Olefin type thermoplastic elastomer

   
   

An olefin type thermoplastic elastomer which satisfies the following formulae (I) to (III): Y.ltoreq.-2X+350 (I) X<95 (II) Z.ltoreq.150 (III) where X, Y and Z are as follows: X: JIS A hardness of a molded product as measured in accordance with JIS K6253 (no unit); Y: rate of change in the weight of a molded product measured based on JIS K6258 using IRM903 oil at 120.degree. C. (unit: %); and Z: number of granular structures on an extruded sheet surface (250 mm.times.1,500 mm) (unit: granular structures).

 
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