| http://www.w3.org/ns/prov#value | - Examples of the volatile blowing agent to be impregnated into the polypropylene resin particles in the present invention are, for instance, an aliphatic hydrocarbon such as propane, butane, pentane or hexane; an alicyclic hydrocarbon such as cyclopentane or cyclobutane; and a halogenated hydrocarbon such as trichlorotrifuoromethane, dichlorodifluoromethane, dichlorotetrafluoromethane, trichlorotri
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