| 摘要 |
PROBLEM TO BE SOLVED: To obtain a hydrogenated block copolymer having excellent solvent resistance, resistance to natural shrinkage, low-temperature shrinkability, rigidity, or the like, excellent balance of physical properties such as blocking resistance, warm water fusion resistance, impact resistance, and suitable for a heat-shrinkable film slightly having fish eyes (FE) caused by gel. SOLUTION: The hydrogenated block copolymer has the weight ratio of a vinylaromatic hydrocarbon to a conjugated diene of 60/40-95/5 and 30,000-500,000 number-average molecular weight by gel permeation chromatography (GPC) measurement. The block ratio of the vinylaromatic hydrocarbon incorporated in the hydrogenated block copolymer is 10-98. In the vinylaromatic hydrocarbon polymer block in the hydrogenated block copolymer, the ratio of the vinylaromatic hydrocarbon polymer block having≤35,000 molecular weight is <40 wt.% of the total of the vinylaromatic hydrocarbon polymer block. COPYRIGHT: (C)2005,JPO&NCIPI |
