Polycarbonate compositions having improved mechanical properties

Abstract

The invention relates to compositions containing at least one (co)polycarbonate stable at high temperature and at least one ethylene-alkyl acrylate block copolymer, and to mouldings and injection moulded parts and extrudates obtainable from these compositions.

1 . A polycarbonate composition comprising:
 A) from 82 to 99.5% by weight, based in each case on the sum of the parts by weight of the components A and B, of at least one polycarbonate having high heat distortion resistance and based on one or more cycloaliphatic bisphenols of Formula (1a)   
       
         
           
           
               
               
           
         
         
           wherein 
           R1 and R2 are, independently of one another, hydrogen, halogen, C 1 -C 8 -alkyl, C 5 -C 6 -cycloalkyl, phenyl, or C 7 -C 12 -aralkyl, 
           n is an integer from 4 to 7, 
           R3 and R4 are selectable for each X individually and are, independently of one another, hydrogen or C 1 -C 6 -alkyl, and 
           X is carbon, 
           with the proviso that, on at least one X, R3 and R4 simultaneously arealkyl; 
         
         and 
         B) from 0.5 to 18% by weight, based in each case on the sum of the parts by weight of the components A and B, of at least one ethylene-alkyl acrylate block copolymer. 
       
     
     
         2 . The polycarbonate composition of  claim 1 , wherein R1 and R2 are, independently of one another, chlorine, bromine, methyl, phenyl, or H, and n is 4 or 5. 
     
     
         3 . The polycarbonate composition of  claim 1 , wherein component A comprises a copolycarbonate of bisphenol A and bisphenol TMC. 
     
     
         4 . The polycarbonate composition of  claim 1 , wherein said composition contains from 89 to 99 parts by weight of component A and from 1 to 11 parts by weight of component B, based in each case on the sum of the parts by weight of the components A and B. 
     
     
         5 . The polycarbonate composition of  claim 1 , wherein said ethylene-alkyl (meth)acrylate block copolymer of component B is an ethylene-alkyl (meth)acrylate block copolymer of formula (4): 
       
         
           
           
               
               
           
         
         wherein 
         R 5  is methyl or hydrogen, 
         R 6  is hydrogen or a C 1  to C 12  alkyl radical, and 
         n and m are degrees of polymerization. 
       
     
     
         6 . The polycarbonate composition of  claim 5 , wherein R 6  is methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, tert-butyl, isobutyl, hexyl, isoamyl, or tert-amyl. 
     
     
         7 . The polycarbonate composition of  claim 5 , wherein the ratio of the degree of polymerization n to degree of polymerization m is in the range of from 1:300 to 90:10. 
     
     
         8 . The polycarbonate composition of  claim 1 , further comprising from 0 to 5 parts by weight, based on the sum of the parts by weight of the components A and B, of additives as component C. 
     
     
         9 . A shaped article, extrudate, film, or film laminate obtained from the polycarbonate composition of  claim 1 . 
     
     
         10 . A shaped article, extrudate, or film comprising coextrusion layers obtained from the polycarbonate composition of  claim 1 , wherein said at least one polycarbonate is a copolycarbonate. 
     
     
         11 . The shaped article, extrudate, film, or film laminate of  claim 10 , wherein said article, extrudate, film, or film laminate is a housing part of an electrical device or apparatus, a tool housing, a mobile telephone, a heating/ventilation panel, a tachometer disc, an instrument dial, a panel, a keyboard in an electrical or an electronic device, a lense, a screen/display cover, an LED application, or a film for an automobile seat. 
     
     
         12 . The housing part of an electrical device or apparatus of  claim 11 , wherein said electrical device or apparatus is a switch box. 
     
     
         13 . A process for preparing the polycarbonate composition of  claim 1  comprising the step of compounding one or more polycarbonates according to the phase boundary process.