| http://www.w3.org/ns/prov#value | - pylene polymer selected from the group consisting of a homopolymer, and a copolymer composed of at least 70 mole % of polymerized units of propylene and not more than 30 mole % of polymerized units of an alpha-olefin having 2 to 10 carbon atoms other than propylene and mixtures thereof, and a blowing agent in a mixer; melt-kneading the mixture in an extruder; extruding the melt-kneaded mixture fro
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