Thermoplastic elastomer composition for foaming, molded foam thereof, composition molded product using the molded foam, and instrument panel for automobile[Problem] To provide a thermoplastic elastomer composition for foaming, which has sufficient foamability and provides a molded article having good appearance. [Solution to Problem] A thermoplastic elastomer composition for foaming, which comprises 10 to 40% by weight of a partially or completely crosslinked ethylene/α-olefin/non-conjugated polyene copolymer rubber (A) comprising ethylene, an α-olefin of 3 to 20 carbon atoms and a non-conjugated polyene, 3 to 33% by weight of an ethylene/α-olefin copolymer (B) comprising ethylene and an α-olefin of 3 to 20 carbon atoms, 10 to 40% by weight of polypropylene (C) having a melting point, as determined by differential scanning calorimetry (DSC), of 40 to 170° C., 10 to 45% by weight of a softener (D) for rubbers, and at least one substance selected from an isotactic propylene-based polymer (E-a) in an amount of 1 to 30% by weight and a syndiotactic α-olefin-based copolymer (E-b) in an amount of 1 to 20% by weight, with the proviso that the total amount of the components (A), (B), (C), (D), (E-a) and (E-b) is 100% by weight.A thermoplastic elastomer composition for foaming, comprising: 10 to 40% by weight of a partially or completely crosslinked ethylene/α-olefin/non-conjugated polyene copolymer rubber (A) comprising ethylene, an α-olefin of 3 to 20 carbon atoms and a non-conjugated polyene, 3 to 33% by weight of an ethylene/α-olefin copolymer (B) comprising ethylene and an α-olefin of 3 to 20 carbon atoms, 10 to 40% by weight of polypropylene (C) having a melting point, as determined by differential scanning calorimetry (DSC), of 40 to 170° C, 10 to 45% by weight of a softener (D) for rubbers, and at least one substance selected from an isotactic propylene-based polymer (E-a) in an amount of 1 to 30% by weight and a syndiotactic α-olefin-based copolymer (E-b) in an amount of 1 to 20% by weight, with the proviso that the total amount of the components (A), (B), (C), (D), (E-a) and (E-b) is 100% by weight, wherein the component (E-a) satisfies the following requirements (i) to (iv): (i) the molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), is in the range of 1 to 10, (ii) the amount of constitutional units derived from propylene is in the range of 40 to 85% by mol and the amount of constitutional units derived from an α-olefin of 2 to 20 carbon atoms (other than propylene) is in the range of 60 to 15% by mol, (iii) the melt flow rate (MFR, ASTM D1238, 190° C, load of 2.16 kg) is in the range of 0.1 to 50 g/10 min, and (iv) in the differential scanning calorimetry (DSC), any melting point is not observed, the component (E-b) contains constitutional units (E-1) derived from propylene, constitutional units (E-2) derived from ethylene, constitutional units (E-3) derived from an olefin of 4 to 20 carbon atoms, and optionally constitutional units (E-4) derived from a conjugated polyene or a non-conjugated polyene, the component (E-h) contains the constitutional units (E-1) in an amount of 30 to 79% by mol, the constitutional units (E-2) in an amount of 1 to 30% by mol and the constitutional units (E-3) in an amount of 10 to 50% by mol, in 100% by mol of the total of the constitutional units (E-1), (E-2) and (E-3), with the proviso that the total amount of the constitutional units (E-2) and (E-3) is in the range of 21 to 70% by mol, and contains the constitutional units (E-4) in an amount of 0 to 30% by mol based on 100% by mol of the total of the constitutional units (E-1), (E-2) and (E-3), and when 13C-NMR of the component (E-b) is measured in a 1,2,4-trichlorobenzene solution using tetramethylsilane as a reference material, the sum total of absorptions of methyl groups of propylene units observed at about 20.0 to 21.0 ppm is not less than 0.5 time the sum total of absorptions of methyl groups of propylene units observed at about 19.0 to 22.0 ppm, and the component (E-b) has a substantially syndiotactic structure.
