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    Process for heat stabilizing oxymethylene copolymers
    1.
    发明授权
    Process for heat stabilizing oxymethylene copolymers 失效
    热稳定甲醛共聚物的方法

    公开(公告)号：US4366305A

    公开(公告)日：1982-12-28

    申请号：US322249

    申请日：1981-11-17

    申请人： Akira Amemiya ,  Tadashi Kunii ,  Tomotaka Furusawa ,  Mutsuhiko Takeda ,  Katsumasa Tanaka ,  Toshikazu Umemura ,  Yoshihiro Ono ,  Isamu Masumoto ,  Noriyasu Nakao ,  Masanori Furukawa

    发明人： Akira Amemiya ,  Tadashi Kunii ,  Tomotaka Furusawa ,  Mutsuhiko Takeda ,  Katsumasa Tanaka ,  Toshikazu Umemura ,  Yoshihiro Ono ,  Isamu Masumoto ,  Noriyasu Nakao ,  Masanori Furukawa

    IPC分类号： C08G2/00 ,  C08G2/18 ,  C08G2/30 ,  C08G2/36 ,  C08G2/28

    CPC分类号： C08G2/36 ,  C08G2/00 ,  C08G2/18 ,  B29C2947/92019 ,  B29C2947/92066 ,  B29C2947/92314 ,  B29C2947/924

    摘要： In a process for producing a stabilized oxymethylene copolymer by heat-melting, at a temperature ranging between the melting point of the copolymer and a temperature 100.degree. C. higher than the melting point in a degassing apparatus in the presence of a heat stabilizer, a crude oxymethylene copolymer of trioxane with a cyclic acetal or cyclic ether, to decompose and eliminate the instable portions of the copolymer, the improvement which comprises using as the degassing apparatus in heat stabilizing the crude oxymethylene copolymer a combination of (A) an extruder and (B) a surface renewing-type mixer, and carrying out the operation by first feeding a crude oxymethylene copolymer to said extruder (A) to heat-melt and decompose 30-90% by weight of the instable portions of the crude copolymer, removing the decomposed gas via a vent provided in said extruder, and thereafter introducing the molten resin continuously to said surface renewing-type mixer (B) where substantially all of the remaining instable portions of the oxymethylene copolymer are heat-decomposed until the content of the instable portions falls below about 2 wt. %, thereby heat stabilizing the copolymer; said extruder (A) having a single or a plurality of shafts, said surface renewing-type mixer functioning to mix and knead the resin thereby constantly renewing the surface of the resin to volatize the volatiles contained therein.

    摘要翻译： 在通过热熔制备稳定化的甲醛共聚物的方法中，在热稳定剂存在下，在共聚物的熔点和高于脱气装置中的熔点的温度范围内的温度范围内， 三恶烷与环缩醛或环醚的粗甲醛共聚物分解和消除共聚物的不稳定部分，其改进包括使用（A）挤出机和（A）挤出机的组合来将粗甲醛共聚物热稳定化作为脱气装置， B）表面更新型混合机，通过首先将粗甲醛共聚物进料到所述挤出机（A）进行加热熔融分解30-90重量％的粗共聚物的不稳定部分，除去 通过设置在所述挤出机中的排气口分解气体，然后将熔融树脂连续地引入到所述表面更新型混合器（B），其中基本上所有的再生 甲醛共聚物的不稳定部分被热分解直到不稳定部分的含量低于约2重量％。 ％，从而使共聚物热稳定化; 所述挤出机（A）具有单个或多个轴，所述表面更新型混合器用于混合和捏合树脂，从而不断地更新树脂的表面以挥发其中所含的挥发物。

    Process for stabilizing oxymethylene copolymers
    2.
    发明授权
    Process for stabilizing oxymethylene copolymers 失效
    稳定甲醛共聚物的方法

    公开(公告)号：US4301273A

    公开(公告)日：1981-11-17

    申请号：US153674

    申请日：1980-05-27

    申请人： Akitoshi Sugio ,  Akira Amemiya ,  Tadashi Kunii ,  Tomotaka Furusawa ,  Mutsuhiko Takeda ,  Katsumasa Tanaka ,  Toshikazu Umemura

