SHOCK ABSORBING MATERIAL

摘要

A conventional shock absorbing material formed from a foamed molding of polypropylene resin particles has an excellent cushioning property and impact resilience as compared with shock absorbing materials formed of other material resins, but is not satisfactory in terms of rigidity and energy absorbing efficiency. The present invention provides a shock absorbing material formed from an in-mold formed molding manufactured by using foamed particles, of which a base material resin is a propylene homopolymer prepared with the use of a metallocene polymerization catalyst. The base material resin has a tensile elastic modulus of 15000 kgf/cm<2> or more, and the in-mold formed molding has such a crystal structure that an intrinsic peak a and a high temperature peak b appear as endothermic peaks in the DSC curve obtained by differential scanning calorimetry of the molding. The high temperature peak b appears on a higher temperature side than the inherent peak a does, and has a heat quantity of 25 J/g or more.