Filled TPO compositions with good low temperature ductility
AssigneeDow Global Technologies LLC
InventorHenry G. Heck
Life of this patent
Estimating the term…
Loading patent…
AssigneeDow Global Technologies LLC
InventorHenry G. Heck
Estimating the term…
Filled, thermoplastic polyolefin (TPO) compositions having a total energy absorption during impact at −30° C. of at least 20 ft-lb-f as measured by an Instrumented Dart Impact Test (ASTM D3763) at 6.7 m/s and a peak tangent flexural modulus of>2100 MPa (305,000 psi as measured by ASTM D-790, the composition comprising based on the total weight of the TPO composition; A) 36-56 wt % of a crystalline polypropylene having a MFR of at least 1 and a melting point of at least 160° C. as measured by DSC; and B) 64-44 wt % of an elastomer/filler composition comprising (1) an EAO elastomer having a (1) Tg of less than −50° C. as measured by DSC, (b) tan delta between >2 and 3 as measured at 0.1 rad/s and 190° C. with an Advanced Rheometrie Expansion Systems rheometer. and (c) HDT greater than or equal to the peak melting temperature of the elastomer as measured by DSC, and (2) a platy filler, e.g., talc, the elastomer and filler present at a weight ratio of elastomer to filler of 3:2 to 2:1; the crystalline polypropylene and elastomer present at a weight ratio of polypropylene to elastomer of less than 2.
A filled, TPO composition having a total energy absorption during impact at −30° C. of at least 22 ft-lb-f, (29.83 N-m or J) as measured by an Instrumented Dart Impact Test ASTM D3763 at 6.7 meters/second and a peak tangent flexural modulus equal to or greater than (≧) 2100 MegaPascal (MPa) (305,000 pounds per square inch (psi)) as measured by ASTM D-790, the composition comprising based on the total weight of the TPO composition:
A filled, TPO composition having a total energy absorption during impact at −30° C. of at least 22 ft-lb-f, (29.83 N-m or J) as measured by an Instrumented Dart Impact Test ASTM D3763 at 6.7 meters/second and a peak tangent flexural modulus equal to or greater than (≧) 2100 MPa (305,000 psi) as measured by ASTM D-790, the composition comprising based on the total weight of the TPO composition:
Dependencies are inferred from the claim text.