    发明人： Akitoshi Sugio ,  Akira Amemiya ,  Tadashi Kunii ,  Tomotaka Furusawa ,  Mutsuhiko Takeda ,  Katsumasa Tanaka ,  Toshikazu Umemura

    IPC分类号： B01F7/04 ,  B01F15/06 ,  B01J3/00 ,  B01J19/20 ,  C08G2/00 ,  C08G2/18 ,  C08G2/30 ,  C08G2/36 ,  C08G2/28

    CPC分类号： B01J3/006 ,  B01F15/065 ,  B01F7/042 ,  B01J19/20 ,  C08G2/00 ,  C08G2/36

    摘要： In a process for producing a stabilized oxymethylene copolymer which comprises heat-melting an oxymethylene copolymer having unstable, unblocked terminals obtained by the copolymerization of trioxane with a cyclic acetal and/or a cyclic ether to heat decompose it in the presence of available heat stabilizers; the improvement which comprises heating said oxymethylene copolymer having unblocked terminals in a mixer at a temperature between the melting point of said oxymethylene copolymer and a point 100.degree. C. higher than said melting point under a pressure of 0.1 mmHg to a atmospheric pressure for a mean residence time of 5 to 60 minutes, said mixer comprising a casing, a jacket for heating medium fitted over its external wall, and at least two stirring shafts equipped with a plurality of scraping blades disposed in said casing, said stirring shafts being capable of rotating in the same or different directions, and in the meantime, rotating said stirring shafts of said mixer to heat decompose said oxymethylene copolymer while renewing the surface of the molten oxymethylene copolymer.

    摘要翻译： 在制备稳定化的甲醛共聚物的方法中，该方法包括将具有不稳定的未封端末端的甲醛共聚物进行加热熔融，其通过三恶烷与环状缩醛和/或环醚的共聚得到，以在可用的热稳定剂存在下将其分解; 改进之处在于，在混合器中将所述具有未封端末端的甲醛共聚物在所述甲醛共聚物的熔点和高于所述熔点的高于所述熔点的100℃的温度下在0.1mmHg的压力下加热至平均气压 停留时间为5至60分钟，所述混合器包括壳体，装配在其外壁上的加热介质的护套，以及至少两个配备有设置在所述壳体中的刮刀的搅拌轴，所述搅拌轴能够旋转 在相同或不同的方向上，并且同时旋转所述混合器的所述搅拌轴以使所述甲醛共聚物分解，同时更新熔融的甲醛共聚物的表面。

    Process for continuously polymerizing trioxane
    4.
    发明授权
    Process for continuously polymerizing trioxane 失效
    连续聚合三恶烷的方法

    公开(公告)号：US4343929A

    公开(公告)日：1982-08-10

    申请号：US200065

    申请日：1980-10-23

    申请人： Akitoshi Sugio ,  Kazuyoshi Taka ,  Akira Amemiya ,  Tomotaka Furusawa ,  Mutsuhiko Takeda ,  Katsumasa Tanaka ,  Toshikazu Umemura ,  Yoshihiro Ono

    发明人： Akitoshi Sugio ,  Kazuyoshi Taka ,  Akira Amemiya ,  Tomotaka Furusawa ,  Mutsuhiko Takeda ,  Katsumasa Tanaka ,  Toshikazu Umemura ,  Yoshihiro Ono

    IPC分类号： B01J19/20 ,  C08G2/00 ,  C08G2/10 ,  C08G2/18

    CPC分类号： C08G2/00 ,  B01J19/20 ,  C08G2/10 ,  C08G2/18 ,  B01J2219/00779 ,  B01J2219/182

    摘要： A process for producing a polyacetal homopolymer or copolymer which comprises continuously feeding a liquid starting mixture containing molten trioxane and a catalyst and optionally a comonomer through a feed opening of a reactor, said reactor being a continuously stirring-type mixer having two stirring shafts having a plurality of plate-like paddles fixed thereto the cross-section of each of said paddles taken perpendicularly of the axial direction of the stirring shaft having a shape of a convex lens, an ellipse or a quasipolygon inscribing a phantom circle at each vertex, one of said paddles facing another paddle fixed to the other stirring shaft and said one paddle being positioned such that it rotates while the edges thereof keep a slight clearance from the inner surface of the barrel and the other paddle; polymerizing the starting mixture while moving it toward the discharge opening by the rotation of the paddles, the improvement wherein the profiles of the paddles are changed, or the arrangement of the paddles is changed continuously or stepwise, so that the transportability of the reaction mixture becomes progressively smaller from the feed opening toward the discharge opening of the reactor.

