Process for stripping monomers and other volatile constituents from polymer melts
    2.
    发明授权
    Process for stripping monomers and other volatile constituents from polymer melts 失效
    从聚合物熔体中提取单体和其他挥发性成分的方法

    公开(公告)号:US07060788B2

    公开(公告)日:2006-06-13

    申请号:US11002396

    申请日:2004-12-02

    IPC分类号: C08F6/00

    摘要: A process for stripping volatile constituents from polymer melts is disclosed. The process entails introducing the polymer melt into a horizontally oriented cylindrical device that contains a plurality of perforated disks rotating about a common horizontally oriented, externally driven shaft bringing the melt and disks into contact in a manner calculated to constantly renew the surface of the melt to be stripped. Also disclosed is an apparatus suitable for the process.

    摘要翻译: 公开了从聚合物熔体中汽提挥发性成分的方法。 该方法需要将聚合物熔体引入到水平取向的圆柱形装置中,该装置包含围绕公共水平取向的外部驱动的轴旋转的多个多孔板,使得熔体和盘以计算为不断更新熔体表面的方式接触 剥离。 还公开了适用于该方法的装置。

    Transesterification process for the production of polycarbonates having a low content of volatile compounds
    3.
    发明授权
    Transesterification process for the production of polycarbonates having a low content of volatile compounds 有权
    用于生产挥发性化合物含量低的聚碳酸酯的酯交换方法

    公开(公告)号:US07279544B2

    公开(公告)日:2007-10-09

    申请号:US11002866

    申请日:2004-12-02

    IPC分类号: C08G64/00

    CPC分类号: C08G64/307

    摘要: A multi stage process for the production of polycarbonates having low monomer content is disclosed. The process entails, in sequence, (i) transesterifying in the melt at least one dihydroxyaryl compound with at least one diaryl carbonate in the presence of at least one onium catalyst to produce a polycondensate that contains monomers, (ii) introducing into the polycondensate an inhibitor in an hypostoichiometric amount in relation to the catalyst and (iii) reducing in a finishing reactor the content of monomers in said polycondensate. The polycarbonate thus produced is characterized in that it contains less than 350 ppm of diphenyl carbonate, less than 40 ppm of 2,2-bis-(4-hydroxyphenyl)propane and less than 150 ppm of phenol.

    摘要翻译: 公开了一种生产具有低单体含量的聚碳酸酯的多阶段方法。 该方法按顺序进行,(i)在至少一种鎓催化剂的存在下,使至少一种二羟基芳基化合物与至少一种碳酸二芳基酯在至少一种二羟基芳基化合物中酯交换以产生含有单体的缩聚物,(ii)将所述缩聚物引入到缩聚物中 抑制剂相对于催化剂的低化学计量量,和(iii)在精整反应器中还原所述缩聚物中单体的含量。 如此生产的聚碳酸酯的特征在于其含有少于350ppm的碳酸二苯酯,小于40ppm的2,2-双 - (4-羟基苯基)丙烷和小于150ppm的苯酚。

    Extruder with integrated die plate and method for degasing polymer mixtures
    5.
    发明授权
    Extruder with integrated die plate and method for degasing polymer mixtures 有权
    具有集成模板的挤出机和用于脱胶聚合物混合物的方法

    公开(公告)号:US09023983B2

    公开(公告)日:2015-05-05

    申请号:US13811330

    申请日:2011-07-22

    摘要: The invention is directed to an extruder (10), particularly for extruding a synthetic rubber product, which comprises a barrel (24), one or several extruder elements (12, 14), particularly one or several extruder screws and/or a kneader elements (14), arranged inside the barrel (24) for conveying the product, optionally an inlet port for feeding a stripping agent into the barrel (24) and an outlet port for removing volatile compounds from the product and, where applicable, the stripping agent. According to the invention a perforated die plate (26) is fixed to the barrel (24) in flow direction before the outlet port. Since the die plate (26) is not fixed to the extruder elements (12, 14) but to the barrel (24) a circumferential clearance between the die plate (26) and the barrel (24) is prevented so that no extruded material is passing the die plate (26) radially outside. Parts of the extruded material comprising a low surface area to volume ratio are prevented so that the evaporation of volatile compounds is facilitated.

    摘要翻译: 本发明涉及挤出机(10),特别是用于挤出合成橡胶产品,其包括桶(24),一个或多个挤出机元件(12,14),特别是一个或多个挤出机螺杆和/或捏合元件 (14),布置在所述筒体(24)内用于输送所述产品,任选地用于将汽提剂进料到所述筒体(24)中的入口和用于从所述产品中除去挥发性化合物的出口端口,以及在适用的情况下,所述汽提剂 。 根据本发明,穿孔模板(26)在出口之前沿流动方向固定到筒体(24)。 由于模板(26)不固定到挤出机元件(12,14)而是固定到筒体(24)上,因此防止了模板(26)和筒体(24)之间的周向间隙,使得不挤出材料 径向地穿过模板(26)。 防止包含低表面积与体积比的挤出材料的部分,从而促进挥发性化合物的蒸发。