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公开(公告)号:US20050239995A1
公开(公告)日:2005-10-27
申请号:US11105678
申请日:2005-04-14
申请人: Jorg Kirchhoff , Thomas Konig , Klemens Kohlgruber , Steffen Kuhling , Melanie Mothrath , Dirk Meirvenne
发明人: Jorg Kirchhoff , Thomas Konig , Klemens Kohlgruber , Steffen Kuhling , Melanie Mothrath , Dirk Meirvenne
CPC分类号: C08G64/205 , C08G64/307
摘要: The invention describes a process for the preparation of polycarbonate. The process includes (a) transesterifying at least one aromatic dihydroxyaryl compound and a diaryl carbonate in the melt in the presence of a catalyst, (b) mixing the melt obtained in step (a) with a foaming agent (c) passing the mixture at 250 to 340° C. through inlet openings of a separating vessel at a rate of 0.1 to 20 kg/hour, to obtain a plurality of streams of foamed polycarbonate and degassing the streams of foamed polycarbonate in the separating vessel wherein the pressure is 0.1 to 20 mbar.
摘要翻译: 本发明描述了制备聚碳酸酯的方法。 该方法包括(a)在催化剂存在下,在熔体中将至少一种芳族二羟基芳基化合物和碳酸二芳基酯酯交换反应,(b)将步骤(a)中获得的熔体与通过该混合物的发泡剂(c) 通过分离容器的入口开口以0.1至20kg /小时的速度通过入口开口250至340℃,以获得多个发泡聚碳酸酯流并在分离容器中对发泡聚碳酸酯流进行脱气,其中压力为0.1至 20毫巴
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公开(公告)号:US20050043500A1
公开(公告)日:2005-02-24
申请号:US10954428
申请日:2004-09-30
CPC分类号: C08J5/18 , C08J2369/00 , C08L69/00 , Y10T428/31504 , Y10T428/31507
摘要: Polycarbonate substrates having low concentration of defects are disclosed. The substrates are suitable for producing molded articles characterized by low cloudiness.
摘要翻译: 公开了具有低浓度缺陷的聚碳酸酯基材。 该基材适用于生产特征为低混浊的模制品。
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