Patent ID: 6239218
Filing Date: 2001-05-29
Classification: C08F,C08L,G03F

Abstract:
A hydrogenated block copolymer comprising:two polymer blocks A mainly comprising vinylaromatic hydrocarbon compound monomer units; andtwo polymer blocks B mainly comprising hydrogenated conjugated diene compound monomer units, in which at least 90% of the olefinically unsaturated double bonds contained in the unhydrogenated polymer block mainly comprising the conjugated diene compound monomer units is hydrogenated,wherein the hydrogenated block copolymer has a block arrangement of A-B-A-B,wherein the proportion of said terminal polymer block B in the hydrogenated block copolymer being 0.1% by weight or higher and lower than 9.1% by weight,wherein the content of said vinylaromatic hydrocarbon compound units in the hydrogenated block copolymer is 12% by weight or higher and lower than 25% by weight,wherein said conjugated diene compound monomer is butadiene, and the unhydrogenated polymer blocks mainly comprising butadiene monomer units have a 1,2-bond content higher than 50 mol % and lower than 90 mol %, andwherein the hydrogenated block copolymer has an order-disorder transition temperature of 260.degree. C. or lower.