The present invention provides expanded beads comprising a crosslinked multi-block copolymer containing an ethylene block and an ethylene-α-olefin copolymer block, having an apparent density of 40 to 300 g/L, a gel fraction of 30 to 70% by weight by a hot xylene extraction method, an average cell diameter (a) of 50 to 180 μm, and an average surface layer thickness (b) of 3 to 27 μm, and the expanded beads are excellent in in-mold moldability, and can produce an expanded beads molded article being excellent in tensile characteristics in a well balanced manner.

The present invention provides expanded beads comprising a crosslinked multi-block copolymer containing an ethylene block and an ethylene-α-olefin copolymer block, having an apparent density of 40 to 300 g/L, a gel fraction of 30 to 70% by weight by a hot xylene extraction method, an average cell diameter (a) of 50 to 180 μm, and an average surface layer thickness (b) of 3 to 27 μm, and the expanded beads are excellent in in-mold moldability, and can produce an expanded beads molded article being excellent in tensile characteristics in a well balanced manner.

The present invention relates to a foam composition for vehicle seat cushions, foam for a vehicle seat cushion, and a manufacturing method therefor, the foam composition comprising: (A) 49.5 wt % to 80 wt % of a polypropylene-based resin; (B) 19.5 wt % to 50 wt % of a modified olefin-based elastomer resin having a melting temperature (Tm) of 60° C. to 110° C. and a melting index (MI) value of 0.5 g/10 min to 4 g/10 min, as measured at 190° C. under a load of 2.16 kg according to ASTM D1238; and 0.1 wt % to 0.5 wt % of (C) a filler.

Expandable methyl methacrylate resin particles having a narrow particle size distribution, a good yield, and excellent expandability and formability are provided. The expandable methyl methacrylate resin particles include a base resin containing, as constitutional units, a certain amount of a methyl methacrylate unit and a certain amount of acrylic ester unit, and a blowing agent. The expandable methyl methacrylate resin particles have an average particle diameter of 0.6 mm to 1.0 mm and a particle diameter variation coefficient of not more than 20%.

Expandable methyl methacrylate resin particles having a narrow particle size distribution, a good yield, and excellent expandability and formability are provided. The expandable methyl methacrylate resin particles include a base resin containing, as constitutional units, a certain amount of a methyl methacrylate unit and a certain amount of acrylic ester unit, and a blowing agent. The expandable methyl methacrylate resin particles have an average particle diameter of 0.6 mm to 1.0 mm and a particle diameter variation coefficient of not more than 20%.

The present invention relates to expanded particles and an expanded molded article. More specifically, the present invention relates to expanded particles comprising a polycarbonate-based resin as a base resin, which has a specified cell density X and a specified average cell wall thickness, as well as an expanded molded article. In addition, the present invention relates to expanded particles comprising a polycarbonate-based resin as a base resin, which has a specified bulk ratio and a specified average cell diameter, as well as an expanded molded article.

The present invention relates to expanded particles and an expanded molded article. More specifically, the present invention relates to expanded particles comprising a polycarbonate-based resin as a base resin, which has a specified cell density X and a specified average cell wall thickness, as well as an expanded molded article. In addition, the present invention relates to expanded particles comprising a polycarbonate-based resin as a base resin, which has a specified bulk ratio and a specified average cell diameter, as well as an expanded molded article.

The present invention is concerned with expanded beads of a block copolymer of a polyethylene block and an ethylene/α-olefin copolymer block, wherein a xylene insoluble fraction (A) of the expanded beads by a hot xylene extraction method is 10 to 70% by weight, and a ratio (A/B) of the xylene insoluble fraction (A) to a xylene insoluble fraction (B) of the expanded beads by a hot xylene extraction method when divided into two equal parts and measured is 1.0 to 1.1, and is able to provide expanded beads with excellent in-mold moldability and an expanded beads molded article with excellent fusion bondability and restorability.

The present invention is concerned with expanded beads of a block copolymer of a polyethylene block and an ethylene/α-olefin copolymer block, wherein a xylene insoluble fraction (A) of the expanded beads by a hot xylene extraction method is 10 to 70% by weight, and a ratio (A/B) of the xylene insoluble fraction (A) to a xylene insoluble fraction (B) of the expanded beads by a hot xylene extraction method when divided into two equal parts and measured is 1.0 to 1.1, and is able to provide expanded beads with excellent in-mold moldability and an expanded beads molded article with excellent fusion bondability and restorability.

Molded parts for automobile interiors can be made from expanded thermoplastic polyurethane beads. Processes can be used to produce the molded parts from thermoplastic polyurethane.