Propylene-based compositions comprising carbon fibers and a thermoplastic polyolefin elastomer

Abstract

The present disclosure relates to a composition comprising: (A) from 30 wt % to 94 wt % of a propylene component including at least one propylene-based polymer having a propylene content of at least 75 wt %, based on the total weight of the propylene-based polymer, and a melt flow rate of at least 10 g/10 minutes as measured by ISO 1133 at 230 C/2.16 kg; (B) from 1 wt % to 50 wt % of a carbon fiber component; (C) from 5 wt % to 69 wt % of a thermoplastic polyolefin elastomer; and, optionally, (D) from 0.1 wt % to 15 wt % of a compatibilization agent.

1 . A composition comprising:
 (A) from 30 wt % to 94 wt % of a propylene component including at least one propylene-based polymer having a propylene content of at least 75 wt %, based on the total weight of the propylene-based polymer, and a melt flow rate of at least 10 g/10 minutes as measured by ISO 1133 at 230° C./2.16 kg;   (B) from 1 wt % to 50 wt % of a carbon fiber component; and   (C) from 5 wt % to 69 wt % of a thermoplastic polyolefin elastomer.   
     
     
         2 . The composition of  claim 1 , further comprising (D) from 0.1 wt % to 15 wt % of a compatibilization agent. 
     
     
         3 . The composition according to any of the preceding claims, wherein the carbon fiber component comprises chopped carbon fibers sized with an epoxy- and phenoxy-based emulsion. 
     
     
         4 . The composition according to any of the preceding claims, wherein the thermoplastic polyolefin elastomer has a density from 0.850 g/cc to 0.875 g/cc as measured by ASTM D792 and a melt flow index from 0.1 g/10 minutes to 50 g/10 minutes as measured by ASTM D1238 at 190° C./2.16 kg. 
     
     
         5 . The composition according to any of the preceding claims, wherein the thermoplastic polyolefin elastomer is an ethylene/alpha-olefin interpolymer. 
     
     
         6 . The composition according to any of the preceding claims, wherein the thermoplastic polyolefin elastomer is an olefin block copolymer 
     
     
         7 . The composition according to any of the preceding claims, wherein the compatibilization agent is a maleic anhydride grafted polypropylene. 
     
     
         8 . The composition according to any of the preceding claims, further comprising a flexural modulus of greater than 2000 MPa, a Charpy impact strength of greater than 6 kJ/m 2 , and a falling dart maximum force energy of greater than 4 J. 
     
     
         9 . The composition according to any of the preceding claims, further comprising an average CLTE value of less than 5E-05 m/m/° C. via machine direction and an average CLTE value of less than 8E-05 m/m/° C. via transverse direction.