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    • 7. 发明申请
    • STYRENE POLYMERIZATION PROCESS
    • 苯乙烯聚合方法
    • WO1995017438A1
    • 1995-06-29
    • PCT/US1993012491
    • 1993-12-21
    • KELLEY, Joseph, M.
    • C08F04/38
    • C08F279/04C08F12/08C08F279/02C08F212/08
    • An improved process for the polymerization of the styrene is provided. The process comprises feeding styrene monomer (1) and a mixture of peroxides (3), which decompose at progressively higher temperatures, into a prepolymerization vessel (1) maintained at 200-270 DEG F. About 20-40 % of the styrene in this vessel is converted to polymer (depending on temperature and residence time) and then fed to an extruder (5) where the polymer is raised in temperature by passage throught a heat exchanger (4) or through the heated throat of the extruder (5). During this heating, the polymerization is completed in seconds to minutes in an extruder (5) as the peroxides decompose in sequence as the temperature rises. A final devolatilization zone (6) is provided to remove the final traces of monomer. The molten polymer is then passed through a die (7) and stranded or hot die face cut. In like manner, this process can be used to produce styrene-acrylonitrile copolymers by the addition, prior to prepolymerization, of acrylonitrile to the prepolymerization vessel (1), impact polystyrene by the addition of rubber to the styrene in a dissolver (12) and ABS by the addition of rubber and acrylonitrile to the styrene in a dissolver (12) prior to prepolymerization.
    • 提供了改进的苯乙烯聚合方法。 该方法包括将苯乙烯单体(1)和在逐渐升高的温度下分解的过氧化物(3)的混合物加入到保持在200-270°F的预聚合容器(1)中。该方法中约20-40%的苯乙烯 将容器转化成聚合物(取决于温度和停留时间),然后进料到挤出机(5)中,其中聚合物通过热交换器(4)或通过挤出机(5)的加热喉道在温度下升高。 在这种加热过程中,当挤出机(5)中的过氧化物随着温度升高而依次分解时,聚合在几分钟内完成。 提供最终的脱挥发区(6)以除去最终痕量的单体。 然后将熔融的聚合物通过模具(7)并且被切割或绞合或热模切面。 以类似方式,该方法可用于通过在预聚合之前将丙烯腈加入到预聚合容器(1)中,通过在溶解器(12)中向苯乙烯中加入橡胶来冲击聚苯乙烯来生产苯乙烯 - 丙烯腈共聚物,以及 ABS通过在预聚合之前在溶解器(12)中向苯乙烯中加入橡胶和丙烯腈。