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    Method of stabilizing polyoxymethylene copolymer
    1.
    发明授权
    Method of stabilizing polyoxymethylene copolymer 失效
    稳定聚甲醛共聚物的方法

    公开(公告)号：US4814424A

    公开(公告)日：1989-03-21

    申请号：US120314

    申请日：1987-11-13

    Applicant: Takeo Suzumori ,  Isamu Masumoto ,  Mitsuo Nakagawa ,  Yukihiro Iha

    Inventor： Takeo Suzumori ,  Isamu Masumoto ,  Mitsuo Nakagawa ,  Yukihiro Iha

    IPC: C08G59/30 ,  C08G2/18 ,  C08G2/28 ,  C08G2/30 ,  C08G2/36 ,  C08G2/26

    CPC classification number: C08G2/36

    Abstract: An improved method of stabilizing a polyoxymethylene copolymer, which comprises(1) heat-melting a crude copolymer of trioxane and a cyclic ether and/or a cyclic acetal to form a first stabilized copolymer having a decomposition ratio (D.sub.220.sup.60), determined when it is heated at 220.degree. C. for 60 minutes in vacuum, of up to 2% by weight, and then(2) bringing the first stabilized copolymer into contact with steam containing 0.01 to 5% by weight of a basic compound at a temperature of at least 100.degree. C. but not exceeding the melting point of the copolymer to form a second stabilized copolymer.

    Abstract translation: 一种稳定聚甲醛共聚物的改进方法，其包括（1）将三恶烷和环醚和/或环缩醛的粗共聚物加热熔融以形成具有分解比（D22060）的第一稳定共聚物，当其为 在220℃下真空加热60分钟，最多达2重量％，然后（2）使第一稳定的共聚物与含有0.01至5重量％碱性化合物的蒸汽在温度为 至少100℃，但不超过共聚物的熔点以形成第二稳定的共聚物。

    Process for the production of oxymethylene copolymer molding compositions with a low content of residual formaldehyde
    2.
    发明授权
    Process for the production of oxymethylene copolymer molding compositions with a low content of residual formaldehyde 失效
    用于生产具有低残留甲醛含量的甲醛共聚物模塑组合物的方法

    公开(公告)号：US4225703A

    公开(公告)日：1980-09-30

    申请号：US74766

    申请日：1979-09-11

    Applicant: Herbert Amann ,  Gerhard Morlock ,  Hellmut Trautwein

    Inventor： Herbert Amann ,  Gerhard Morlock ,  Hellmut Trautwein

    IPC: C08G2/00 ,  C08G2/18 ,  C08G2/28 ,  C08G2/36 ,  C08L51/04

    CPC classification number: C08G2/36 ,  C08G2/28

    Abstract: Oxymethylene copolymers molding compositions with low portions of residual formaldehyde are produced by heating the polymerizate melts treated with chemical stabilizers in an apparatus in which there are continuously presented new polymerizate surfaces under reduced pressure. The heating of the polymerizate melt takes place in a thin layer evaporator for highly viscous media during an average residence time of 30 to 120 seconds at an average rate of shear between 500 and 2000 s.sup.-1 and at a pressure P.sub.abs of at most 150 mbar. The escaping gases and vapors are drawn off countercurrent to the polymerizate melt.

    Abstract translation: 通过在减压下连续提供新的聚合物表面的装置中加热用化学稳定剂处理的聚合物熔体来制备具有低部分残余甲醛的甲醛共聚物模塑组合物。 聚合物熔体的加热在用于高粘度介质的薄层蒸发器中进行，平均停留时间为30至120秒，平均剪切速率为500至2000s -1，压力Pabs至多为150mbar 。 逸出的气体和蒸气与聚合物熔体逆流排出。

    Process for the preparation of polymeric acetal carboxylates
    6.
    发明授权
    Process for the preparation of polymeric acetal carboxylates 失效
    制备聚合缩醛羧酸盐的方法

    公开(公告)号：US4226960A

    公开(公告)日：1980-10-07

    申请号：US86895

    申请日：1979-10-22

    Applicant: David R. Dyroff ,  Victor D. Papanu

    Inventor： David R. Dyroff ,  Victor D. Papanu

    IPC: C08G2/14 ,  C08G2/36 ,  C08F283/06 ,  C08L61/02

    CPC classification number: C08G2/36 ,  C08G2/14

    Abstract: The alkali metal, ammonium and alkanol ammonium salts of polymeric acetal carboxylates are stable detergent builders under laundry use conditions but depolymerize at lower pH, making the polymer fragments more readily biodegradable in waste streams. Such polymeric acetal carboxylates can now be made by an improved process which includes the steps of bringing together in a reaction zone under polymerization conditions an ester of glyoxylic acid and a polymerization initiator, and adding an alkyl vinyl ether to the resulting polymer in the presence of a solvent having a dielectric constant of at least 15, such as an alkyl nitrile and a haloacetic acid catalyst, such as trifluoroacetic acid, to stabilize the polymer against rapid depolymerization in alkaline solution. The preferred solvent is acetonitrile.

    Abstract translation: 聚合缩醛羧酸盐的碱金属，铵和烷醇铵盐在洗衣使用条件下是稳定的洗涤剂助洗剂，但在较低pH下解聚，使聚合物碎片在废物流中更容易生物降解。 现在可以通过改进的方法制备这种聚缩醛羧酸盐，该方法包括以下步骤：在聚合反应条件下将乙醛酸和聚合引发剂的酯聚合在反应区中，并在所得聚合物存在下加入烷基乙烯基醚 具有至少15的介电常数的溶剂，例如烷基腈和卤代乙酸催化剂如三氟乙酸，以稳定聚合物以防止碱溶液中的快速解聚。 优选的溶剂是乙腈。

    Process for preparing a stabilized oxymethylene copolymer
    7.
    发明授权
    Process for preparing a stabilized oxymethylene copolymer 失效
    制备稳定的甲醛共聚物的方法

    公开(公告)号：US4024105A

    公开(公告)日：1977-05-17

    申请号：US551235

    申请日：1975-02-20

    Applicant: Gunter Sextro ,  Karlheinz Burg ,  Ernst Wolters

    Inventor： Gunter Sextro ,  Karlheinz Burg ,  Ernst Wolters

    IPC: C08L59/00 ,  C08G2/00 ,  C08G2/18 ,  C08G2/36 ,  C08K5/09 ,  C08K5/098 ,  C08G2/32 ,  C08G2/10

    CPC classification number: C08G2/36 ,  C08K5/098

    Abstract: Oxymethylene copolymer having heat and hydrolysis resistant terminal groups is prepared by heating the polymers present in a liquid phase, whereby a thermal degradation of the unstable terminal groups takes place. The degradation is advantageously effected in the presence of a calcium or magnesium salt of an aliphatic carboxylic acid of low molecular weight. The oxymethylene copolymers are suitable as engineering plastic for preparing semi-finished products and finished products.

    Abstract translation: 通过加热存在于液相中的聚合物来制备具有耐热和耐水解端基的亚甲基共聚物，由此发生不稳定末端基团的热降解。 降解有利地在低分子量的脂族羧酸的钙盐或镁盐的存在下进行。 甲醛共聚物适用于制备半成品和成品的工程塑料。

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