Abstract: The invention relates to a molding composition which is embodied as a molding composition, a thus produced molded body as a molded body, and a method for producing said molded body comprising a surface structure.

Abstract: A security device, which is suitable in particular for improving the anti-forgery security of payment means, wherein the security device comprises a flat light reflection element. Several three-dimensional diffractive surface elements are arranged on a surface of the light reflection element. The surface elements comprise a diffraction grating on a light outlet surface. The diffraction gratings of a group of light surface elements are designed and/or arranged in such a way that an asterism is produced for an observer and/or an examination device.

Abstract: The invention relates to a molded part and to a process for producing such molded part with a surface structure. In particular, the invention relates to a transparent molded part comprising a sheet-like substrate and, provided on a major surface of said substrate, a layer having a layer thickness within a range of from 3 to 300 ?m and consisting of a solvent-free polymerized composition containing: a) from 35 to 75% by weight of at least one partially fluorinated acrylate; b) from 24.9 to 60% by weight of at least one non-fluorinated acrylate; and c) from 0.1 to 5% by weight of at least one photoinitiator; wherein said layer has a surface structure with diffractive surface elements having a maximum structural size of defects of such surface elements of up to 100 nm on the surface facing away from the substrate, characterized in that said composition contains luminescent pigments.

Abstract: A flat screen comprises a liquid-crystal element, such as an LCD element, for representing an image. Further, a plurality of point light sources, such as LEDs, are provided. Between the point light sources and the liquid-crystal element a light-guiding element is arranged. For rendering the brightness distribution more uniform, the light-guiding element comprises at a surface thereof a plurality of diffractive surface elements arranged in cells.

Abstract: The invention relates to a molding composition which is embodied as a molding composition, a thus produced molded body as a molded body, and a method for producing said molded body comprising a surface structure.

Abstract: A flat screen comprises a liquid-crystal element, such as an LCD element, for representing an image. Further, a plurality of point light sources, such as LEDs, are provided. Between the point light sources and the liquid-crystal element a light-guiding element is arranged. For rendering the brightness distribution more uniform, the light-guiding element comprises at a surface thereof a plurality of diffractive surface elements arranged in cells.

Abstract: A LED comprises a base body. The base body carries a light generating element. A light guide body is provided in the emitting direction of the light generating element. According to the invention, the light guide body comprises diffractive groups of light guide elements to fix the emission angle of the LED.