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    • 10. 发明申请
    • Process for the Preparation of Oxymethylene Polymers and Apparatus Suitable for This Purpose
    • 制备甲醛聚合物的方法和适用于此目的的设备
    • US20090264615A1
    • 2009-10-22
    • US12423653
    • 2009-04-14
    • Michael HaubsEberhard MannJurgen Lingnau
    • Michael HaubsEberhard MannJurgen Lingnau
    • C08G65/02C08G2/12
    • C08G2/04C08G2/24
    • A process and an apparatus for the preparation of oxymethylene polymers is described. The process encompasses the polymerization of a monomer that forms oxymethylene groups, if appropriate in the presence of a cyclic acetal, together with an acetal of formaldehyde and with an initiator for cationic polymerization, preferably in a gas-tight kneader or extruder. The temperature profile of the polymerization here is designed in such a way that the polymerization mixture, which is initially heterogeneous by virtue of precipitating polymer, is converted to a homogeneous phase at the end of the polymerization. The homogeneous phase in which the polymer is present in liquid form is stabilized via addition of deactivators.After removal of volatile constituents, oxymethylene polymers are obtained with high thermal stability and with good mechanical properties.The oxymethylene polymers can be prepared at low energy cost and their properties can be adjusted as desired via prescription of the temperature profile during the polymerization.
    • 描述了制备甲醛聚合物的方法和装置。 该方法包括在环状缩醛存在下适当形成甲醛基团的单体以及甲缩醛和阳离子聚合引发剂,优选在气密捏合机或挤出机中的聚合。 这里聚合的温度分布是这样设计的,即在聚合结束时,通过沉淀聚合物最初是非均相的聚合混合物被转化为均匀相。 聚合物以液体形式存在的均相是通过加入失活剂来稳定的。 除去挥发性成分后,得到具有高热稳定性和良好机械性能的甲醛聚合物。 甲醛聚合物可以以低能量成本制备,并且可通过在聚合过程中处理温度曲线来根据需要调节其性能。