| 摘要 |
PROBLEM TO BE SOLVED: To provide a block copolymer crum that is excellent in dissolubility with asphalt, tackifier, softener, etc., and in heat discoloration resistance.SOLUTION: The block copolymer crumb contains a block copolymer, or a hydrogenated product thereof, that contains a vinyl aromatic hydrocarbon unit and a conjugated diene unit, and satisfies the following requirements: (1) the melt viscosity at 150°C and 100 smeasured by capillograph is 1.0×10to 1.0×10Pa s, (2) the component passing through a sieve having an opening of 2.0 mm and not passing through a sieve having an opening of 0.6 mm is 50 mass% or more of the whole crumb, and furthermore, the component passing through a sieve having an opening of 0.6 mm is 10 mass% or less of the whole crumb, (3) the specific surface area is 0.05 to 0.30 m/g, and (4) the porosity is 0.01 to 0.20, and the voids having a diameter of 100 μm or more occupy 0.2 to 15 vol.% of the total voids.SELECTED DRAWING: None |
