Patent ID: 8097672

Claim:
A crosslinked material obtainable by crosslinking a propylene resin composition through irradiation with an ionizing radiation wherein the propylene resin composition comprises: 100 parts by mass of a propylene resin comprising 15 to 99% by mass of a propylene polymer (A) having a melting point, as measured by a differential scanning calorimeter (DSC), of 120 to 170° C., and 1 to 85% by mass of a propylene polymer (B) having a melting point, as measured by a differential scanning calorimeter (DSC), of not more than 100 ° C. provided that the total of the components (A) and (B) is 100% by mass, 0.1 to 5 parts by mass of a crosslinking assistant (C), and 30 to 300 parts by mass of an inorganic filler (D), wherein the propylene polymer (B) is a random copolymer (B-1) containing a constitutional unit derived from propylene and a constitutional unit derived from an α-olefin having 4 to 20 carbon atoms and satisfying the following properties (a) and (b): (a) the molecular weight distribution (Mw/Mn), as measured by Gel permeation chromatography (GPC), is 1 to 3; (b) the melting point (Tm) (° C.) and the content M (mol%) of the constitutional unit derived from an α-olefin having 4 to 20 carbon atoms, as determined by 13 C-NMR spectrum, satisfy the following formula (I): 146 exp(−0.022M) ≧Tm ≧125 exp(−0.032M) (I).