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    • 7. 发明授权
    • Process for the in situ production of urea group-containing isocyanates
in polyols
    • 在多元醇中原位生产含脲基的异氰酸酯的方法
    • US4605756A
    • 1986-08-12
    • US682623
    • 1984-12-17
    • Gerhard GroglerRichard KoppHeinrich Hess
    • Gerhard GroglerRichard KoppHeinrich Hess
    • C08G18/00C08G18/30C08G18/32C08G18/65C08G18/78C08G18/80C07C119/048
    • C08G18/7825C08G18/8045
    • The invention relates to a process for the in situ production of dispersions or solutions of urea group-containing aromatic isocyanates by the low temperature reaction of aromatic diisocyanates and/or polyisocyanates (the NCO groups of which preferably exhibit different reactivities) with from 0.15 to 0.4 mols of water per NCO equivalent in relatively high molecular weight polyols and in the presence of catalysts accelerating the NCO/water reaction. Such catalysts are preferably selected from peralkylaminoalkyl ethers, peralkylamino-polyalkylene ethers and/or peralkyl-polyalkylene-polyamines. The present invention also relates to the resulting metastable solutions or dispersions and to the use thereof, optionally with the further addition of relatively high and low molecular weight compounds having hydroxyl, amino or hydrazide groups and with the optional addition of other polyisocyanates in polyurethane-forming ratios for the production of polyurethanes.
    • 本发明涉及通过芳族二异氰酸酯和/或多异氰酸酯(其优选表现出不同的反应性的NCO基团)的低温反应原位制备含脲基的芳族异氰酸酯的分散体或溶液的方法,其中0.15至0.4 在相对高分子量的多元醇中和在加速NCO /水反应的催化剂存在下,每NCO当量的水摩尔数。 这样的催化剂优选选自全烷基氨基烷基醚,全烷基氨基 - 聚亚烷基醚和/或全烷基 - 聚亚烷基 - 多胺。 本发明还涉及得到的亚稳溶液或分散体及其用途,任选地还可加入具有羟基,氨基或酰肼基团的相对高分子量和低分子量的化合物,并且任选地在聚氨酯形成中加入其它多异氰酸酯 生产聚氨酯的比例。