Aromatic polyphosphonates and a process for their production
    57.
    发明授权
    Aromatic polyphosphonates and a process for their production 失效
    芳香族聚膦酸酯及其生产工艺

    公开(公告)号:US4331614A

    公开(公告)日:1982-05-25

    申请号:US160646

    申请日:1980-06-18

    CPC分类号: C08G79/04

    摘要: Thermoplastic, branched aromatic polyphosphonates with average molecular weights (number average M.sub.n) of from 11,000 to more than 200,000, obtainable by transesterifying (a) from 97 to 100 moles of at least one diaryl phosphonate, and (b) from 0 to 3 moles of at least one triaryl phosphate--the sum of the moled of (a) and (b) being 100--with (c) from 90 to 99 moles of at least one aromatic dihydroxy compound, and (d) from 0 to 3 moles of at least one aromatic trihydroxy or tetrahydroxy compound--with the proviso that at least one of the components (b) and (d) is present in a quantity of at least 0.001 mole and that, where (b) and (d) are used, the maximum limit on the moles is 3.0.

    摘要翻译: 平均分子量(数均Mn)为11,000至大于200,000的热塑性支链芳族聚膦酸酯,可通过(a)97-100摩尔的至少一种二芳基膦酸酯和(b)0-3摩尔的 至少一种磷酸三芳基酯,(a)和(b)的衍生物的总和为100-(c)90-99摩尔的至少一种芳族二羟基化合物,和(d)0-3摩尔的 至少一种芳族三羟基或四羟基化合物 - 条件是组分(b)和(d)中的至少一种以至少0.001摩尔的量存在,并且使用(b)和(d)时, 摩尔数的最大限度为3.0。