Carbon-containing modified polystyrene type resin particle, foamable carbon-containing modified polystyrene type resin particle, carbon-containing modified polystyrene type resin foamed particle, carbon-containing modified polystyrene type resin foamed molded product, and production methods thereof

A method of producing a carbon-containing modified polystyrene type resin particle, said method comprising:

• dispersing 100 parts by weight of a carbon-containing polypropylene type resin particle, not less than 100 parts by weight but less than 400 parts by weight of a styrene type monomer, and a polymerization initiator within an aqueous suspension containing a dispersant,
• heating a resulting dispersion to a temperature at which said styrene type monomer undergoes substantially no polymerization, thereby impregnating said carbon-containing polypropylene type resin particle with said styrene type monomer,
• performing a first polymerization of said styrene type monomer at a temperature within a range from (T−10)° C. to (T+20)° C., wherein T° C. represents a melting point of said carbon-containing polypropylene type resin particle, and
• following said first polymerization, adding a styrene type monomer and a polymerization initiator, and then heating to a temperature within a range from (T−25)° C. to (T+10)° C., thereby impregnating said carbon-containing polypropylene type resin particle with said styrene type monomer and performing a second polymerization.