| 摘要 |
PROBLEM TO BE SOLVED: To provide joint boots for further improving bending fatigue resistance, in the joint boots molded by using acrylic rubber/polyamide-based thermoplastic elastomer composed of a polyamide resin and cross-linked acrylic rubber. SOLUTION: The joint boots are composed of the polyamide resin and the cross-linked acrylic rubber, and are formed by including carbon black having an average basic particle size (an average primary particle size) of 50 nm or less by 0.2 to 3 wt.% there, and are molded by using the acrylic rubber/polyamide-based thermoplastic elastomer including the carbon black. Carbon black of an ASTM code (D-1765-91) of N220 to N660 is used as the carbon black having such an average basic particle size. These joint boots can not only sufficiently satisfy heat resistance required there even when used on the inboard side but also can largely improve the bending fatigue resistance. COPYRIGHT: (C)2008,JPO&INPIT
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