Crosslinkable thermoplastic elastomer composition, crosslinked thermoplastic elastomer, and engine intake air duct using the same

Abstract

To provide a composition which satisfies characteristics such as heat resistance, oil resistance and compressive permanent set, and moldability that are required for an engine suction duct, and is also excellent in oil permeant resistance.SOLUTION: A crosslinkable thermoplastic elastomer composition contains: (a) 10-20 mass% of a propylene-based homopolymer; (b) 13-30 mass% of a block copolymer of a hard segment composed of an aromatic vinyl unit and a soft segment block composed of a conjugated diene unit, or its hydrogenation product; (c) 13-22 mass% of an ethylene-based copolymer rubber; (d) 40-50 mass% of a softening agent for non-aromatic rubber; wherein the total of the above components (a), (b), (c) and (d) is 100 mass%, the hard segment block containing the aromatic vinyl compound of the component (b) has a styrene unit, and a styrene unit having a substituent and / or a vinylcyclohexene unit which may have a substituent; and (e) 3-9 pts.mass of a phenol resin-based crosslinking agent with respect to 100 pts.mass of the total of the (b) and (c).SELECTED DRAWING: None