Process for the production of thermoplastic polycarbonates
    1.
    发明授权
    Process for the production of thermoplastic polycarbonates 失效
    用于生产热塑性聚碳酸酯的方法

    公开(公告)号:US5373082A

    公开(公告)日:1994-12-13

    申请号:US155309

    申请日:1993-11-19

    CPC分类号: C08G64/30

    摘要: A process for the production of polycarbonates by melt transesterification is disclosed. Accordingly, polycarbonate waste is dissolved in monophenols and at an elevated temperature and in the presence of a catalyst degraded to yield oligocarbonates, diaryl carbonates and diphenols. Following the optional separation of fillers and other additives there is produced by partial recondensation and the distillation of monophenol a higher viscosity oligocarbonate having a OH and aryl carbonate terminal groups and a weight average molecular weight of 8000 to 18000, the oligocarbonate thus produced is then polycondensed to form a polycarbonate resin.

    摘要翻译: 公开了通过熔融酯交换法生产聚碳酸酯的方法。 因此,将聚碳酸酯废物溶解在单酚中并在升高的温度下并在催化剂存在下降解以产生低聚碳酸酯,碳酸二芳基酯和二酚。 在填充剂和其它添加剂的任选分离之后,通过部分重新缩合和单酚蒸馏产生具有OH和芳基碳酸酯末端和重均分子量为8000至18000的较高粘度的低聚碳酸酯,然后将如此生产的低聚碳酸酯进行缩聚 以形成聚碳酸酯树脂。

    Improved transesterification process for the production of polycarbonates
    5.
    发明授权
    Improved transesterification process for the production of polycarbonates 失效
    改进的用于生产聚碳酸酯的酯交换方法

    公开(公告)号:US5444148A

    公开(公告)日:1995-08-22

    申请号:US155391

    申请日:1993-11-19

    IPC分类号: C08G64/20 C08G64/30 C08G64/00

    CPC分类号: C08G64/307 Y02P20/582

    摘要: An improvement to the transesterification process for the production of aromatic polycarbonates is disclosed. Into the melt which contains diphenols, carbonic acid diaryl esters and optionally branching agents and at temperatures of 130.degree. C. to 400.degree. C. and in the presence of catalysts there is mixed or passing thereover inert gas in a quantity of at least 0.5 Nm3 per kg of polycarbonate melt.

    摘要翻译: 公开了用于生产芳族聚碳酸酯的酯交换方法的改进。 在含有二酚,碳酸二芳基酯和任选的支化剂的熔体中,在130℃至400℃的温度下,在催化剂存在下,混合或通过至少为0.5Nm 3的量的惰性气体 每公斤聚碳酸酯熔体。

    Process for the preparation of thermoplastic polycarbonates
    7.
    发明授权
    Process for the preparation of thermoplastic polycarbonates 失效
    制备热塑性聚碳酸酯的方法

    公开(公告)号:US5340905A

    公开(公告)日:1994-08-23

    申请号:US191227

    申请日:1994-02-03

    CPC分类号: C08G64/307 C08G64/14

    摘要: A two step solvent-free process for the preparation of polycarbonates having a low degree of branching is disclosed. Accordingly, the process comprise(i) transesterifying in the melt, at temperatures of from 80.degree. to 250.degree. C. and under atmospheric pressure and for a time of up to five hours of diphenols and carbonic acid diaryl esters in the presence of a catalyst to form an oligocarbonate having a weight average molecular weight of from 8,000 to 18,000 and an OH-end group content of from 25 to 50%, and(ii) polycondensing of said oligocarbonate at temperatures of from 250.degree. C. to 295.degree. C. and pressures of from

    摘要翻译: 公开了一种用于制备具有低支化度的聚碳酸酯的两步无溶剂方法。 因此,该方法包括(i)在80℃至250℃的温度和大气压下在熔体中酯交换反应,并在催化剂存在下进行多达5小时的二酚和碳酸二芳基酯的酯交换反应 以形成重均分子量为8,000至18,000,OH-端基含量为25至50%的低聚碳酸酯,和(ii)所述低碳酸酯在250℃至295℃的温度下的缩聚反应。 和压力为<500毫巴至0.01毫巴,所述催化剂以每工具二酚的10-1至10-8工具的催化剂量存在,所述催化剂为选自以下的至少一种: 季铵化合物和季鏻化合物。

    Process for the production of polycarbonate
    10.
    发明申请
    Process for the production of polycarbonate 有权
    聚碳酸酯生产工艺

    公开(公告)号:US20050239996A1

    公开(公告)日:2005-10-27

    申请号:US11105680

    申请日:2005-04-14

    CPC分类号: C08G64/403 C08G64/205

    摘要: A process for the isolation of polycarbonate produced by the interfacial polymerization process is disclosed. Accordingly, the process entails (a) evaporating the organic solvent from the solution that contains solvent and polycarbonate to obtain a material system that contains 90 to 99.95% polycarbonate, the percent being relative to the weight of the system, and (b) passing the material system through inlet openings of a separating vessel to obtain a plurality of streams of polycarbonate, on entry into the inlet openings said material system being supersaturated with volatile constituents to an extent of at least 1 bar and having a temperature of 250° to 340° C. and a flow rate of 0.1 to 20 kg/hour, and (c) degassing the streams in the separating vessel wherein the pressure is 0.1 to 20 mbar to effect degassing of the polycarbonate.

    摘要翻译: 公开了通过界面聚合方法分离聚碳酸酯的方法。 因此,该方法需要(a)从含有溶剂和聚碳酸酯的溶液中蒸发有机溶剂以获得含有90至99.95%聚碳酸酯的材料体系,其百分数相对于体系重量,和(b)使 材料系统通过分离容器的入口开口,以获得多个聚碳酸酯流,在进入入口时,所述材料体系用挥发性成分过饱和至少1巴,温度为250°至340° 并且流速为0.1至20kg /小时,和(c)使分离容器中的气流脱气,其中压力为0.1至20毫巴,以实现聚碳酸酯脱气。