Abstract: Composite resin particles including: a polyethylene-based resin and a polystyrene-based resin, wherein the polyethylene-based resin and the polystyrene-based resin are included in the ranges of 50 to 20% by mass and 50 to 80% by mass respectively, with respect to the total of these resins, the polyethylene-based resin is composed of: a first polyethylene-based resin having a medium density to a high density in the range of 925 to 965 kg/m3; and a second polyethylene-based resin which is linear and which has a lower density than the first polyethylene-based resin, and the first polyethylene-based resin and the second polyethylene-based resin are included in the ranges of 90 to 30% by mass and 10 to 70% by mass respectively, with respect to the total of these resins.

Abstract: Expandable styrene composite polyolefin-based resin particles which comprise styrene composite polyolefin-based resin particles containing a polyolefin-based resin and 100 to 400 parts by mass of a styrene-based resin with respect to 100 parts by mass of the polyolefin-based resin and comprise butane/pentane in a mass ratio of 80/20 to 50/50 as a volatile blowing agent.

Abstract: Composite resin particles including: a polyethylene-based resin and a polystyrene-based resin, wherein the polyethylene-based resin and the polystyrene-based resin are included in the ranges of 50 to 20% by mass and 50 to 80% by mass respectively, with respect to the total of these resins, the polyethylene-based resin is composed of: a first polyethylene-based resin having a medium density to a high density in the range of 925 to 965 kg/m3; and a second polyethylene-based resin which is linear and which has a lower density than the first polyethylene-based resin, and the first polyethylene-based resin and the second polyethylene-based resin are included in the ranges of 90 to 30% by mass and 10 to 70% by mass respectively, with respect to the total of these resins.

Abstract: Modified polystyrene cross-linked resin particles in which polyacrylic acid ester-based resin fine particles having an average particle diameter in the range of 30 to 1,000 nm are dispersed in polystyrene-based resin particles, wherein the content of gel component fraction insoluble to toluene when about 1 g of the modified polystyrene-based cross-linked resin particles is dissolved in 50 ml of toluene at 25° C. is in the range of from 5 to 25% and the gel component shows a degree of swelling in the range of from 10 to 20 in toluene at 25° C.

Abstract: Expanded composite polystyrene-based resin particles having a plurality of cells and cell membranes separating the plurality of cells, said cell membranes including a polystyrene-based resin forming a continuous phase and polyacrylic acid alkyl ester-based resin fine particles dispersed in said continuous phase to form a dispersed phase, and said polystyrene-based resin being complexed with said polyacrylic acid alkyl ester-based resin fine particles, wherein said dispersed phase is present in the form of a plurality of layers in a cell membrane thickness direction in a cell membrane cross-section of said expanded composite polystyrene-based resin particles.

Abstract: Modified polystyrene-based resin particles comprising polyacrylic acid ester-based resin microparticles having an average particle diameter in the range of from 30 to 1,000 nm being dispersed in polystyrene-based resin particles, such that the polyacrylic acid ester-based resin microparticles are present (1) in the area ratio of from 0.1 to 15% in a surface area, which includes areas up to 20 ?m from the surface of each resin particle, and (2) present in the area ratio of from 11 to 50% in the inner area, which includes the area between the center of each resin particle and an point 30% of the radius from the center of each particle.

Abstract: Expanded composite polystyrene-based resin particles having a plurality of cells and cell membranes separating the plurality of cells, said cell membranes including a polystyrene-based resin forming a continuous phase and polyacrylic acid alkyl ester-based resin fine particles dispersed in said continuous phase to form a dispersed phase, and said polystyrene-based resin being complexed with said polyacrylic acid alkyl ester-based resin fine particles, wherein said dispersed phase is present in the form of a plurality of layers in a cell membrane thickness direction in a cell membrane cross-section of said expanded composite polystyrene-based resin particles.

Abstract: Modified polystyrene-based resin particles comprising polyacrylic acid ester-based resin microparticles having an average particle diameter in the range of from 30 to 1,000 nm being dispersed in polystyrene-based resin particles, such that the polyacrylic acid ester-based resin microparticles are present (1) in the area ratio of from 0.1 to 15% in a surface area, which includes areas up to 20 ?m from the surface of each resin particle, and (2) present in the area ratio of from 11 to 50% in the inner area, which includes the area between the center of each resin particle and an point 30% of the radius from the center of each particle.