US Patent 8435615 Hollow foamed blow-molded article

A hollow foamed blow-molded article has a polypropylene-based resin foam layer, wherein the polypropylene-based resin foam layer has an equilibrium compliance Je0 of 2.0×10−3 Pa−1 or more and a swell S of 2.5 or less, wherein the foam layer has an apparent density “d” of 0.20 to 0.65 g/cm3 and a ratio a/c of an average cell diameter “a” in the thickness direction of the molded article to an average cell diameter “c” in the longitudinal direction of the molded article of 0.1 to 0.5. The hollow foamed blow-molded article has an average molded article thickness T of 1 to 5 mm and a variation coefficient Cv of the molded article thickness of 50% or less.