VERFAHREN ZUR HERSTELLUNG VON POLYISOCYANATEN
    49.
    发明公开
    VERFAHREN ZUR HERSTELLUNG VON POLYISOCYANATEN 审中-公开
    用于生产多异氰酸酯

    公开(公告)号:EP2714649A2

    公开(公告)日:2014-04-09

    申请号:EP12726063.6

    申请日:2012-05-29

    Applicant: BASF SE

    CPC classification number: C07C273/1863 C07C263/06 C07C275/14 C07C265/14

    Abstract: The invention provides a multistage process for continuously preparing organic polyisocyanates, preferably diisocyanates, more preferably aliphatic or cycloaliphatic diisocyanates, by reacting the corresponding organic polyamines with carbonic acid derivatives and alcohols to give low molecular weight monomeric polyurethanes and cleaving the latter. The invention further provides a corresponding preparation process in which the polyisocyanates prepared and unutilizable residues are removed at particular reaction stages, and reusable by-products and intermediates are recycled into preceding stages.

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