Patent ID: 6632890
Filing Date: 2003-10-14
Classification: C08F,C08L,C09D

Abstract:
A hydrogenated block copolymer comprising at least two distinct blocks of hydrogenated vinyl aromatic polymer, and at least one block of hydrogenated conjugated diene polymer, characterized by:a) a total number average molecular weight (Mnt) of from 30,000 to 120,000, wherein each hydrogenated vinyl aromatic polymer block (A) has a Mna of from 5,000 to 50,000 and the hydrogenated conjugated diene polymer block (B) has a Mnb of from 4,000 to 110,000; and b) a hydrogenation level such that each hydrogenated vinyl aromatic polymer block has a hydrogenation level of greater than 90 percent and the hydrogenated conjugated diene polymer block has a hydrogenation level of greater than 95 percent; wherein the hydrogenated block copolymer comprises at least 65 weight percent of hydrogenated vinyl aromatic polymer block, based on the total weight of the block copolymer.