| 摘要 |
<p>It is intended to provide a hydrogenation product of a block copolymer which is a hydrogenation of a block copolymer having a weight ratio of an aromatic vinyl hydrocarbon to a conjugated diene of from 55/45 to 95/5, a number-average molecular weight measured by gel permeation chromatography (GPC) of from 30,000 to 500,000 and a hydrogenation ratio of 30% or more, is suitably usable in sheets and heat-shrinkable films being excellent in solvent resistance, rigidity, elongation and transparency and has well-balanced physicochemical properties, wherein the degree of blocking in the aromatic vinyl hydrocarbon contained in the hydrogenated product is from 60 to 98% by weight, the ratio of aromatic vinyl hydrocarbon polymer blocks having a molecular weight of 50,000 or less to the total aromatic vinyl hydrocarbon polymer blocks is 80% by weight or more, the ratio of aromatic vinyl hydrocarbon polymer blocks having a molecular weight of 15, 000 or less is from 10 to 80% by weight, and at least one peak temperature of the function tanH in measuring the dynamic viscoelasticity of the hydrogenation product occurs in the scope exceeding-80°C but lower than-10°C, and a composition of the hydrogenation product of the block copolymer.</p> |
