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    Process for preparing di(aminophenyl)-methanes
    11.
    发明授权
    Process for preparing di(aminophenyl)-methanes 失效
    制备DI（氨基苯基） - 金属的方法

    公开(公告)号：US3676497A

    公开(公告)日：1972-07-11

    申请号：US3676497D

    申请日：1968-08-06

    Applicant: UPJOHN CO

    Inventor： RECCHIA FRANK P ,  ULRICH HENRI

    IPC: C07C263/10 ,  C07C85/08

    CPC classification number: C07C209/78 ,  C07C211/50 ,  C07C263/10 ,  C08G73/02 ,  C07C265/14

    Abstract: Di(aminophenyl)methane having a high proportion of the o,p''isomer (10 to 60 percent) and a substantial proportion of the o, o''-isomer (5 to 25 percent) is obtained by reacting at least 3.5 moles of aniline with 1 mole of formaldehyde, separating the water of condensation from the resulting mixture of aniline and anilino-acetal, heating the anhydrous mixture to 125* C. to 205* C. and adding a proton source (aniline hydrochloride preferred). The mixture of di(aminophenyl)-methane isomers can be separated from the mixture of polyamines so obtained and phosgenated to give a mixture of the corresponding isomeric di(isocyanatophenyl)methanes which mixture is a storage stable liquid. Alternatively the mixture of polyamines can be phosgenated, without separation of the di(aminophenyl)-methane, to give the corresponding mixture of polymethylene polyphenyl polyisocyanates. The latter mixture gives polyurethane foams of much lighter color than those obtained using comparable mixtures produced by prior art procedures.

    Abstract translation: 具有高比例的o，p'-异构体（10〜60％）和相当比例的o，o'-异构体（5〜25％）的二（氨基苯基）甲烷是通过使至少3.5摩尔 苯胺与1摩尔甲醛，从所得苯胺和苯胺基缩醛混合物中分离出缩合的水，将无水混合物加热至125℃至205℃，并加入质子源（优选苯胺盐酸盐）。 二（氨基苯基） - 甲烷异构体的混合物可以从如此得到的多胺混合物中分离并进行光气化，得到相应的异构二（异氰酸基苯基）甲烷的混合物，该混合物是储存稳定的液体。 或者，多胺的混合物可以被光气化，而不分离二（氨基苯基） - 甲烷，得到聚亚甲基多苯基多异氰酸酯的相应混合物。 后者的混合物提供比使用现有技术方法制备的可比混合物得到的那些颜色要浅的聚氨酯泡沫。

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