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    Polyisocyanates of the diphenyl methane series
    15.
    发明授权
    Polyisocyanates of the diphenyl methane series 失效
    二苯甲烷系列的多异氰酸酯

    公开(公告)号：US4613687A

    公开(公告)日：1986-09-23

    申请号：US293748

    申请日：1981-08-17

    申请人： Hartmut Knofel ,  Michael Brockelt

    发明人： Hartmut Knofel ,  Michael Brockelt

    IPC分类号： C08G18/00 ,  C07C67/00 ,  C07C205/06 ,  C07C209/00 ,  C07C209/36 ,  C07C211/51 ,  C07C241/00 ,  C07C263/10 ,  C07C265/12 ,  C07C265/14 ,  C08G18/76 ,  C07C119/048

    CPC分类号： C07C265/12 ,  C07C205/06 ,  C07C209/36 ,  C08G18/7664

    摘要： A polyisocyanate or mixture of polyisocyanates in which the main component(s) correspond to the formula: ##STR1## in which R.sub.1, R.sub.2, and R.sub.3 each represent hydrogen or a saturated alkyl group containing from 1 to 12 carbon atoms, provided that at least two of these radicals represent hydrogen; andm, n, o and p each represent 0 or 1, provided that when m, n, o and/or p represent 0, the free valency is taken up by a hydrogen atom and that the sum of m+n+o+p is greater than 1 on a statistical average.Such polyisocyanate or mixture of polyisocyanates may be produced by first reacting a 4-nitrobenzyl halide, a 3-nitrobenzyl halide, a benzyl halide, a benzyl alcohol or a nitrobenzyl chloride isomer mixture with nitrobenzene, an alkyl-substituted nitrobenzene, an alkyl benzene or benzene in the presence of a Friedel-Crafts or an acid catalyst. This reaction product is then nitrated, the nitro groups are converted to amino groups by reduction or hydrogenation and the amino compound(s) subsequently phosgenated to form the polyisocyanate(s). The purity of the product polyisocyanate may be improved by distilling off secondary products before and/or after the phosgenation.

    摘要翻译： 多异氰酸酯或多异氰酸酯的混合物，其中主要成分对应于下式：其中R 1，R 2和R 3各自表示氢或含有1至12个碳原子的饱和烷基，条件是至少 这些基团中的两个表示氢; 并且m，n，o和p各自表示0或1，条件是当m，n，o和/或p表示0时，游离的价态被氢原子吸收，并且m + n + o + 统计平均数p大于1。 这种多异氰酸酯或多异氰酸酯的混合物可以通过首先使4-硝基苄基卤，3-硝基苄基卤，苄基卤，苯甲醇或硝基苄基氯异构体混合物与硝基苯，烷基取代的硝基苯，烷基苯或 苯在Friedel-Crafts或酸催化剂存在下。 然后将该反应产物硝化，通过还原或氢化将硝基转化为氨基，随后将氨基化合物气化以形成多异氰酸酯。 产物多异氰酸酯的纯度可以通过在光气化之前和/或之后蒸馏二次产物来改善。

    Diisocyanates of the diphenyl methane series and processes for the production thereof
    17.
    发明授权
    Diisocyanates of the diphenyl methane series and processes for the production thereof 失效
    二苯甲烷系二异氰酸酯及其制备方法

    公开(公告)号：US4587058A

    公开(公告)日：1986-05-06

    申请号：US290983

    申请日：1981-08-07

    申请人： Hartmut Knofel ,  Michael Brockelt

    发明人： Hartmut Knofel ,  Michael Brockelt

    IPC分类号： C08G18/00 ,  C07C67/00 ,  C07C205/06 ,  C07C241/00 ,  C07C263/10 ,  C07C265/12 ,  C07C265/14 ,  C08G18/76 ,  C07C118/02 ,  C07C119/048

    CPC分类号： C07C265/12 ,  C07C205/06 ,  C08G18/7671

    摘要： A diisocyanate corresponding to the general formula: ##STR1## in which R.sub.1, R.sub.2 and R.sub.3 represent hydrogen or a C.sub.2 -C.sub.12 alkyl group provided that two of the radicals R.sub.1, R.sub.2 and R.sub.3 represent hydrogen and the third represents an alkyl group containing from 2 to 12 carbon atoms. Mixtures of diisocyanates in which the described diisocyanate is a major substituent are also within the scope of this disclosure. Such compounds and mixtures are made by reacting a nitrobenzyl halide, an unsubstituted benzyl halide or a benzyl alcohol in the presence of a Friedel-Crafts catalyst with an alkylbenzene or a nitroalkylbenzene and then converting the nitro groups to amino groups by hydrogenation or reduction. The thus-produced amino compound is then phosgenated to form the diisocyanate.The compounds and mixtures of the present invention are useful in the production of polyurethane plastics.

    摘要翻译： 其中R 1，R 2和R 3表示氢或C 2 -C 12烷基的通式为：其中R1，R2和R3中的两个表示氢，第三个表示含有2个 至12个碳原子。 其中所述二异氰酸酯是主要取代基的二异氰酸酯的混合物也在本公开的范围内。 这样的化合物和混合物通过硝基苄基卤，未取代的苄基卤或苯甲醇在Friedel-Crafts催化剂存在下与烷基苯或硝基烷基苯反应，然后通过氢化或还原将硝基转化成氨基来制备。 然后将由此产生的氨基化合物光气化以形成二异氰酸酯。 本发明的化合物和混合物可用于生产聚氨酯塑料。