| 摘要 |
[PROBLEM] To provide a process for preparing a thermoplastic elastomer composition which is inhibited from sink mark in the injection welding of a linear part and a corner part of a glass run channel and has excellent bond properties, and a molded product obtained by the use of the composition. [MEANS FOR SOLVING PROBLEM] A process for preparing a thermoplastic elastomer composition (F) for injection molding, comprising dynamically heat-treating a thermoplastic elastomer composition (D), which comprises 95 to 5 parts by weight of an ethylene/α-olefin-based copolymer rubber (a), 5 to 95 parts by weight of a propylene/α-olefin random copolymer (b-1) (total of the components (a) and (b-1): 100 parts by weight), and 0 to 200 parts by weight of a softener (c), in the presence of an organic peroxide, wherein a crystallization nucleating agent (e) for olefin-based plastics is added in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of the total of the components (a) and (b-1) before or after the dynamic heat treatment.
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