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    • 7. 发明申请
    • Process for Preparing Polyoxymethtylene Homopolymers or Copolymers
    • 制备聚氧乙烯均聚物或共聚物的方法
    • US20080234459A1
    • 2008-09-25
    • US12064893
    • 2006-08-25
    • Neven LangKnut ZollnerAchim StammerElmar Stockelmann
    • Neven LangKnut ZollnerAchim StammerElmar Stockelmann
    • C08G65/08
    • C08G2/10C07D323/06C08G2/28Y02P20/582
    • A process for preparing polyoxymethylene homopolymers or copolymers by homopolymerization or copolymerization of trioxane or additionally of suitable comonomers, in which trioxane which still comprises residual monomers is firstly prepared in a monomer plant and is degassed in one or more stages to give one or more vapor streams (13, 14) which are, if appropriate, fed to a condenser (K) in which the condensable fractions of these vapor streams are condensed to give a condensate (15) which is recycled to the polymerization reactor (P) and one or more gaseous, formaldehyde-comprising streams (16) and also a partially degassed polyoxymethylene homopolymer or copolymer (17) which is fed to an extruder (E) or kneader and is mixed with customary additives and processing aids in this to give a polymer melt (19) and extraction of a formaldehyde-comprising extruder or kneader offgas (18) from the extruder (E) or kneader, wherein the formaldehyde-comprising secondary streams (14, 16, 18) from the polymer plant are recycled directly without addition of auxiliaries to the monomer plant, is proposed
    • 通过三恶烷或另外合适的共聚单体的均聚或共聚制备聚甲醛均聚物或共聚物的方法,其中仍然包含残余单体的三恶烷首先在单体植物中制备,并在一个或多个阶段中脱气以产生一种或多种蒸气流 (13,14),如果合适的话,它们被供给到冷凝器(K),在该冷凝器(K)中这些蒸汽流的可冷凝馏分被冷凝,得到一个冷凝物(15),其被循环到聚合反应器(P)和一个或多个 气态的含甲醛的物流(16),以及部分脱气的聚甲醛均聚物或共聚物(17),其被输送到挤出机(E)或捏合机中,并与常规添加剂和加工助剂混合,得到聚合物熔体(19 )和从挤出机(E)或捏合机中提取含甲醛的挤出机或捏合机废气(18),其中含甲醛的二次流(14,16 ,18)从聚合物植物中直接回收而不添加助剂到单体植物