Patent ID: 6143832
Filing Date: 2000-11-07
Classification: C08F

Abstract:
An aromatic vinyl-conjugated diene block copolymer composed of a bound aromatic vinyl unit and a bound conjugated diene unit and containing at least a block aromatic vinyl segment, wherein:(1) a content of the bound aromatic vinyl unit in the block copolymer is 5 to 60 wt. %;(2) a molecular weight (A-Mp) corresponding to a peak in a molecular weight distribution curve of the block aromatic vinyl segment (A) as determined by gel permeation chromatography (GPC) is 80,000 to 300,000;(3) a proportion of block aromatic vinyl segment portions having a molecular weight at most a third of the molecular weight (A-Mp) corresponding to the peak in the molecular weight distribution curve of the block aromatic vinyl segment (A) as determined by GPC is 55 to 70 mol % based on the total content of the block aromatic vinyl segment (A); and(4) a molecular weight (Mp) corresponding to a peak in a molecular weight distribution curve of the block copolymer as determined by GPC is 100,000 to 600,000.