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US 7,582,720 B2Granted
Light-scattering shaped articles of high light transmission and the use thereof in flat screens
AssigneeBayer Material Science AG
InventorsClaus Rüdiger, Michael Prein, Marco Roelofs, Jürgen Röhner, Tanja Grüter-Reetz
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Abstract
The present invention relates to a solid sheet prepared from a composition that includes: (a) a transparent polycarbonate; and (b) transparent polymeric particles having an optical density which differs from the transparent polycarbonate matrix material. The present invention also relates to use of such a solid sheet as a diffuser sheet in flat screens.
Claims8
A flat screen comprising a diffuser sheet, wherein said diffuser sheet comprises the solid sheet comprises a composition comprising:
- (a) 80 to 99.99 wt. %, based on the total weight of said composition, of a transparent polycarbonate having a light transmission according to ISO 13 468-2 (at 4 mm thickness) of more than 88.5% and having a refractive index;
- and
- (b) 0.01 to 20 wt. %, based on the total weight of said composition, of poly(meth)acrylate particles, said poly(meth)acrylate particles having,
- (i) a core/shell morphology,
- (ii) a particle size of from 1 and 100 μm, and
- (iii) a refractive index that is different that the refractive index of said transparent polycarbonate,
- wherein said composition is free of a coloring agent selected from the group consisting of anthanthrones, anthraquinones, benzimidazoles, diketopyrrolopyrroles, isoindolinols, perinones, perylenes, phthalocyanines, quinacridones, quinophthalones and combinations thereof.
4 more elements
Dependencies are inferred from the claim text.