To provide a hydrogenated block copolymer suitable for injection molded products, sheets and heat-shrinkable films and having excellent physical property balance of solvent resistance, natural shrinkability, low-temperature shrinkability, rigidity, transparency and elongation, etc., and to provide a composition thereof.
The hydrogenated block copolymer has the following. (60/40) to (95/5) weight ratio of a vinyl aromatic hydrocarbon to a conjugated diene, 30,000-500,000 number-average molecular weight measured by GPC (gel permeation chromatography), 20-100 wt.% of block ratio of the vinyl aromatic hydrocarbon integrated into the hydrogenated block copolymer, 0.75-1 ratio (E40/E20) of the storage modulus (E40) at 40°C temperature to the storage modulus (E20) at 20°C temperature, at least one peak temperature of a function tanδ of dynamic rheological measurement of the hydrogenated block copolymer present within the range of 70-125°C and ≥60% hydrogenation ratio.
YAMAURA YUKIO
| JP2005105032A | 2005-04-21 | |||
| JPH11158241A | 1999-06-15 | |||
| JP2005068317A | 2005-03-17 |
Shinji Oga
Toshifumi Onuki
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