| abstract |
A polymer composition comprising modified polymers according to the following Formula 1 and Formula 2: ** (See formula) ** where each of P1 and P2 is independently a polymer chain that can be obtained by anionic polymerization of one or more monomers polymerizable agents selected from conjugated dienes and aromatic vinyl compounds, where each polymer chain P1 and P2 contains at least 40% by weight of repeating units obtained by the polymerization of said conjugated dienes, and where at least the anionic polymerization for the chain Polymer P1 is carried out in the presence of a compound of the following Formula 9a: ** (See formula) ** where each R31 is independently selected from hydrogen, (C1-C10) alkyl, aryl (C6-C12) and aralkyl (C7 - 20 C18); each R32, R33 and R34 is independently selected from hydrogen, (C1-C18) alkyl and (C1-C18) alkoxy; each R41 is independently selected from (C1-C100) alkyl and alkenyl (C2-C100), where each R41 is optionally substituted with one to three aryl groups (C6-C12) and is optionally attached to the structure of Formula 9a to through an oligomeric chain composed of up to 25 monomer units selected from conjugated dienes, especially 1,3-butadiene and isoprene, and aromatic vinyl compounds, especially styrene and divinylbenzene; each M2 is independently selected from lithium, sodium and potassium; and k, l and q are whole numbers independently selected from 0, 1, 2 and 3; A1, A2 and A3 are independently selected from the following Formula 3 to Formula 8: ** (See formula) ** where each R1 is independently selected from (C1-C16) alkyl; each R2 is independently selected from (C1-C16) alkyl, aryl (C6-C18) and aralkyl (C7-C18); a and b are whole numbers independently selected from 0, 1 and 2, with a + b> = 2; .... |