| 摘要 |
<p>A hydrogenated block copolymer which is made up of at least two polymer blocks A consisting mainly of vinylaromatic hydrocarbon compound units and at least two polymer blocks B consisting mainly of hydrogenated butadiene units and in which the polymer blocks B each has a degree of hydrogenation of 90 % or higher, characterized in that at least one of the terminal blocks is a polymer block B, all the terminal polymer blocks B account for 0.1 to 9.1 wt.%, excluding 9.1 wt.%, of the whole copolymer, the vinylaromatic hydrocarbon compound units account for 10 to 25 wt.%, excluding 10 and 25 wt.%, of the whole copolymer, the polymer blocks B before hydrogenation had a 1,2-bond content of 62 to 99 mol%, excluding 99 mol%, on the average, and the copolymer, when added to an isotactic propylene homopolymer, lowers the crystallization initiation temperature thereof by 1.5 °C or more. A resin composition is also provided which comprises the copolymer and a polypropylene resin.</p> |
