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    • 2. 发明授权
    • Synthesis of styrene-isoprene rubber
    • 苯乙烯 - 异戊二烯橡胶的合成
    • US06313216B1
    • 2001-11-06
    • US09654176
    • 2000-09-01
    • Scott McDowell ChristianZhengfang XuMichael Lester Kerns
    • Scott McDowell ChristianZhengfang XuMichael Lester Kerns
    • C08L906
    • C08C19/44C08F236/10C08F2/001
    • This invention discloses a process for synthesizing random styrene-isoprene rubber comprising: (1) continuously charging isoprene, styrene, an initiator, and a solvent into a first polymerization zone, (2) allowing the isoprene and styrene to copolymerize in the first polymerization zone to total conversion of 60 to 95 percent to produce a polymer cement containing living styrene-isoprene chains, (3) continuously charging the polymer cement containing living styrene-isoprene chains and additional isoprene monomer into a second polymerization zone, wherein from 5 to 40 percent of the total amount of isoprene changed is charged into the second polymerization zone, (4) allowing the copolymerization to continue in the second polymerization zone to a conversion of the isoprene monomer of at least 90 percent wherein the total conversion of styrene and isoprene in the second polymerization zone is limited to a maximum of 98 percent, (5) withdrawing a polymer cement of random styrene-isoprene rubber having living chain ends from the second reaction zone, (6) killing the living chain ends on the random styrene-isoprene rubber, and (7) recovering the random styrene-isoprene rubber from the polymer cement, wherein the copolymerizations in the first polymerization zone and the second polymerization zone are carried out at a temperature which is within the range of 70° C. to 100° C., and wherein the amount of styrene charged into the first polymerization zone is at least 2 percent more than the total amount of styrene bound into the rubber.
    • 本发明公开了一种合成无规苯乙烯 - 异戊二烯橡胶的方法,包括:(1)将异戊二烯,苯乙烯,引发剂和溶剂连续加入到第一聚合区中,(2)使异戊二烯和苯乙烯在第一聚合区 总共转化率为60%至95%,以生产含有活性苯乙烯 - 异戊二烯链的聚合物水泥,(3)将含有活性苯乙烯 - 异戊二烯链和其它异戊二烯单体的聚合物水泥连续加入到第二聚合区中,其中5-40% 改变的异戊二烯的总量加入到第二聚合区中,(4)使第二聚合区中的共聚合继续至至少90%的异戊二烯单体的转化率,其中苯乙烯和异戊二烯的总转化率 第二聚合区域限制在最大值98%,(5)取出无规苯乙烯 - 异戊二烯的聚合物水泥 (6)杀死无规苯乙烯 - 异戊二烯橡胶上的活性链末端,和(7)从聚合物水泥中回收无规苯乙烯 - 异戊二烯橡胶,其中第一次聚合中的共聚合 区域,第二聚合区域在70℃至100℃范围内的温度下进行,并且其中装入第一聚合区域中的苯乙烯的量比总量多至少2% 的苯乙烯结合到橡胶中。