Diene polymers having reduced hysteresis and improved raw viscosity incorporating primary partial coupling and terminals formed from vinyl compounds containing heterocyclic nitrogen groups
申请人:BRIDGESTONE CORPORATION
公开号:EP0538789A1
公开(公告)日:1993-04-28
Diene polymers or copolymers having improved raw polymer viscosity, good processability in carbon black reinforced stocks and reduced hysteresis in the cured and carbon black reinforced state are provided. These diene polymers or copolymers comprise a mixture of diene polymer or copolymer chains containing carbon-tin bonds in the main polymer or copolymer chains and diene polymer or copolymer chains containing terminals derived from vinyl-compounds containing heterocyclic nitrogen groups having the structural formula:
Wherein R₁ and R₂ are selected from the groups consisting of H, alkyl, alkylaryl, aryl and O,N-containing alkyl, alkylaryl, and aryl groups and wherein X is a radical selected from the group consisting of
Wherein R₃, R₄, R₅, R6, R7, and R₈ are selected from the group consisting of H, alkyl, alkylaryl, aryl and O,N-containing alkyl, alkylaryl and aryl groups.
The diene polymer or copolymers are prepared by first coupling a portion of the living diene polymer or copolymer chains obtained by anionic polymerization using a tin polyhalide coupling agent and then terminating the remaining living diene polymer or copolymer chains using vinyl compounds containing heterocyclic nitrogen groups. The resultant diene polymers or copolymers have improved raw polymer viscosity and when compounded with carbon black have good processability in the uncured state and reduced hysteresis in the cured state. The polymers can be utilized to form elastomer compositions for tire treads having reduced rolling resistance.
本发明提供的二烯聚合物或共聚物具有更高的聚合物原材料粘度,在炭黑增强浆料中具有良好的加工性能,在固化和炭黑增强状态下具有更低的滞后性。这些二烯聚合物或共聚物包括在聚合物或共聚物主链中含有碳-锡键的二烯聚合物或共聚物链,以及含有由结构式为杂环氮基团的乙烯基化合物衍生的末端的二烯聚合物或共聚物链的混合物:
其中 R₁和 R₂ 选自 H、烷基、烷芳基、芳基和含 O、N 的烷基、烷芳基和芳基组成的基团,其中 X 是选自以下组成的基团: H、烷基、烷芳基、芳基和含 O、N 的烷基、烷芳基和芳基。
其中 R₃、R₄、R₅、R6、R7 和 R₈ 选自由 H、烷基、烷芳基、芳基和含 O、N 的烷基、烷芳基和芳基组成的组。
二烯聚合物或共聚物的制备方法是:先用聚卤化锡偶联剂偶联阴离子聚合得到的部分活的二烯聚合物或共聚物链,然后用含有杂环氮基团的乙烯基化合物终止剩余的活的二烯聚合物或共聚物链。由此得到的二烯聚合物或共聚物具有更好的原始聚合物粘度,与炭黑复合后在未固化状态下具有良好的加工性,在固化状态下可减少滞后性。这些聚合物可用于形成弹性体组合物,用于降低滚动阻力的轮胎胎面。