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    Process for the preparation of granular oxymethylene polymers having improved mechanical properties
    1.
    发明授权
    Process for the preparation of granular oxymethylene polymers having improved mechanical properties 失效
    具有改进的机械性能的颗粒状甲醛聚合物的制备方法

    公开(公告)号：US4195158A

    公开(公告)日：1980-03-25

    申请号：US931985

    申请日：1978-08-08

    申请人： Karlheinz Burg ,  Alwin Heller ,  Hans-Dieter Sabel ,  Helmut Schlaf ,  Gunter Sextro

    发明人： Karlheinz Burg ,  Alwin Heller ,  Hans-Dieter Sabel ,  Helmut Schlaf ,  Gunter Sextro

    IPC分类号： C08J3/14 ,  C08J3/12 ,  C08G2/28

    CPC分类号： C08J3/12 ,  C08J2359/02

    摘要： Oxymethylene polymers (POM) are obtained in a granular form, by cooling a POM solution or dispersion, whose temperature is above the sintering temperature of the POM, to a temperature slightly below the sintering temperature of the POM, and extracting from the suspension obtained only those POM particles which show a grain diameter of more than 70 .mu.m. As solvent or dispersing agent as well as precipitating and cooling agent there is used a mixture of methanol and water with a methanol content of at least 75% by weight. The POM obtained is suitable as engineering plastic material for the manufacture of shaped articles having improved mechanical properties.

    摘要翻译： 通过将温度高于POM的烧结温度的POM溶液或分散体冷却至略低于POM的烧结温度的温度，并从仅获得的悬浮液中提取，得到颗粒状的甲醛聚合物（POM） 那些显示出超过70μm的粒径的POM颗粒。 作为溶剂或分散剂以及沉淀和冷却剂，使用甲醇和水的混合物，甲醇含量至少为75重量％。 获得的POM适用于制造具有改进的机械性能的成形制品的工程塑料材料。

    Process for preparing oxymethylene polymers in a granular form
    4.
    发明授权
    Process for preparing oxymethylene polymers in a granular form 失效
    制备颗粒形式的甲醛聚合物的方法

    公开(公告)号：US4151346A

    公开(公告)日：1979-04-24

    申请号：US872441

    申请日：1978-01-26

    申请人： Gunter Sextro ,  Karlheinz Burg ,  Helmut Schlaf ,  Hans J. Leugering ,  Alwin Heller

    发明人： Gunter Sextro ,  Karlheinz Burg ,  Helmut Schlaf ,  Hans J. Leugering ,  Alwin Heller

    IPC分类号： C08J3/12 ,  C08G2/22 ,  C08G2/28 ,  C08G16/02

    CPC分类号： C08J3/12 ,  C08J3/14 ,  C08J3/16 ,  C08J2359/02

    摘要： Oxymethylene polymers are obtained in a granular form by cooling a solution or dispersion of an oxymethylene polymer, the temperature of which solution or dispersion is above the sintering temperature of the oxymethylene polymer, to a temperature just below the sintering temperature of the oxymethylene polymer. As dissolving or dispersing agent as well as precipitating and cooling agent there is used a mixture of methanol and water having a methanol content of at least 75% by weight. The oxymethylene polymer obtained is suitable as engineering plastic for preparing moulded articles.

    摘要翻译： 通过将甲醛聚合物的溶液或分散体（其溶液或分散体的温度高于甲醛聚合物的烧结温度）冷却到刚好低于甲醛聚合物的烧结温度的温度，获得了颗粒形式的甲醛聚合物。 作为溶解或分散剂以及沉淀和冷却剂，使用具有至少75重量％的甲醇含量的甲醇和水的混合物。 所得到的甲醛聚合物适用于制备模塑制品的工程塑料。