    摘要翻译： 一种制备聚缩醛均聚物或共聚物的方法，其包括通过反应器的进料口连续地供给含有熔融三恶烷和催化剂和任选的共聚单体的液体起始混合物，所述反应器是具有两个搅拌轴的连续搅拌型混合器， 多个板状的叶片固定在其上，垂直于搅拌轴的轴向垂直于每个顶点形成凸透镜，椭圆形或准圆体的形状的每个顶板上的假体圆的横截面， 所述桨叶面向固定到另一个搅拌轴的另一个桨叶，并且所述一个桨叶定位成使得其旋转，同时其边缘保持与筒体和另一个桨叶的内表面的微小间隙; 使起始混合物通过桨叶的旋转而朝向排出口移动而聚合起始混合物，改进了桨叶的轮廓改变，或者桨叶的排列被连续或逐步地改变，使得反应混合物的输送性变为 从进料口向反应器的排出口逐渐变小。

    Method for mixing raw materials for producing oxymethylene copolymers
    6.
    发明授权
    Method for mixing raw materials for producing oxymethylene copolymers 失效
    用于混合生产甲醛共聚物的原料的方法

    公开(公告)号：US4224435A

    公开(公告)日：1980-09-23

    申请号：US48178

    申请日：1979-06-13

    申请人： Akitoshi Sugio ,  Akira Amamiya ,  Tadashi Kunii ,  Tomotaka Furusawa ,  Mutsuhiko Takeda ,  Katsumasa Tanaka ,  Toshikazu Umenura ,  Kiyokazu Kawaguchi

    发明人： Akitoshi Sugio ,  Akira Amamiya ,  Tadashi Kunii ,  Tomotaka Furusawa ,  Mutsuhiko Takeda ,  Katsumasa Tanaka ,  Toshikazu Umenura ,  Kiyokazu Kawaguchi

    IPC分类号： B01J4/00 ,  C08G2/00 ,  C08G2/10 ,  C08G2/18

    CPC分类号： C08G2/18 ,  B01J4/001 ,  C08G2/00

    摘要： In a method for mixing a trioxane, a polymerization catalyst and a comonomer for producing of oxymethylene copolymers by continuously copolymerizing trioxane with a cyclic ether or a cyclic acetal as a comonomer, the improved method comprises following steps:spouting a comonomer and a polymerization catalyst from nozzle openings which are set adjacent to each other,while washing both openings at the tip end of the nozzles with a flow of trioxane,whereby mixing said comonomer, said polymerization catalyst and said trioxane,and then feeding the mixture to a polymerization reactor to effect copolymerization.The raw materials are mixed together before they are fed to the polymerization reactor, and no clogging trouble at the tip end of the nozzle for feeding a polymerization catalyst occurs. Further the resulting copolymer has a much superior heat stability. In addition, since each of the reaction raw materials is quantititively fed, the molecular weight and conversion of the copolymer extended from the polymerization reactor is so constant that a stabilized operation of the polymerization reactor can be secured.

    摘要翻译： 在通过将三恶烷与环醚或环状缩醛连续共聚作为共聚单体的三恶烷，聚合催化剂和用于制备甲醛共聚物的共聚单体的方法中，改进的方法包括以下步骤：将共聚单体和聚合催化剂从 喷嘴开口彼此相邻设置，同时用三恶烷流洗涤喷嘴前端的两个开口，由此混合所述共聚单体，所述聚合催化剂和所述三恶烷，然后将混合物进料到聚合反应器中以实现 共聚。 在将原料进料到聚合反应器中之前将原料混合在一起，并且不会在用于进料聚合催化剂的喷嘴的前端发生堵塞问题。 此外，所得共聚物具有非常优异的热稳定性。 此外，由于每个反应原料都是定量供料的，从聚合反应器中延伸的共聚物的分子量和转化率是恒定的，从而可以确保聚合反应器的稳定运行。