| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermoplastic elastomer composition for injection foaming molding, which can give an injection foaming molded product having excellent soft feeling and heat resistance at a high foaming rate.SOLUTION: The olefinic elastomer composition for injection foaming molding contains a crosslinked rubber component, 50-95 wt.% of olefinic elastomer (A) having the melt flow rate (230°C, 5.00 kg) of at least 1 g/10 min and at most 70 g/10 min and the type A hardness of at least 40 and at most 80, and 5-50 wt.% of a modified polypropylene based resin satisfying following characteristics of (a)-(c): (a) the melt flow rate is at least 5 g/10 min; (b) the melt tension at 200°C is at least 0.5 cN; (c) the loss tangent, tan δ, which is the ratio of the storage elastic modulus to the loss elastic modulus at an angular oscillation number 1 rad/s measured in the dynamic elastic measurement at 200°C, satisfies the following (i), (ii), wherein (i) at most 2.0 of tan δwhen MFR is at least 5.0 and less than 30, and (ii) at most 4.0 of tan δwhen MFR is at least 30. |
