Abstract: A process for making a thermoplastic polyolefin elastomer comprising: a) preparing a polymer mixture comprising: (I) about 70 to about 95% by weight of a heterophasic polyolefin; (II) about 4.9 to about 27% by weight of a reactive, peroxide-containing olefin polymer; (III) about 0.1 to about 3.0% by weight of an organic peroxide; and (IV) optionally, about 1 to about 10% by weight of a co-agent having a molecular structure containing at least two aliphatic unsaturated carbon-carbon bonds; wherein (I)+(II)+(III)+(IV) equals 100%; b) extruding or compounding in molten state the polymer mixture, thereby producing a melt mixture; and optionally c) pelletizing the melt mixture.

Abstract: A process for making an improved soft olefin polymer material comprising: a) preparing a polymer mixture comprising: (I) about 70 to about 95% by weight of a heterophasic polyolefin; (II) about 5 to about 30% by weight of a reactive, peroxide-containing olefin polymer; and (III) optionally, about 1 to about 10% by weight of a co-agent having a molecular structure containing at least two aliphatic unsaturated carbon-carbon bonds; wherein (I)+(II)+(III) equals 100%; b) extruding or compounding in molten state the polymer mixture, thereby producing a melt mixture; and optionally c) pelletizing the melt mixture.