Thermoplastic elastomer composition and molded articles made thereof

Abstract

The subject invention relates to a thermoplastic elastomer composition that contains a dynamically vulcanized thermoplastic elastomer (a) on the basis of a polypropylene polymer and an at least partly dynamically vulcanized rubber, a thermoplastic polyester block copolymer (b) and a compatibilizer (c). The rubber is preferably an EPDM or EPM copolymer. The thermoplastic polyester block copolymer is preferably a polyether ester block copolymer. The thermoplastic elastomer composition according to the invention for instance contains 20-80 parts (a), 80-20 parts (b), and 1-40 parts (c), the sum of the parts (a+b+c) being 100. The thermoplastic elastomer composition according to the invention also relates to molded articles that contains the thermoplastic elastomer composition.

1 . Thermoplastic elastomer composition, characterized in that the composition contains: 
 a. a dynamically vulcanized thermoplastic elastomer containing a polypropylene polymer and an at least partly dynamically vulcanized rubber    b. a thermoplastic polyester block copolymer    c. a compatibilizer.    
     
     
         2 . Thermoplastic elastomer composition according to  claim 1 , characterized in that the composition contains 20-80 parts (a), 80-20 parts (b) and 1-40 parts (c), the sum of the parts (a+b+c) being 100.  
     
     
         3 . Thermoplastic elastomer composition according to either of claims  1 - 2 , characterized in that the composition contains 30-70 parts (a), 70-30 parts (b) and 5-20 parts (c), the sum of parts (a+b+c) being 100.  
     
     
         4 . Thermoplastic elastomer composition according to  claim 1 , characterized in that the polypropylene polymer is a propylene homo- or copolymer.  
     
     
         5 . Thermoplastic elastomer composition according to  claim 1 , characterized in that the rubber is an EPDM or EPM copolymer.  
     
     
         6 . Thermoplastic elastomer composition according to  claim 1 , characterized in that the at least partly dynamically vulcanized rubber has a gel content that is higher than 80%.  
     
     
         7 . Thermoplastic elastomer composition according to  claim 6 , characterized in that the at least partly dynamically vulcanized rubber has a gel content that is higher than 95%.  
     
     
         8 . Thermoplastic elastomer composition according to  claim 1 , characterized in that the thermoplastic polyester block copolymer is a polyether ester block copolymer.  
     
     
         9 . Thermoplastic elastomer composition according to  claim 1 , characterized in that the compatibilizer is a functionalized polymer.  
     
     
         10 . Thermoplastic elastomer composition according to  claim 9 , characterized in that the functionalized polymer is an epoxy or acid functionalized polymer.  
     
     
         11 . Thermoplastic elastomer composition according to  claim 10 , characterized in that the epoxy functionalized polymer is an epoxy-functionalized olefin polymer.  
     
     
         12 . Molded article that contains the thermoplastic elastomer composition according to any one of claims  1 - 11 .  
     
     
         13 . Molded article comprising a substrate part and a part that comprises the thermoplastic elastomer composition according to any of claims  1 - 11  whereby the parts are being adhered.