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专利名称：Method and apparatus for the production of
thermoplastic caprolactam containingmolding compositions
发明人：Gerhard Illing申请号：US07/406199申请日：190911公开号：US05169582A公开日：19921208
摘要：In a method and apparatus for the production of thermoplastic, caprolactamcontaining molding compositions by hydrolytic polymerization of caprolactam in stirrerautoclaves in which a molten mass is polymerized at pressures of 5 to 20 bar andtemperatures of 220° to 280° C., the molten mass is transferred into an intermediatevessel to which vacuum is applied for continued polymerization and removal of volatileportions. Subsequently, the mass is continuously fed into a multi-screw extruder, in orderto attain at increased temperatures and vacuum the desired polymerization degree andthe desired monomer and oligomer contents. In a subsequent zone of the extruder,when desired, additional agents are worked in, whereafter a further degasification occursin the end zone of the extruder, whereafter the mass is extruded, quenched, subdividedand dried. The method and apparatus use relatively little energy as compared with theprior art.
申请人：EMS-INVENTA AG
代理机构：Jordan and Hamburg
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