Process for purifying organic isocyanates, the organic isocyanates so purified and their use
    3.
    发明授权
    Process for purifying organic isocyanates, the organic isocyanates so purified and their use 有权
    纯化有机异氰酸酯的方法,有机异氰酸酯如此纯化及其用途

    公开(公告)号:US06395925B1

    公开(公告)日:2002-05-28

    申请号:US09569480

    申请日:2000-05-11

    IPC分类号: C07C25100

    摘要: The invention provides a new process for purifying organic isocyanates or isocyanate mixtures by mixing the isocyanates or isocyanate mixtures to be purified with at least one alcohol and/or thiol or a mixture of alcohols and/or thiols, heating the resultant mixture and simultaneously or subsequently degassing the mixture and/or working up the mixture by distillation and/or extraction.

    摘要翻译: 本发明提供了一种通过将待纯化的异氰酸酯或异氰酸酯混合物与至少一种醇和/或硫醇或醇和/或硫醇的混合物混合来纯化有机异氰酸酯或异氰酸酯混合物的新方法,加热所得混合物并同时或随后 通过蒸馏和/或萃取将混合物脱气和/或混合。

    Process for the preparation of polyisocyanates with a biuret structure
    9.
    发明授权
    Process for the preparation of polyisocyanates with a biuret structure 有权
    制备具有缩二脲结构的多异氰酸酯的方法

    公开(公告)号:US06720400B2

    公开(公告)日:2004-04-13

    申请号:US09858057

    申请日:2001-05-15

    IPC分类号: C08G1860

    CPC分类号: C08G18/7831 C07C273/1818

    摘要: The present invention relates to an improved process for the continuous preparation of polyisocyanates with a biuret structure comprising the steps of continuously reacting excess amounts of organic diisocyanates having exclusively aliphatically and/or cycloaliphatically bound isocyanate groups with organic diamines having exclusively aliphatically and/or cycloaliphatically bound primary amino groups at temperatures above 170° C. and adding acid before or during the reaction.

    摘要翻译: 本发明涉及连续制备具有缩二脲结构的多异氰酸酯的改进方法,其包括以下步骤:将仅含有脂族和/或环状结合的异氰酸酯基的过量的有机二异氰酸酯与仅具有脂族和/或环状结合的有机二胺连续反应 在高于170℃的温度下加入伯氨基并在反应之前或期间加入酸。