Foamable composite resin particles, method of producing the same, foamed particles, method of producing the same, foamed molded article, and automobile member

Abstract

[Object] An object of the present invention is to provide foamable particles in which a decrease in foaming power due to cryopreservation is reduced and which have sufficient foaming power after cryopreservation and a method of producing the same. [Solution] The present invention relates to foamable particles that are obtained by incorporating a foaming agent into composite resin particles prepared by impregnating and polymerizing styrene monomers into seed particles containing a polypropylene resin and an ethylene-vinyl acetate copolymer, the foaming agent is pentane, the water content of the foamable particles with respect to the mass of the foamable particles is 1 mass % or less, and (1) the foamable particles contain 0.1 to 4.0 mass % of a carbon component with respect to the mass of the foamable particles and the mass average molecular weight (in terms of polystyrene) of the foamable particles is 250,000 to 550,000, or (2) the foamable particles do not contain a carbon component or contain less than 0.1 mass % of a carbon component with respect to the mass of the foamable particles, and the mass average molecular weight (in terms of polystyrene) of the foamable particles is 350,000 to 550,000.

Dependencies are inferred from the claim text.