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    • 5. 发明授权
    • Process for preparation of block copolymers in mixed alkane/cycloalkane solvents
    • 在混合烷烃/环烷烃溶剂中制备嵌段共聚物的方法
    • US06242536B1
    • 2001-06-05
    • US08988925
    • 1997-12-11
    • James E. HallDaniel F. GravesHideo Takeichi
    • James E. HallDaniel F. GravesHideo Takeichi
    • C08F29300
    • C08F297/04
    • The dispersibility of the initial polystyrene block in forming a S-B-S type of copolymer is improved by first preparing a small block of homopolydiene such as homopolybutadiene as a dispersing agent. Onto this small block of homopolybutadiene, the first block of polystyrene is formed and affixed and thereby made dispersible in a mixture of alkanes and 15 to 60% by weight of cycloalkanes, preferably hexane and cyclohexane. After the preparation of the dispersing agent and the first styrene block, the remaining monomer charges to the reactor are fed in aliphatic hydrocarbon diluents, preferably hexane or technical hexane, thereby greatly reducing the final percentage of cycloalkanes including cyclohexane in the reactor to less than 25% of total dispersing medium. The block copolymers produced according to the present process display a narrow molecular weight distribution and improved tensile strength over block copolymers produced in the absence of the additional cycloalkanes in the solvent system.
    • 初始聚苯乙烯嵌段在形成S-B-S型共聚物中的分散性通过首先制备均聚二烯如小聚丁二烯作为分散剂的小块来改善。 在该小块均聚丁二烯上,形成第一块聚苯乙烯并固化,从而使其分散在烷烃和15至60重量%的环烷烃,优选己烷和环己烷的混合物中。 在分散剂和第一苯乙烯嵌段的制备之后,向脂肪烃稀释剂(优选己烷或工业己烷)中将进料到反应器中的剩余单体进料进料,从而大大降低反应器中包括环己烷在内的环烷烃的最终百分比至小于25 总分散介质的百分比。 根据本发明制备的嵌段共聚物在溶剂体系中不存在另外的环烷烃时产生的嵌段共聚物显示窄的分子量分布和改进的拉伸强度。