Patent ID: 8604125

Claim:
A polypropylene-based resin composition, comprising: a) a polypropylene; b) an ethylene 1-octane copolymer in which 0.5≦r 1 r 2 <1, wherein r 1 =k 11 /k 12 , r 2 =k 22 /k 21 , k 11 is a growth reaction rate constant when ethylene is added to a growth chain in which an end active site is ethylene, k 12 is a growth reaction rate constant when octene is added to a growth chain in which an end active site is ethylene, k 22 is a growth reaction rate constant when octane is added to a growth chain in which an end active site is octene, and k 21 is a growth reaction rate constant when ethylene is added to a growth chain in which an end active site is octane; and c) an inorganic filler, wherein heat deflection temperature (HDT) of the polypropylene-based resin composition ranges from 114° C. to 122° C., wherein HDT is determined according to ASTM D648 at 4.6 kilograms.