Patent ID: 6699941
Filing Date: 2004-03-02
Classification: C08F

Abstract:
A hydrogenated block copolymer having a hard phase and a soft phase, the general configuration beingAâ€”B, Aâ€”Bâ€”A, Aâ€”Bâ€”Aâ€², Aâ€”Bâ€”C or (Aâ€”B)nX, where n is an integer from 2 to about 30, and X is coupling agent residue and wherein a. prior to hydrogenation each A and Aâ€² block is a random copolymer block of a mono alkenyl arene monomer and a 1,3-cyclodiene monomer, each B block is a polymer block of at least one acyclic conjugated diene and each C block is a polymer block of a mono alkenyl arene; b. subsequent to hydrogenation about 0-10% of the arene double bonds have been reduced, at least about 90% of the conjugated diene double bonds have been reduced, and at least about 90% of the 1,3-cyclodiene double bonds have been reduced; c. each A, Aâ€² and C block having an average molecular weight between about 3,000 and about 60,000 and each B block having an average molecular weight between about 30,000 and about 300,000; d. the weight ratio of the alkenyl arene monomer and the cyclodiene monomer in each A and Aâ€² block prior to hydrogenation is between 1:1 to 99:1; e. the total amount of A plus Aâ€² plus C blocks is about 10 percent weight to about 80 percent weight of the block copolymer; and f. the glass transition temperature of the hard phase of the block copolymer is in excess of 105 degrees Celsius.