Kaneka Corporation

Ryuta Kutsumizu

Ryoji Nakayama

Kirito Suzuki

Koji Shimizu

Shotaro Maruhashi

Yoshihito Yano

Expandable styrene resin particles include 2.0 wt % to 8.0 wt % of graphite, and the graphite has a mean particle size of 2.5 &#x3bc;m to 9 &#x3bc;m. The expandable styrene resin particles satisfy (i) a laser scattering intensity per unit solution concentration of the graphite is not less than 5 {%/(mg/ml)}/wt %, (ii) an area of the graphite per unit solution concentration of the graphite in 1 mmis not less than 55 ({mm/mm}/{g/g}), or (iii) when the expandable styrene resin particles are pre-expanded and are made into an expanded molded product having an expansion ratio of 40 times, a value (%/wt %) obtained by dividing, by the content of the graphite (wt %), a percentage of an area occupied by the graphite in a surface layer of the expanded molded product (%), a quotient of which is further multiplied by 100, is not less than 100.

Expandable styrene resin particles, pre-expanded particles of styrene resin, styrene resin foam molded body, and method for producing expandable resin particles

Pre-expanded polypropylene-based resin particles include a polypropylene-based resin. The polypropylene-based resin satisfies tan &#x3b4;&#x2264;0.32&#xd7;V+0.1, where tan &#x3b4; represents a loss tangent at an angular frequency of 0.1 rad/s in dynamic viscoelastic behavior measurement at 200&#xb0; C. and V represents a melt fracture take-up speed (m/min) at 200&#xb0; C.

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Osaka, Japan

Ryuta Kutsumizu