Patent ID: 9442237
Filing Date: 2016-09-13
CPC Classification: B29C,B29D,B29K,B29L,G02B

Claim Text:
1. A method for producing a methacrylate-based light guide body having a thickness of between 100 μm and 1 mm, the method comprising extruding a methacrylate-based material in an apparatus followed by smoothing, to produce a methacrylate-based light guide body, wherein the apparatus comprises the flat film nozzle comprises a nozzle lip comprising control elements for adjusting the nozzle lip width, said control elements having a mutual separation of from 11 to 15 mm, such that a nozzle body has an external geometry which is adapted to the shape of the smoothing rolls; a distance from a melt exit edge to a smoothing gap is 80 mm or less; and at least 95 wt % of the methacrylate-based light guide body consists of PMMA, and it does not contain any impact modifiers.