| 摘要 |
The present invention provides a block copolymer composition comprising a block copolymer A represented by formula (A) and a block copolymer B represented by formula (B), the block copolymer composition having a water content of 200 ppm by weight or less when the block copolymer composition has been formed in a shape of pellets, dried, and allowed to stand at a temperature of 37°C and a relative humidity of 70% for 24 hours. In the formulas, Ar1 a , Ar1 b , and Ar2 b are aromatic vinyl polymer blocks having a weight average molecular weight of 6,000-18,000, Ar2 a is an aromatic vinyl polymer block having a weight average molecular weight of 40,000-400,000, and D a and D b are specific conjugated diene polymer blocks. The block copolymer composition has a high modulus of elasticity, exhibits low tension set, and ensures that the formation of a hole is prevented when a film is formed by melt-forming the block copolymer composition.
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒAr1 a -D a -Ar2 a €ƒ€ƒ€ƒ€ƒ€ƒ(A)
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒAr1 b -D b -Ar2 b €ƒ€ƒ€ƒ€ƒ€ƒ(B) |
