High molecular weight polycarbonates of
.alpha.,.alpha.,.alpha.,.alpha.',.alpha.',.alpha.'-hexakisaryl-1,3-and/o
r -1,4-dimethyl benzenes
    41.
    发明授权
    High molecular weight polycarbonates of .alpha.,.alpha.,.alpha.,.alpha.',.alpha.',.alpha.'-hexakisaryl-1,3-and/o r -1,4-dimethyl benzenes 失效
    {60,{60,{60,{60 {40,{60 {40,{60 {40-己基芳基-1,3-和/或-1,4-二甲基苯

    公开(公告)号:US4009148A

    公开(公告)日:1977-02-22

    申请号:US579532

    申请日:1975-05-21

    摘要: The present invention is related to high molecular weight polycarbonates based on aromatic dihydroxy compounds which contain 5 to 100 mol % preferably 20 to 100 mol % of structural units derived from .alpha.,.alpha.,.alpha.,.alpha.',.alpha.',.alpha.'-hexakisaryl-1,3-and/or -1,4-dimethyl benzene dihydroxy compounds. In a preferred embodiment, the polycarbonate is a copolymer of the hexakisaryl dihydroxy compounds and bisphenols known to be useful in producing polycarbonates. The residues of the hexakisaryl compound may be 5 to 90 mol %, preferably 20 to 70 mol % of the structural units. An especially preferred copolymer is that between the hexakisaryl compounds and .alpha.,.alpha.'-(hydroxyphenyl)-diisopropyl benzenes. These polycarbonates show improved heat stability and higher second order transition temperature points than conventional polycarbonates and are useful in applications involving high service temperatures such as electrical insulating film.

    摘要翻译: 本发明涉及基于芳族二羟基化合物的高分子量聚碳酸酯,其含有5至100摩尔%,优选20至100摩尔%的衍生自α,α,α,α',α',α'-六氟甲磺酸的结构单元, 1,3-和/或-1,4-二甲基苯二羟基化合物。 在优选的实施方案中,聚碳酸酯是已知可用于制备聚碳酸酯的六芳基二羟基化合物和双酚的共聚物。 六芳基化合物的残基可以为结构单元的5〜90摩尔%,优选为20〜70摩尔%。 特别优选的共聚物是六芳基化合物和α,α'-(羟基苯基) - 二异丙基苯之间的共聚物。 这些聚碳酸酯显示比常规聚碳酸酯更好的热稳定性和更高的二阶转变温度点,并且可用于涉及高使用温度的应用,例如电绝缘膜。