Thermoplastic elastomer composition and modifier composition using the same

1. A thermoplastic elastomer composition comprising:

1) a thermoplastic vulcanized olefin elastomer (A),

2) an aromatic vinyl random copolymer (B), and

3) a block copolymer (D) having

a) a thermoplastic block (1) composed of either a block copolymer having an aromatic vinyl block and a conjugated diene block, or a hydrogenated product thereof, and

b) a thermoplastic block (2) of a thermoplastic polymer containing one or more functional groups selected from the group consisting of oxygen-containing functional groups, nitrogen-containing functional groups and sulfur-containing functional groups,

wherein the (A) component is a thermoplastic vulcanized elastomer composed of an ethylene-α-olefin copolymer (A-1) and a thermoplastic non-vulcanizable polymer (A-2), and the (A) component is vulcanized by a vulcanizing agent (E),

wherein the (A-1) component is an ethylene-α-olefin copolymer comprising ethylene and a C 3 to C 20 α-olefin, produced using a metallocene catalyst,

wherein the (A-2) component is at least one thermoplastic non-vulcanizable polymer selected from the group of:

a) a polyphenylene ether,

b) an olefin resin, and

c) an aromatic vinyl resin,

wherein the (B) component is a hydrogenated copolymer rubber composed mainly of random bonding which has an olefinic double bond hydrogenation ratio of 50% or more and comprises 10 to 49% by weight of a conjugated diene monomer and 51 to 90% by weight of an aromatic vinyl monomer,

wherein the (A) component consists of 1 to 99% by weight of the (A-1) component and 1 to 99% by weight of the (A-2) component based on 100% by weight of the (A) component,

wherein the proportion of the (A) component is 1 to 99 parts by weight based on the total 100 parts by weight of the (A) and (B) components, and

wherein the proportion of the (D) component is 1 to 100 parts by weight based on the total 100 parts by weight of the (A) and (B) components.