Abstract: A resin composition, comprising (a) 50 to 99% by weight of a crystalline polypropylene resin, and (b) 1 to 50% by weight of a propylene copolymer comprising 50 to 85% by mol of a propylene unit and 15 to 50% by mol of a C8-12 ?-olefin unit, the propylene copolymer having (1) no meting point in a range of ?100 to 200° C., or a melting point of 50° C. or lower in that temperature range, (2) an isotactic selectivity of 90% or higher, (3) a molecular weight distribution of 3 or smaller, and (4) an intrinsic viscosity of 0.1 to 10 dl/g.

Abstract: A resin composition, comprising (a) 50 to 99% by weight of a crystalline polypropylene resin, and (b) 1 to 50% by weight of a propylene copolymer comprising 50 to 85% by mol of a propylene unit and 15 to 50% by mol of a C8-12 ?-olefin unit, the propylene copolymer having (1) no meting point in a range of ?100 to 200° C., or a melting point of 50° C. or lower in that temperature range, (2) an isotactic selectivity of 90% or higher, (3) a molecular weight distribution of 3 or smaller, and (4) an intrinsic viscosity of 0.1 to 10 dl/g.

Abstract: Disclosed is a method for manufacturing an injection-molded foamed article, the method comprising the steps of: melt-kneading a thermoplastic resin and a chemical foaming agent in a cylinder of an injection unit, injecting the melt-kneaded thermoplastic resin from the cylinder into a cavity of a mold, and cooling and solidifying the thermoplastic resin injected in the cavity, wherein at least one of conditions (1) and (2) given below is satisfied: Mp+35° C.?T?Mp+115° C. and ??1800 sec?1??(1) ?wherein Mp denotes the melting point (° C.) of the thermoplastic resin, T denotes the molding temperature (° C.) and ? denotes the shear rate (sec?1) of the thermoplastic resin during its filling into the cavity at the molding temperature T; Tm?Mp?105° C.??(2) ?wherein Tm denotes a mold temperature (° C.), and Mp has the same meaning as above.

Abstract: Disclosed is a method for manufacturing an injection-molded foamed article, the method comprising the steps of:

Abstract: A resin impact energy absorbing component that is disposed between a structural member of an automobile and a resin internal material arranged on the inner side of the compartment with respect to the structural member, is constituted by arranging a high-rigidity brittle fracture portion and a low-rigidity ductile fracture portion in a parallel fashion. “High-rigidity brittle fracture portion” can be defined as a component that has a large repulsive force at unit deformation (load [N]) and that undergoes fracture at low deformation, and “low-rigidity ductile fracture portion” can be defined as a component that has a small repulsive force at unit deformation (load [N]) and that undergoes fracture at high deformation.

Abstract: A thermoplastic resin is molded by a press-molding method wherein a thermoplastic resin in a molten state is compressed to flow between a pair of female and male molds so as to be formed into a predetermined shape. A compression rate of the mold is controlled so that the following expression (1) is satisfied:0.5.ltoreq.B/A.ltoreq.2 (1)wherein A (mm/s.sup.2) is an acceleration which is realized at a time when the compression rate is 75% of a maximum rate in a compression-acceleration region, which region is defined as a period of time from a moment when the compression of the molten thermoplastic resin is started to a moment when the compression rate reaches the maximum rate; and B (mm/s.sup.2) is a deceleration which is realized at a time when the compression rate is 75% of the maximum rate in a compression-deceleration region, which region is defined as a period of time from a moment when the compression rate reaches the maximum rate to a moment when the closing of the molds is complete.

Abstract: A thermoplastic resin is molded by a press-molding method wherein a thermoplastic resin in a molten state is compressed to flow between a pair of female and male molds so as to be formed into a predetermined shape. A compression rate of the mold is controlled so that the following expression (1) is satisfied:0.5.ltorsim.B/A.ltorsim.2 (1)wherein A (mm/s.sup.2) is an acceleration which is realized at a time when the compression rate is 75% of a maximum rate in a compression-acceleration region, which region is defined as a period of time from a moment when the compression of the molten thermoplastic resin is started to a moment when the compression rate reaches the maximum rate; and B (mm/s.sup.2) is a deceleration which is realized at a time when the compression rate is 75% of the maximum rate in a compression-deceleration region, which region is defined as a period of time from a moment when the compression rate reaches the maximum rate to a moment when the closing of the molds is complete.

Abstract: In a method of simulating flow behavior of a resin in a process for press-molding the resin by use of a press-molding machine comprising a press apparatus equipped with a hydraulic circuit, and first and second molds at least one of which is connected to the press apparatus, disclosed is a method comprising a step of determining, from a characteristic of the hydraulic circuit, an elastic coefficient of the press apparatus, and an apparent elastic coefficient of the resin, a true compression rate imparted to the resin by the press apparatus, and a step of sequentially analyzing, based on the true compression rate, flow behavior of the resin.