Production and use of high molecular weight aliphatic polycarbonates
    1.
    发明授权
    Production and use of high molecular weight aliphatic polycarbonates 失效
    生产和使用高分子量脂肪族聚碳酸酯

    公开(公告)号:US06767986B2

    公开(公告)日:2004-07-27

    申请号:US10420150

    申请日:2003-04-22

    IPC分类号: C08G6400

    CPC分类号: C08G64/305

    摘要: A process for the production of high molecular weight aliphatic polycarbonates is disclosed. The process entails a first stage wherein a low molecular weight aliphatic polycarbonate is prepared and a second stage where the low molecular weight aliphatic polycarbonate is condensed with diaryl carbonate in a melt transesterification process to form a high molecular weight aliphatic polycarbonate. The resulting high molecular weight aliphatic polycarbonate is suitable for the production of extrudates, films and molded articles.

    摘要翻译: 公开了生产高分子量脂族聚碳酸酯的方法。 该方法需要制备第一阶段,其中制备低分子量脂族聚碳酸酯和第二阶段,其中低分子量脂族聚碳酸酯在熔融酯交换方法中与碳酸二芳酯缩合形成高分子量脂族聚碳酸酯。 所得到的高分子量脂族聚碳酸酯适用于生产挤出物,薄膜和模塑制品。

    Thermoplastic polycarbonate compositions having high toughness
    4.
    发明授权
    Thermoplastic polycarbonate compositions having high toughness 失效
    具有高韧性的热塑性聚碳酸酯组合物

    公开(公告)号:US06730748B2

    公开(公告)日:2004-05-04

    申请号:US10191583

    申请日:2002-07-09

    IPC分类号: C08L6900

    摘要: A thermoplastic molding composition that features improved low-temperature properties and is thus suitable for application in exterior automotive parts is disclosed. The composition contains (A) 80 to 60 percent of a copolycarbonate wherein 65 to 75 mole percent of its structural units are derived from compounds of formula (I) wherein R1, R2, R3 and R4 independently of one another represents H, C1-C4-alkyl, phenyl, substituted phenyl or halogen, and wherein 25 to 35 mole percent of its structural units are derived from compounds of formula (II) where R5, R6, R7 and R8 independently one of the others denote H, CH3, Cl or Br and X is C1-C5-alkylene, C2-C5-alkylidene, C5-C6-cycloalkylene, C5-C10-cycloalkylidene and (B) 20 to 40 percent of a homopolycarbonate of bisphenol A having a melt flow rate, determined in accordance with ASTM D-1238 under 1.2 kg loading at 300° C. of 3 to 12 gm/10 minutes.

    摘要翻译: 公开了一种具有改进的低温性能并因此适用于外部汽车部件的热塑性模塑组合物。 该组合物含有(A)80至60%的共聚碳酸酯,其中65至75摩尔%的结构单元衍生自式(I)化合物,其中R 1,R 2,R 3和R 3, 4>彼此独立地表示H,C 1 -C 4 - 烷基,苯基,取代的苯基或卤素,并且其中25至35摩尔%的结构单元衍生自式(II)的化合物,其中R 5, 其中R 6和R 8独立地表示H,CH 3,Cl或Br,X是C 1 -C 5亚烷基,C 2 -C 5亚烷基,C 5 -C 6亚环烷基,C 5 -C 10 - 亚环烷基和(B)具有熔体流动速率的双酚A的均聚碳酸酯的20-40%,其在1.2kg,300℃下加载3至12gm / 10分钟,根据ASTM D-1238确定。