Polyisocyanate mixtures, a process for their production and their use
for the production of polyurethanes
    26.
    发明授权
    Polyisocyanate mixtures, a process for their production and their use for the production of polyurethanes 失效
    多异氰酸酯混合物,其生产方法及其用于生产聚氨酯的方法

    公开(公告)号:US5464921A

    公开(公告)日:1995-11-07

    申请号:US156202

    申请日:1993-11-22

    摘要: The present invention relates to polyisocyanate mixtures which are solid below 40.degree. C. and liquid above 125.degree. C. and which havea) an average isocyanate functionality of at least 2.1,b) a content of free isocyanate groups bonded to tertiary (cyclo)aliphatic carbon atoms (calculated as NCO; molecular weight=42) of 5 to 22 wt. %,c) a urethane group content calculated as --NH--CO--O--; molecular weight=59) of 2 to 30 wt. %,d) an isocyanurate group content (calculated as C.sub.3 N.sub.3 O.sub.3 ; molecular weight=126) of 0 to 30 wt. % ande) a carboxylic acid ester group content (calculated as --CO--O--; molecular weight=44) of 0 to 25 wt. % and/orf) a carbonate group content (calculated as --O--CO--O--; molecular weight=60) of from 0 to 34 wt. %with the proviso that the total amount of ester groups e) and carbonate groups f) is at least 2 wt. %.The present invention also relates to a process for the production of these polyisocyanate mixtures and to their use for the production of polyurethanes, in particular as the crosslinking component in heat-curable two-component polyurethane powder coatings for coating heat-resistant substrates.

    摘要翻译: 本发明涉及固体低于40℃和高于125℃的液体的多异氰酸酯混合物,其具有a)平均异氰酸酯官能度至少为2.1,b)结合到叔(环)的游离异氰酸酯基团的含量, 脂肪族碳原子(以NCO计算;分子量= 42)为5〜22重量份。 %,c)以-NH-CO-O-计算的氨基甲酸酯基含量; 分子量= 59)为2〜30wt。 %,d)异氰脲酸酯基含量(以C3N3O3计算;分子量= 126)为0〜30wt。 %和e)羧酸酯基含量(以-CO-O-计算;分子量= 44)为0〜25重量%。 %和/或f)0至34重量%的碳酸酯基含量(以-O-CO-O-计算;分子量= 60) %,条件是酯基e)和碳酸酯基团f)的总量为至少2重量%。 %。 本发明还涉及生产这些多异氰酸酯混合物的方法及其用于生产聚氨酯的方法,特别是作为用于涂覆耐热基材的可热固化双组分聚氨酯粉末涂料中的交联组分。