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    • 8. 发明授权
    • Alternating isoprene-ethylene copolymers and a process for the
preparation thereof
    • 交替异戊二烯 - 乙烯共聚物及其制备方法
    • US4288581A
    • 1981-09-08
    • US199071
    • 1980-10-20
    • Wolfgang WiederJosef Witte
    • Wolfgang WiederJosef Witte
    • C08F4/00C08F4/60C08F210/02C08F236/00C08F236/04C08F236/08C08F4/76
    • C08F210/02C08F236/08
    • The invention refers to Isoprene-ethylene copolymers having alternating monomer units in which the proportion of recurring-isoprene-ethylene-sequences is more than 80 mol %, in which the proportion of built-in isoprene in the 1,4-configuration is more than 80 mol % which consists of more than 70 mol % of a trans-arrangement, and in which less than 5 mol % of the built-in isoprene is present in the 3,4-configuration, the copolymers having a glass temperature of between -70.degree. C. and -90.degree. C., a Mooney-viscosity of between 30 and 150 [ML 1+4 (100.degree. C.)] and a viscosity number [.eta.], measured at 25.degree. C. in toluene, of between 0.5 and 6, and a process for their preparation characterized in that polymerization is carried out in solution at a temperature of between -80.degree. C. and +100.degree. C. in the presence of a catalyst system which consists of(a) a vanadium compound of the formula VO(OR).sub.2 X and(b) an organoaluminium compound of formula Al R'.sub.3, HAlR'.sub.2 or R'.sub.2 ALY whereinR represents an alkyl group containing from 1-20 carbon atoms,X represents a halogen atom,R'represents an alkyl group containing from 1 to 8 carbon atomsY represents a halogen atom; whereby the molar ratio of b:a is between 100:1 and 1:10.
    • 本发明涉及具有交替单体单元的异戊二烯 - 乙烯共聚物,其中重复 - 异戊二烯 - 乙烯序列的比例大于80mol%,其中1,4构型中内置异戊二烯的比例大于 80摩尔%,其由多于70摩尔%的反式排列组成,并且其中3,4构型中存在小于5摩尔%的内置异戊二烯,所述共聚物的玻璃温度介于 - 在70℃和-90℃下,在25℃在甲苯中测定的门尼粘度为30至150 [ML 1 + 4(100℃)]和粘度数η为 在0.5和6之间,其制备方法的特征在于在催化剂体系存在下,在-80℃至+ 100℃的温度下,在溶液中进行聚合,所述催化剂体系由(a) 式VO(OR)2 X的钒化合物和(b)式Al R'3,HA1R'2或R'2ALY的有机铝化合物,其中R代表 含有1-20个碳原子的烷基,X表示卤素原子,R'表示含有1至8个碳原子的烷基,Y表示卤素原子; 由此b:a的摩尔比在100:1和1:10之间。