particle size is 10 to 60 mcm. Thickness of polymer film is ranges from 90 to 2000 mcm. In case of polycarbonate polymeric film, informational graphic symbols, marks, and text are applied onto surface of the film by offset print technique and, in case of polydimethylsiloxane film, by explication technique. Polymeric layer may be supported by light-reflecting carrier whose thickness id comparable with that of luminophor grains. Initial brightness and accumulated light are in excess as compared to prior art analogues.

EFFECT: increased strength, elasticity, resistance to mechanical and environmental effects, reduced cost, and prolonged after-excitation emission.

6 cl, 3 tbl