Polypropylene base resin composition for foam-molding, foamed article using the same composition, production process for the same foamed article and foam-molded product using the foamed-article
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United States of America Patent
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Feb 4, 2003
Grant Date -
Sep 6, 2001
app pub date -
Feb 16, 2001
filing date -
Feb 29, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A polypropylene base resin composition for foam-molding which use's a propylene.cndot..alpha.,.omega.-diene base copolymer containing a small amount of .alpha.,.omega.-diene and obtained by copolymerizing propylene with a specific amount of .alpha.,.omega.-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.cndot..alpha.,.omega.-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.
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