Patent ID: 6852806
Filing Date: 2005-02-08
Classification: C08F,Y10T

Abstract:
1. A hydrogenated copolymer obtained by hydrogenating an unhydrogenated copolymer comprising conjugated diene monomer units and vinyl aromatic monomer units, said unhydrogenated copolymer having at least one polymer block (H) of vinyl aromatic monomer units, said hydrogenated copolymer having the following characteristics (1) to (5): (1) a content of said vinyl aromatic monomer units of from more than 60% by weight to less than 90% by weight, based on the weight of said hydrogenated copolymer, (2) a content of said polymer block (H) of from 1 to 40% by weight, based on the weight of said unhydrogenated copolymer, (3) a weight average molecular weight of from more than 100,000 to 1,000,000, (4) a hydrogenation ratio of 85% or more, as measured with respect to the double bonds in said conjugated diene monomer units, and (5) substantially no crystallization peak observed at −50 to 100° C. in a differential scanning calorimetry (DSC) chart obtained with respect to said hydrogenated copolymer.