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    Production of a water-absorbing resin to which a particulate additive is admixed
    73.
    发明授权
    Production of a water-absorbing resin to which a particulate additive is admixed 有权
    生产混合有微粒添加剂的吸水性树脂

    公开(公告)号：US07786211B2

    公开(公告)日：2010-08-31

    申请号：US12158502

    申请日：2006-12-28

    申请人： Uwe Stueven ,  Rüdiger Funk ,  Matthias Weismantel ,  Thomas Daniel ,  Annemarie Hillebrecht ,  Dominicus van Esbroeck ,  Karl J. Possemiers

    发明人： Uwe Stueven ,  Rüdiger Funk ,  Matthias Weismantel ,  Thomas Daniel ,  Annemarie Hillebrecht ,  Dominicus van Esbroeck ,  Karl J. Possemiers

    IPC分类号： C08G18/63

    CPC分类号： C08F2/44 ,  C08F220/06 ,  C08F222/1006

    摘要： The invention relates to a process for producing a water-absorbing resin by polymerization of a reaction mixture comprising at least one hydrophilic monomer and, if appropriate, at least one crosslinker in a reactor, which comprises admixing the reaction mixture with at least one first portion of a particulate additive before the reaction mixture has reached a residence time of 40% of the overall residence time in the reactor and with at least one second portion of a particulate additive when the reaction mixture has reached a residence time of 45% or more of the overall residence time in the reactor, the additive being selected from water-absorbing resin powders, fillers and mixtures thereof, the total solids content of monomer and additive being in the range from 30% to 60% by weight, the amount of additive being in the range from 5% to 50% by weight, based on the monomers, and the weight ratio of the first portion to the second portion of the additive being in the range from 10:1 to 1:5. The resin powder is recycled fine-sized material for example. Not only the residual monomer content, specifically the residual crosslinker content, but also the level of extractables in the water-absorbing resin are reduced by the method of addition described. A high fraction of additives can be incorporated without the properties of the water-absorbing resin obtained being adversely affected. The additives enter a sufficiently firm bond with the resin, so that no excessive dusting occurs on exposure to mechanical stress.

    摘要翻译： 本发明涉及通过聚合包含至少一种亲水单体和如果合适的反应器中至少一种交联剂的反应混合物来生产吸水树脂的方法，其包括将反应混合物与至少一个第一部分 的反应混合物在反应混合物的停留时间达到总反应器停留时间的40％的停留时间和至少一个第二部分的颗粒状添加剂之前，当反应混合物达到45％或更多的停留时间时， 在反应器中的总停留时间，添加剂选自吸水树脂粉末，填料及其混合物，单体和添加剂的总固体含量在30重量％至60重量％的范围内，添加剂的量为 基于单体的5重量％至50重量％的范围，并且添加剂的第一部分与第二部分的重量比在10:1至 1：5。 树脂粉末是例如再循环的精细尺寸的材料。 通过所述的添加方法，不仅残留单体含量，特别是残留交联剂含量，而且吸水性树脂中的可萃取物的含量都降低。 可以并入高分数的添加剂，而不会对获得的吸水性树脂的性能产生不良影响。 添加剂与树脂进行足够牢固的粘合，使得在暴露于机械应力时不会发生过度的除尘。

    Production of Water-Absorbent Resins
    74.
    发明申请
    Production of Water-Absorbent Resins 审中-公开
    吸水树脂的生产

    公开(公告)号：US20100197877A1

    公开(公告)日：2010-08-05

    申请号：US12669916

    申请日：2008-08-08

    申请人： Rüdiger Funk ,  Wilfried Heide ,  Matthias Weismantel ,  Ulrich Hammon ,  Andrea Karen Bennett

    发明人： Rüdiger Funk ,  Wilfried Heide ,  Matthias Weismantel ,  Ulrich Hammon ,  Andrea Karen Bennett

    IPC分类号： C08F120/06

    CPC分类号： C08F220/06

    摘要： What is described is a process for producing water-absorbing resins, in which a) acrylic acid is prepared at an acrylic acid production site, b) the acrylic acid prepared is dissolved in water at the acrylic acid production site to obtain an aqueous acrylic acid solution, c) the aqueous acrylic acid solution is fed into a pipeline at the acrylic acid production site and passed through the pipeline to an acrylic acid processing site and d) the aqueous acrylic acid solution is subjected to a free-radical polymerization at the acrylic acid processing site. The process ensures safe transport of the highly reactive acrylic acid. Endangerment as a result of premature polymerization, as in the case of glacial acrylic acid, is ruled out, since the acrylic acid is “diluted” by the aqueous solvent and the specific heat capacity and the evaporation enthalpy of the water limit the maximum temperature rise. The amount of polymerization inhibitors used be reduced or it is possible to entirely dispense with polymerization inhibitors. Temperature control of vessels and pipelines within which the aqueous acrylic acid solution is conducted can be dispensed with because the solidification point of the aqueous acrylic acid solution is lower than that of anhydrous acrylic acid.

    摘要翻译： 描述的是一种生产吸水树脂的方法，其中a）在丙烯酸生产部位制备丙烯酸，b）将制备的丙烯酸溶解在丙烯酸生产部位的水中，得到含水丙烯酸 溶液，c）丙烯酸水溶液进料到丙烯酸生产现场的管道中，通过管道进入丙烯酸加工现场，并且d）丙烯酸水溶液在丙烯酸处理下进行自由基聚合 酸加工现场。 该方法确保高反应性丙烯酸的安全运输。 由于丙烯酸被水性溶剂“稀释”，所以比例热容量和水的蒸发焓限制了最大温度上升，因此排除了由于过早聚合而导致的过早聚合的结果，如在丙烯酸的情况下 。 使用的聚合抑制剂的量减少，或者可以完全省去聚合抑制剂。 由于丙烯酸水溶液的固化点低于无水丙烯酸的固化点，所以可以省去进行丙烯酸水溶液的容器和管道的温度控制。