Crosslinked polyolefin foam sheet with exceptional softness, haptics, moldability, thermal stability and shear strength

Abstract

A method of making a foam composition includes blending a composition including (i) about 15 to about 75 parts by weight of an olefin block copolymer with a controlled block sequence having a melt flow index of about 0.1 to about 15 grams per 10 minutes at 190° C. and a melting temperature of at least about 115° C., (ii) about 25 to about 85 parts by weight of at least one polypropylene based polymer having a melt flow index from about 0.1 to about 25 grams per 10 minutes at 230° C., (iii) a crosslinking monomer and (iv) a chemical blowing agent to produce a blended composition; crosslinking the blended composition to obtain a crosslinked composition having a crosslinking degree of about 20 to about 75%; and foaming the crosslinked composition at an elevated temperature to obtain a foam composition having a density of about 20 to about 250 kg/m3.

Dependencies are inferred from the claim text.