Thermoplastic resin composition for impact absorbing member and method for producing same

A thermoplastic resin composition for shock absorbing members comprising 1 to 200 parts by weight of an inorganic filler (C) blended with 50 to 80 parts by weight of a thermoplastic resin (A) and 20 to 50 parts by weight of a rubbery polymer having a reactive functional group (B) which together account for 100 parts by weight;

• having morphological features observed by electron microscopy such that:
• the thermoplastic resin (A) and the rubbery polymer having a reactive functional group (B), form a continuous phase and a dispersed phase, respectively, while the inorganic filler (C) are dispersed in the continuous phase and/or the dispersed phase;
• and
• the dispersed phase (B) of the rubbery polymer having a reactive functional group (B) contains fine particles with a particle diameter of 1 to 100 nm of a compound resulting from a reaction between the thermoplastic resin (A) and the rubbery polymer having a reactive functional group (B);
• and
• an area occupied by the fine particles account for 10% or more of the dispersed phase (B);
• and
• a load-displacement curve meeting all of (I), (II) and (III) listed below when a square prism specimen with a cross section of 12.7 mm×12.7 mm and a height of 25.4 mm prepared by injection-molding the thermoplastic resin composition in a parallel direction to its height is subjected to a compression test in which a weight with a mass of 26 kg is allowed to fall freely onto the square prism specimen from a height of 0.5 m:
• (I) the displacement when load becomes zero is 6 mm or more,
• (II) the initial load is 12 kN or more and 30 kN or less, and
• (III) the displacement range included in initial load ±2 kN is 4 mm or more.