| 摘要 |
The invention provides a process for the continuous polymerization of a polymer comprising monomeric units derived from styrene and 1,3-butadiene, said process comprising:
polymerizing the monomers in the presence of an initiator, and at least one polar agent selected from Formula 1;;wherein R1 and R2 are each independently an alkyl, and preferably a C1-C4 alkyl; R3, R4, R5, R6, R7 and R8 are each independently selected from hydrogen or an alkyl, and preferably hydrogen or a C1-C4 alkyl;and wherein a 1,2-diene is added to the polymerization, and the 1,2-diene to active initiator (active for polymerization) molar ratio is from 0.1 to 1.0, preferably from 0.1 to 0.9, and more preferably from 0.1 to 0.85; andwherein the polar agent to the active initiator molar ratio is from 0.05 to 0.6, preferably from 0.1 to 0.5, more preferably from 0.15 to 0.3.;The invention also provides a composition comprising a polymer comprising monomeric units derived from styrene and 1,3-butadiene, and wherein the polymer has at least the following characteristics:
A) vinyl content from 12 to 40 weight percent, based on the weight of polymerized butadiene in the polymer,B) block styrene content less than 8 weight percent, based on the weight of styrene in the polymer, andC) a styrene content from 10 to 50 weight percent, based on the weight of the polymer. |
| 主权项 |
1. A process for the continuous polymerization of a polymer comprising monomeric units derived from styrene and 1,3-butadiene, said process comprising:
polymerizing the monomers in the presence of an initiator, and at least one polar agent selected from Formula 1;Formula 1,
wherein R1 and R2 are each independently an alkyl, and preferably a C1-C4 alkyl; R3, R4, R5, R6, R7 and R5 are each independently selected from hydrogen or an alkyl, and preferably hydrogen or a C1-C4 alkyl; and wherein a 1,2-diene is added to the polymerization, and the 1,2-diene to active initiator molar ratio is from 0.1 to 1.0; and wherein the polar agent to the active initiator molar ratio is from 0.05 to 0.6. |
