| 摘要 |
A viscous block copolymer of the formula: (A-B-Ap)n-Yr-(Aq-B)m wherein Y is a coupling agent or coupling monomers, and wherein A and B are polymer blocks which may be homopolymer blocks of conjugated diene monomers, copolymer blocks of conjugated diene monomers or copolymer blocks of conjugated diene monomers and monoalkenyl aromatic hydrocarbon monomers, and wherein the A blocks have a greater number of di- and/or tetra-substituted unsaturation sites per unit of block mass than do the B blocks, wherein the number of tertiary unsaturation (TU) sites in the A blocks is lower than or equal to that number of the B blocks and wherein the A blocks have a molecular weight from 100 to 3000 and the B blocks have a molecular weight from 1000 to 15,000, and wherein p and q are 0 or 1 and n > 0, r is 0 or 1, m >/= 0 and n + m ranges from 1 to 100. |
