ABSTRACT
I sotactic polypropylene is not intrinsically tough at lower temperatures, yet its other properties make it attractive for applications where toughness is desirable. Polypropylene is rendered impact resistant when ethylene-propylene copolymeric elastomers are incorporated, commonly at the 5–15% level. This can be done either by blending or by synthesizing ethylene-propylene elastomers in situ in polypropylene homopolymers.