발포용 열가소성 엘라스토머 조성물, 그의 발포 성형체, 그의 복합 성형체 및 자동차용 인스트루먼트 패널[과제] 충분한 발포성이 얻어지고, 또한 성형품의 외관이 양호한 발포용 열가소성 엘라스토머 조성물을 제공한다.[해결 수단] 부분적으로 또는 완전히 가교된 에틸렌, 탄소수 3~20의 α-올레핀 및 비공액 폴리엔으로 이루어지는 에틸렌·α-올레핀·비공액 폴리엔 공중합체 고무(A) 10~40중량%와, 에틸렌 및 탄소수 3~20의 α-올레핀으로 이루어지는 에틸렌·α-올레핀 공중합체(B) 3~33중량%와, DSC로 얻어지는 융점이 40~170℃인 폴리프로필렌(C) 10~40중량%와, 고무용 연화제(D) 10~45중량%와, 아이소택틱 프로필렌계 중합체(E-a) 1~30중량% 및 신디오택틱 α-올레핀계 공중합체(E-b) 1~20중량%로부터 선택되는 적어도 1종(성분(A), (B), (C), (D), 및 (E-a), (E-b)의 합계는 100중량%)을 함유하는 발포용 열가소성 엘라스토머 조성물.가교된 에틸렌, 탄소수 3~20의 α-올레핀 및 비공액 폴리엔으로 이루어지는 에틸렌·α-올레핀·비공액 폴리엔 공중합체 고무(A) 10~40중량%와, (a) 에틸렌으로부터 유도되는 구성 단위와 (b) 탄소수 3~20의 α-올레핀으로부터 유도되는 구성 단위를 65/35~95/5의 몰비로 함유하는 에틸렌 및 탄소수 3~20의 α-올레핀으로 이루어지는 에틸렌·α-올레핀 공중합체(B) 3~33중량%와, 시차 주사 열량 분석(DSC)으로 얻어지는 융점이 40~170℃인 폴리프로필렌(C) 10~40중량%와, 고무용 연화제(D) 10~45중량%와, 아이소택틱 프로필렌계 중합체(E-a) 1~30중량% 및 신디오택틱 α-올레핀계 공중합체(E-b) 1~20중량%로부터 선택되는 적어도 1종(단, 성분(A), (B), (C), (D), 및 (E-a), (E-b)의 합계를 100중량%로 한다)을 함유하는 발포용 열가소성 엘라스토머 조성물로서, 상기 성분(E-a)이 하기 (i)~(iv)를 만족하고: (i) 겔 투과 크로마토그래피(GPC)에 의해 측정된 분자량 분포(Mw/Mn)가 1~10; (ii) 프로필렌으로부터 유도되는 구성 단위가 40~85몰% 및 탄소수 2~20의 α-올레핀(프로필렌을 제외함)으로부터 유도되는 구성 단위가 60~15몰%; (iii) 용융 유량(MFR: ASTM D1238, 190℃, 2.16kg 하중)이 0.1~50g/10분; 및 (iv) 시차 주사 열량 분석(DSC)에서 융점이 관측되지 않음; 상기 성분(E-b)이, 프로필렌으로부터 유도되는 구성 단위(E-1)와, 에틸렌으로부터 유도되는 구성 단위(E-2)와, 탄소수 4~20의 올레핀으로부터 유도되는 구성 단위(E-3)와, 공액 폴리엔 또는 비공액 폴리엔으로부터 유도되는 구성 단위(E-4)를 포함하되, (E-1), (E-2) 및 (E-3)의 합계 100몰% 중, (E-1)을 30~79몰%, (E-2)를 1~30몰% 및 (E-3)을 10~50몰%(단, (E-2) 및 (E-3)의 합계를 21~70몰%로 한다)의 양으로 포함하고, (E-1), (E-2) 및 (E-3)의 합계 100몰%에 대하여 (E-4)를 0~30몰%의 양으로 포함하며, 1,2,4-트라이클로로벤젠 용액 중, 테트라메틸실레인을 기준 물질로 하여 성분(E-b)의 13C-NMR을 측정했을 때 20.0~21.0ppm에서 관측되는 프로필렌 단위의 메틸기의 흡수의 총합이, 19.0~22.0ppm에서 관측되는 프로필렌 단위의 메틸기의 흡수의 총합의 0.5배 이상인 것을 특징으로 하는 발포용 열가소성 엘라스토머 조성물.