Hydrogenated diene block copolymer and composition comprising the same

Abstract

A hydrogenated diene block copolymer having a polystyrene-reduced number-average molecular weight of 50,000-600,000 which is a hydrogenation product of an (A)--(B) block copolymer in which (A) means an alkenyl aromatic compound polymer block and (B) means a conjugated diene homopolymer block wherein the vinyl content of the conjugated diene portion is more than 60%, or an alkenyl aromatic compound-conjugated diene random copolymer block wherein the vinyl content of the conjugated diene portion is 15% or more, an (A)--(B)--(C) block copolymer in which (A) and (B) are as defined above and (C) means an alkenyl aromatic compound-conjugated diene copolymer tapered block wherein the proportion of the alkenyl aromatic compound increases gradually, or an (A)--(B)--(A) block copolymer in which (A) and (B) are as defined above, in which block copolymer (1) the weight proportion of theh alkenyl aromatic compound/the conjugated diene is 5/95 to 60/40, and (2) the content of the bound alkenyl aromatic compound in at least one block (A) is at last 3% by weight and the total of the bound alkenyl aromatic compound contents in the block (A) and the block (C) or the two block (A)'s is 3-50% by weight based on the total monomers, and in which hydrogenation product at least 80% of the double bonds of the conjugated diene portion is saturated by the hydrogenation. Said hydrogenated diene block copolymer is useful as a modifier for polar resins, non-polar resins or both of them.

Dependencies are inferred from the claim text.