Patent ID: 7625979

Claim:
A block copolymer composition comprising: a. a tetra-branched black copolymer (IV) having a number avenge molecular weight of 100,000 to 800,000 represented by the general formula (A-B)4X; b. a tri-branched block copolymer (III) having a number avenge molecular weight of from 75,000 to 600,000 represented by the general formula (A-B)3X; c. a di-branched block copolymer (II) having a number average molecular weight of from 50,000 to 400,000 represented by the general formula (A-B)2X; and d. a linear diblock copolymer (I) having a number average molecular weight of from 25,000 to 200,000 represented by the general formula A-B; where: i. A represents a polymer block of a mono alkenyl arene; ii. B represents a polymer block of a conjugated diene selected from the group consisting essentially of butadiene and mixtures of isoprene and butadiene; iii. X represents the residue of an alkoxy silane coupling agent having the formula Rx-Si—(OR′) y , where x is 0 or 1, x+y=4, R and R′ are the same or different, R is selected from aryl hydrocarbon radicals, linear alkyl hydrocarbon radicals and branched alkyl hydrocarbon radicals, and R′ is selected from linear and branched alkyl hydrocarbon radicals; and iv. the relative amounts of copolymers I, II, III and IV are from 0 to 5 weight percent IV, from 0 to 60 weight percent III, from 40 to 95 weight percent II and from 2 to 10 weight percent 1, where the total of I, II, III and IV equals 100 weight percent.