Patent ID: 7704676
Filing Date: 2010-04-27
Classification: B41N,C08F,C08L,C09J,G03F

Abstract:
1. An elastomeric block copolymer comprising a molecular structure according to the general formula: wherein each A is independently a polymer block of predominantly an aromatic vinyl compound, each I is predominantly isoprene, each B is predominantly butadiene, n is an integer equal to or greater than 2, and X is the residue of a coupling agent, and wherein: (i) the weight ratio of I to B is in a range of 30:70 to 70:30; (ii) the aromatic vinyl compound content of the block copolymer is 14 to 45 wt %; (iii) the B block has a 1,2-vinyl bond content in the range of from 30 to 60 mol %; (iv) the A block has an apparent molecular weight in the range of from 5,000 to 20,000, and the I and B blocks together have an apparent molecular weight in the range of from 50,000 to 200,000; and (v) the coupling efficiency of (A-I-B)