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AssigneeChisso Corporation
InventorsMototake Tsutsui, Hiroyuki Maehara, Kouichi Hatada, Tsutomu Ushioda
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A polypropylene base resin composition for foam-molding which use's a propylene•α,ω-diene base copolymer containing a small amount of α,ω-diene and obtained by copolymerizing propylene with a specific amount of α,ω-diene in the presence of a catalyst system for polymerizing olefin comprising a metallocene supported catalyst or a pre-activated metallocene supported catalyst and an organic aluminum compound and which provides a foamed article having uniform and fine foamed cells (bubbles) and a high foaming magnification, a foamable polypropylene base resin composition comprising the propylene•α,ω-diene base copolymer and a specific amount of a foaming agent, a foamed article obtained by foam-molding the above composition, a production process for the above foamed article and a foam-molded product prepared by heat-molding the above foamed article.
A polypropylene base resin composition for foam-molding comprising a propylene•α, ω-diene base copolymer containing 0.00001 to 2% by weight of α, ω-diene and a foaming nuclear agent contained therein, wherein the propylene•α, ω-diene base copolymer is obtained by copolymerizing propylene with α, ω-diene in the presence of a catalyst system for (co)polymerizing olefin comprising a metallocene supported catalyst obtained by carrying out in order the following step (a) to step (c) or a pre-activated metallocene supported catalyst obtained by carrying out in order the following step (a) to step (d) and an organic aluminum compound:
A foamable polypropylene base resin composition comprising 100 parts by weight of the propylene•α, ω -diene base copolymer as described in claim 1 and 0.1 to 50 parts by weight of a foaming agent.
Dependencies are inferred from the claim text.