Plastic composites and process for their manufacture

Abstract

Flat composites of plastic are manufactured by thermal adhesive bonding of at least two plastic parts which are heated at their surfaces and which comprise a base material coated with a plastic layer, wherein the Vicat softening point of the plastic of layer is 5 to 40° C. lower than that of the base material, wherein the base material has a thickness of 1 to 200 mm and the plastic layer has a thickness of 5 to 400 μm, and each of the parts is heated on the surfaces coated with the plastic layer and then welded under pressure.

1 . A process for manufacture of flat composites of plastic, comprising: 
 thermal adhesive bonding of at least two plastic parts which each independently comprise a base material coated with a plastic layer;    wherein each of said plastic parts is heated on their surfaces coated with said plastic layer, thereby providing heated parts;    wherein said heated parts are welded under pressure;    wherein a Vicat softening point of said plastic layer is 5 to 40° C. lower than that of said base material; and    wherein said base material has a thickness of 1 to 200 mm and said plastic layer has a thickness of 5 to 400 μm.    
     
     
         2 . The process according to  claim 1 , wherein said surfaces coated with said plastic layer are heated to a temperature of 5 to 30° C. above the Vicat softening point of said plastic layer.  
     
     
         3 . The process according to  claim 1 , wherein said heated parts are joined by rolling.  
     
     
         4 . The process according to  claim 3 , wherein said rolling is performed between a pair of rolls, in which at least one roll, with which the pressing force is exerted, is mounted movably; 
 wherein said rolling occurs at a feed speed of between 5 and 200 mm/s and with a pressing force of between 10 and 500 N.    
     
     
         5 . The process according to  claim 1 , wherein said plastic layer and said base material of said plastic parts are manufactured by coextrusion; and 
 wherein said plastic parts are joined to one another.    
     
     
         6 . The process according to  claim 1 , wherein said base material and said plastic layer comprise independently a polymethyl methacrylate plastic or a polycarbonate plastic.  
     
     
         7 . The process according to  claim 1 , wherein said plastic layer is applied to the base material in the form of a lacquer or by coextrusion with the base material.  
     
     
         8 - 27 . (Cancelled)