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。