| http://www.w3.org/ns/prov#value | - A process for making a non-crosslinked foam comprising the steps of:blending 72 to 98% by weight of a 1-butene polymer selected from the group consisting of a homopolymer, and a copolymer composed of at least 80 mole % of polymerized units of 1-butene and not more than 20 mole % of an alpha-olefin having 2 to 20 carbon atoms other than 1-butene and mixtures thereof with 28 to 2% by weight of a pro
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