Composite resin particles, foamable particles, foamed particles, molded foam, and production method for composite resin particles

Abstract

An object of the present invention is to provide composite resin particles that can give a foam molded body having excellent strength without undergoing an annealing step in the production of the composite resin particles, and to also provide foam particles that allow relatively fast dissipation of a foaming agent and can reduce the molding cycle of the foam molded body. The present invention relates to the following polystyrene-based composite resin particles (C), Polystyrene-based composite resin particles (C) for producing a foam molded body, the composite resin particles (C) comprising a polyolefin-based resin and a polystyrene-based resin at a mass ratio of 10:90 to 50:50, wherein in an image of the composite resin particles (C) obtained by the following method, (1) a bicontinuous structure of the polyolefin-based resin and the polystyrene-based resin is observed, (2) one or more polystyrene-based resin fine particles having a particle size of 1.0 μm or more are observed, and (3) the area ratio of the polystyrene-based resin fine particles having a particle size of 1.0 μm or more is 1 to 50%. Image acquisition method: The composite resin particles (C) are each sliced along a line passing through the center of the particle, and the resulting thin film is photographed with a transmission electron microscope to obtain an image of a square area having sides of 10 μm and including the center of the particle.

Dependencies are inferred from the claim text.