Abstract: A polyolefin composition comprising a discontinuous polymer phase dispersed in a continuous polyolefin phase is disclosed. The discontinuous polymer is polymerized by a method comprising reacting a blend or mixture of the polyolefin and one or more polyethylenically unsaturated monomers in the presence of a free radical initiator. Articles and materials made from he composition exhibit several advantageous properties as compared to the corresponding unmodified polyolefins, for example printability, paintability, and dyeability in the case of spun fiber, sheets, automotive applications such as interior parts and bumpers; toughness and abrasion resistance in the case of flooring, and impact strength in the case of siding.