Thermoplastic Elastomer Composition for Double Layer Molding, Double Layer Molded Article, and Method for Producing Double Layer Molded Article

2:

• The thermoplastic elastomer composition for double layer molding according to claim 1, wherein
• the hydrogenated block copolymer (a-2) has at least two polymer blocks A2 composed mainly of a vinyl aromatic monomer unit, and at least two polymer blocks B2 composed mainly of a conjugated diene monomer unit,
• at least one of the polymer blocks B2 is positioned at the end of the hydrogenated block copolymer (a-2), a content of the polymer block B2 positioned at the end is 1 to 10% by mass in the hydrogenated block copolymer (a-2), and
• the hydrogenated block copolymer (a-2) has no peak of a weight-average molecular weight of 250,000 or larger.

7:

• A double layer molded article having
• a polar group-containing thermoplastic resin layer, and
• a thermoplastic elastomer composition layer comprising a hydrogenated block copolymer (a), a polypropylene resin (b), and a non-aromatic softener (c), wherein
• the thermoplastic elastomer composition layer is disposed in contact with the polar group-containing thermoplastic resin layer,
• the hydrogenated block copolymer (a) contains no modifying group,
• the hydrogenated block copolymer (a)
• is a hydrogenated block copolymer which is a hydrogenated product of a block copolymer having a vinyl aromatic monomer unit and a conjugated diene monomer unit, and
• has one or more molecular weight peaks each from 30,000 to smaller than 150,000 and from 150,000 to 550,000 in GPC,
• a content of all vinyl aromatic monomer units in a hydrogenated block copolymer having the molecular weight peaks from 30,000 to smaller than 150,000 in GPC is 35% by mass to 70% by mass, and a vinyl bond content before hydrogenation in the conjugated diene monomer unit is 60% by mol to 95% by mol,
• a content of all vinyl aromatic monomer units in a hydrogenated block copolymer having the molecular weight peaks from 150,000 to 550,000 in GPC is 15% by mass to less than 35% by mass, and
• a degree of hydrogenation of double bonds in the conjugated diene monomer unit is 50% by mol or more.

8:

• The double layer molded article according to claim 7, wherein
• the hydrogenated block copolymer (a) consists of a hydrogenated block copolymer (a-1) and a hydrogenated block copolymer (a-2),
• the component (a-1) satisfies the following requirements (1-1) to (1-4),
• the component (a-2) satisfies the following requirements (2-1) to (2-6),
• the thermoplastic elastomer composition layer contains 100 parts by mass of the component (a-1), 10 to 100 parts by mass of the component (b), and 50 to 300 parts by mass of the component (c), and
• a content of the component (a-2) in the thermoplastic elastomer composition layer is 5 to 70% by mass based on the total amount of the components (a-1), (a-2), (b), and (c):
• (1-1):
• one or more polymer blocks A1 composed mainly of a vinyl aromatic monomer unit, and one or more polymer blocks B1 composed mainly of a conjugated diene monomer unit are contained,
• (1-2):
• a content of all vinyl aromatic monomer units is 15% by mass or more and less than 35% by mass,
• (1-3):
• a weight-average molecular weight is 150,000 to 550,000, and
• (1-4):
• 50% by mol or more of double bonds in the conjugated diene monomer unit are hydrogenated,
• (2-1):
• one or more polymer blocks A2 composed mainly of a vinyl aromatic monomer unit, and one or more polymer blocks B2 composed mainly of a conjugated diene monomer unit are contained,
• (2-2):
• a content of the vinyl aromatic monomer unit in the polymer block A2 is 50% by mass or more,
• (2-3):
• a content of all vinyl aromatic monomer units is 35% by mass to 70% by mass,
• (2-4):
• a weight-average molecular weight is 30,000 or larger and smaller than 150,000,
• (2-5):
• a vinyl bond content before hydrogenation in the conjugated diene monomer unit in the polymer block B2 is 60% by mol to 95% by mol, and
• (2-6):
• 50% by mol or more of double bonds in the conjugated diene monomer unit are hydrogenated.

9:

• The double layer molded article according to claim 8, wherein
• the hydrogenated block copolymer (a-2) has at least two polymer blocks A2 composed mainly of a vinyl aromatic monomer unit, and at least two polymer blocks B2 composed mainly of a conjugated diene monomer unit, at least one of the polymer blocks B2 is positioned at the end of the hydrogenated block copolymer (a-2), a content of the polymer block B2 positioned at the end is 1 to 10% by mass in the hydrogenated block copolymer (a-2),
• a content of all vinyl aromatic monomer units is more than 40% by mass and 70% by mass or less, and
• the hydrogenated block copolymer (a-2) has no peak of a weight-average molecular weight of 250,000 or larger.

14:

• A method for producing a double layer molded article according to claim 8, comprising the steps of:
• molding the polar group-containing thermoplastic resin to obtain a molded article;
• and
• injecting a thermoplastic elastomer composition according to claim 13 to a gap part between the mold and the molded article in a state in which the molded article is placed in the mold, followed by thermal fusion bonding.