Trim for motor vehicle glazing systems

Abstract

The invention relates to trims for motor vehicle glazing systems, comprising a base layer and a coating and having glass-like optical properties at least in some subsections, composites consisting of such trims for motor vehicle glazing systems, and car body parts, as well as preferred embodiments which comprise suitable combinations of materials. Said trims comprising, at least towards the front side thereof, an edge rounding having a variable radius which allows a more uniform layer thickness for the coating.

1 .- 15 . (canceled) 
     
     
         16 . A bezel for motor vehicle glazing systems, comprising a base layer based on a thermoplastic, with a front side and a reverse side, and also sides connecting the front side and the reverse side, wherein the bezel has a coating on the front side, wherein the edges between the sides connecting the front side and the reverse side of the base layer and the front side of the base layer have been rounded, wherein the rounding has a radius that is variable across the rounding and wherein the bezel has a coating in the rounded edge region of the front side. 
     
     
         17 . The bezel as claimed in  claim 16 , wherein, in relation to the reverse side and the front side of the bezel, the bezel is U-shaped, O-shaped, double-O-shaped, T-shaped or I-shaped. 
     
     
         18 . The bezel as claimed in  claim 16 , wherein the edges between the sides connecting the front side and the reverse side of the base layer and the reverse side of the base layer have been rounded. 
     
     
         19 . The bezel as claimed in  claim 18 , wherein the bezel has a coating on the reverse side. 
     
     
         20 . The bezel as claimed in  claim 16 , wherein at least the rounding of the edges between the sides connecting the front side and the reverse side of the base layer and the front side of the base layer has the shape of, or approximately the shape of, a Bezier curve. 
     
     
         21 . The bezel as claimed in  claim 20 , wherein the Bezier curve is quadratic or cubic. 
     
     
         22 . The bezel as claimed in  claim 16 , wherein the bezel is U-shaped, O-shaped, double-O-shaped or T-shaped, where at least one internal angle R 1  situated between two legs of the bezel has been rounded, where the internal angle R 1  describes, precisely or approximately, a quadrant. 
     
     
         23 . The bezel as claimed in  claim 22 , wherein the radius of the quadrant is at least 10 mm. 
     
     
         24 . The bezel as claimed in  claim 16 , wherein the width b of the region between the outermost point P at the rounded edge of the bezel and the point E at the transition between the rounded region and a surface without curvature is at least 2.5 mm. 
     
     
         25 . The bezel as claimed in  claim 16 , wherein the wall thickness of the bezel is from 1.5 mm to 5 mm. 
     
     
         26 . The bezel as claimed in  claim 16 , wherein the bezel comprises a plurality of layers of which one is a base layer comprising polycarbonate, optionally carbon black, and a mold-release agent based on a fatty acid ester, and where there is, on at least one side of the base layer, a polysiloxane-based scratch-resistant coating comprising at least one UV absorber. 
     
     
         27 . The bezel as claimed in  claim 26 , wherein carbon black present comprises nanoscale carbon black with average primary particle size less than 100 nm, determined by scanning electron microscopy. 
     
     
         28 . The bezel as claimed in  claim 16 , wherein the bezel has, on the reverse side, a rib which, in relation to the cross section of the bezel, is in the region of the edge rounding between the sides connecting the front side and the reverse side of the base layer and the front side of the base layer. 
     
     
         29 . A compound-structure system comprising bodywork of a motor vehicle and comprising a bezel as claimed in  claim 16 . 
     
     
         30 . A process for the production of a bezel as claimed in  claim 16 , comprising the following steps:
 closure of the injection mold,   injection of a first polymer composition, preferably by way of injection-compression molding or cascade injection molding, then cooling to a maximal component temperature lower than the glass transition temperature of the first polymer composition,   optionally moving of the cavity into the next position or use of a mold with a larger cavity for purposes of injection of a second polymer composition, in such a way that on closure of the mold in this position an intervening space is produced between the first hardened polymer composition and the mold wall,   optional injection of the second polymer composition, then cooling to a maximal component temperature lower than the glass transition temperature of the second polymer composition,   coating of the bezel.