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AssigneeSekisui Plastics Co., Ltd.
InventorsHideyasu Matsumura, Tatsuya Matsugashita
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A method for producing styrene-modified polyethylene-based resin beads, including the steps of: dispersing 100 parts by weight of polyethylene-based resin beads which contain an inorganic nucleating agent and have a melting point of 95° C. to 115° C., 20 parts by weight or more and less than 300 parts by weight of a styrene-based monomer and a polymerization initiator into an aqueous suspension containing a dispersant; impregnating the polyethylene-based resin beads with the styrene-based monomer under heating the resulting dispersion at such a temperature that the styrene-based monomer does not substantially polymerize; and performing polymerization of the styrene-based monomer at a temperature of (T)° C. to (T+25)° C. (where T° C. is a melting point of the polyethylene-based resin beads.)
Styrene-modified polyethylene-based resin particles, wherein the particles comprise from 20 parts by weight to less than 300 parts by weight of styrene-based resin relative to 100 parts by weight of polyethylene-based resin that contains an inorganic nucleating agent and has a melting point of 95° C. to 115° C., and wherein the styrene-based resin is dispersed in a form of particles in polyethylene-based resin particles, a particle diameter of a styrene-based resin particle being 0.8 μm or smaller both in a surface region within at least 5 μm. from a surface of a modified resin particle and in a center region of a modified resin particle.
Dependencies are inferred from the claim text.