CPC C08L 23/16 (2013.01) [C08J 3/005 (2013.01); C08L 53/00 (2013.01); C08J 2323/16 (2013.01); C08J 2353/00 (2013.01); C08J 2423/08 (2013.01); C08J 2423/12 (2013.01); C08J 2423/16 (2013.01); C08J 2491/00 (2013.01); C08L 2203/30 (2013.01); C08L 2205/025 (2013.01); C08L 2205/035 (2013.01); C08L 2207/04 (2013.01); C08L 2207/322 (2013.01)] | 19 Claims |
1. A method for producing a thermoplastic elastomer composition, wherein the produced thermoplastic elastomer composition contains 5 mass % or less of a mineral oil (C), the method comprising:
a first step of melt-kneading polypropylene (A-1) and an ethylene-based copolymer rubber (B) in the presence of an organic peroxide, the polypropylene (A-1) being polypropylene of which 20° C. xylene insoluble fraction has an intrinsic viscosity [ηcxis] of 0.1 dl/g or more and less than 1.5 dl/g; and
a second step of further adding polypropylene (A-2) of which 20° C. xylene insoluble fraction has an intrinsic viscosity [ηcxis] of 1.5 dl/g or more and 7 dl/g or less, and
melt-kneading the resulting mixture.
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