Flameproof linear polyester, a process for its preparation, and articles
formed from said polyester
    6.
    发明授权
    Flameproof linear polyester, a process for its preparation, and articles formed from said polyester 失效
    防火线性聚酯,其制备方法和由所述聚酯形成的制品

    公开(公告)号:US4517355A

    公开(公告)日:1985-05-14

    申请号:US486902

    申请日:1983-04-20

    CPC分类号: C08G63/6926

    摘要: A flameproof linear polyester is described containing, copolymerized in the molecule, a phosphorus compound of formula: ##STR1## where R is a hydrogen atom, an alkyl group with 1 to 4 carbon atoms or a hydroxyalkyl group, and R' is a hydrogen atom, a hydroxyalkyl group or the group --(CH.sub.2 CH.sub.2 O).sub.n H, where n varies from 1 to 4. Said linear polyester is prepared by firstly forming a low molecular weight precondensate from a dicarboxylic aromatic acid (or a relative lower alkyl diester) and an alkylene glycol, and then polycondensing in the presence of said phosphorus compound, in such a quantity as to obtain a content of phosphorus (expressed as the metal) in the linear polyester of between 0.4 and 0.8% by weight. The linear polyester thus obtained can be formed into articles such as fibres, film, sheets and other articles which, besides being flameproof, possess improved dyeing characteristics. A process is also described for preparing the phosphorus compounds corresponding to the aforesaid general formula, where R is hydrogen or an alkyl group containing 1 to 4 carbon atoms, and R' is hydrogen. Said phosphorus compounds are prepared by reacting phenylphosphinic acid or ester with paraformaldehyde, at a temperature of between 60.degree. and 150.degree. C.

    摘要翻译: 描述了一种防火线性聚酯,其在分子中共聚有下式的磷化合物:其中R是氢原子,具有1至4个碳原子的烷基或羟烷基,R'是氢原子 ,羟基烷基或基团 - (CH 2 CH 2 O)n H,其中n为1至4.所述线性聚酯通过首先由二羧酸芳族酸(或相对低级烷基二酯)形成低分子量预缩合物和亚烷基 乙二醇,然后在所述磷化合物的存在下进行缩聚,其量使得线性聚酯中的磷含量(以金属表示)为0.4-0.8重量%。 由此获得的线性聚酯可以形成为纤维,薄膜,片材等制品,除了具有隔爆性之外,还具有改善的染色特性。 还描述了制备对应于上述通式的磷化合物的方法,其中R是氢或含有1至4个碳原子的烷基,R'是氢。 所述磷化合物通过使苯基次膦酸或酯与多聚甲醛在60-150℃的温度下反应来制备。