Polyamide-based thermoplastic elastomer composition and molded article thereof

A polyamide-based thermoplastic elastomer composition comprising:

• a polyamide [I] comprising a structural unit derived from terephthalic acid with 30 to 100% by mole in total structural units of dicarboxylic acids and a melting point (Tm) determined by differential scanning calorimetry (DSC) of the polyamide being 220 to 290° C. as a matrix component;
• and
• a dispersion component dispersed in the matrix component, the dispersion component being a particle comprising an ethylene-α-olefin-unconjugated polyene copolymer rubber [II] comprising structural units derived from ethylene [a], an α-olefin [b] having 3 to 20 carbon atoms and an unconjugated polyene [c] having at least one carbon-carbon double bond in one molecule, respectively, and an olefin-based polymer [III] comprising 0.3 to 5.0% by mass of a functional group structural unit in a molecule, and the dispersion component being satisfied the following (1):
• (1) a cross sectional area of the particle, in which a particle size is 5 μm or more, of the dispersion component is measured, and a proportion of a cumulative cross sectional area of the area of the particle to an entire cross sectional area analyzed is 10% or less.

A polyamide-based thermoplastic elastomer composition [Y1], in which

• a rubber composition [X] comprising:
• 10 to 60% by mass of a polyamide [I] comprising a structural unit derived from terephthalic acid with 30 to 100% by mole in total structural units of dicarboxylic acids and a melting point (Tm) determined by differential scanning calorimetry (DSC) of the polyamide being 220 to 290° C.;
• 30 to 86% by mass of an ethylene-α-olefin-unconjugated polyene copolymer rubber [II] comprising structural units derived from ethylene [a], an α-olefin [b] having 3 to 20 carbon atoms and an unconjugated polyene [c] having at least one carbon-carbon double bond in one molecule, respectively;
• and
• 3 to 30% by mass of an olefin-based polymer [III] comprising 0.3 to 5.0% by mass of a functional group structural unit in a molecule, and
• 1 to 10% by mass of a phenol resin-based crosslinking agent [IV] are dynamically crosslinked, provided that a total amount of [I], [II], [III] and [IV] is 100% by mass.

A polyamide-based thermoplastic elastomer composition [Y2] in which

• a rubber composition [X] comprising:
• 30 to 87.7% by mass of a polyamide [I] comprising a structural unit derived from terephthalic acid with 30 to 100% by mole in total structural units of dicarboxylic acids and a melting point (Tm) determined by differential scanning calorimetry (DSC) of the polyamide being 220 to 290° C.;
• 10 to 45% by mass of an ethylene-α-olefin-unconjugated polyene copolymer rubber [II] comprising structural units derived from ethylene [a], an α-olefin [b] having 3 to 20 carbon atoms and an unconjugated polyene [c] having at least one carbon-carbon double bond in one molecule, respectively;
• and
• 2 to 20% by mass of an olefin-based polymer [III] comprising 0.3 to 5.0% by mass of a functional group structural unit in a molecule, and
• 0.3 to 5.0% by mass of a phenol resin-based crosslinking agent [IV] are dynamically crosslinked, provided that a total amount of [I], [II], [III] and [IV] is 100% by mass.