Selective process for the preparation of diphenylmethane bis-(dialkyl
ureas
    2.
    发明授权
    Selective process for the preparation of diphenylmethane bis-(dialkyl ureas 失效
    二苯基甲烷双 - (二烷基脲)的制备方法

    公开(公告)号:US5220061A

    公开(公告)日:1993-06-15

    申请号:US963167

    申请日:1992-10-19

    CPC分类号: C07C273/1854

    摘要: A selective process for the preparation of diphenylmethane bis(dialkylureas) is disclosed. An alkyl phenylcarbamate or an N,N-dialkyl-N'-phenylurea is reacted with a methylene bis(alkyl carbamate) in the presence of an acid catalyst. The use of a staged addition of phenylcarbamate or phenylurea to the methylene bis(carbamate) and the use of a ramped temperature program are the keys to good selectivity to MDI dimer products.

    摘要翻译: 公开了制备二苯基甲烷双(二烷基脲)的选择性方法。 在酸催化剂存在下,将烷基苯基氨基甲酸酯或N,N-二烷基-N'-苯基脲与亚甲基双(烷基氨基甲酸酯)反应。 使用分段加成苯基氨基甲酸酯或苯脲至亚甲基双(氨基甲酸酯)和使用斜坡温度程序是对MDI二聚体产物具有良好选择性的关键。

    Process for the preparation of aromatic mono- and polyisocyanates
    3.
    发明授权
    Process for the preparation of aromatic mono- and polyisocyanates 失效
    制备芳族单和多异氰酸酯的方法

    公开(公告)号:US4871871A

    公开(公告)日:1989-10-03

    申请号:US266607

    申请日:1988-11-03

    IPC分类号: C07C263/06

    CPC分类号: C07C263/06

    摘要: An improved process is provided for the preparation of aromatic mono- and poly- isocyanates by the thermal decomposition of an aromatic bis dialkyl urea in solvent in the presence of a tertiary amine hydrohalide, such as pyridine hydrochloride, as a promoter for conversion of the urea groups to isocyanates.

    摘要翻译: 提供了一种通过在叔胺氢卤酸盐如吡啶盐酸盐存在下在溶剂中热分解芳族单 - 和多 - 异氰酸酯作为尿素转化促进剂的方法的改进方法 异氰酸酯基团。

    Cement composition
    4.
    发明授权
    Cement composition 失效
    水泥组成

    公开(公告)号:US5413634A

    公开(公告)日:1995-05-09

    申请号:US238566

    申请日:1994-05-05

    摘要: The invention relates to a cement composition containing a shrinkage reducing amount of an alkyl ether derivative of an aliphatic polyhydroxy compound of the formula:Q--[(A).sub.n --OR].sub.xwherein Q is a C.sub.3 -C.sub.12 aliphatic hydrocarbon group, R is hydrogen or C.sub.1 -C.sub.10 alkyl, at least one R being the C.sub.1 -C.sub.10 alkyl group, A is C.sub.2 -C.sub.4 oxyalkylene, n is 0-10, and x is 3-5.

    摘要翻译: 本发明涉及含有减缩量的下式的脂肪族多羟基化合物的烷基醚衍生物的水泥组合物:Q- [(A)n -OR] x其中Q是C 3 -C 12脂族烃基,R是 氢或C1-C10烷基,至少一个R为C1-C10烷基,A为C2-C4氧化烯,n为0-10,x为3-5。

    Process for the preparation of methylene diphenylene diisocyanates and
polymethylene polyphenylene poly (diisocyanates)
    8.
    发明授权
    Process for the preparation of methylene diphenylene diisocyanates and polymethylene polyphenylene poly (diisocyanates) 失效
    亚甲基二亚苯基二异氰酸酯和聚亚甲基聚亚苯基聚(二异氰酸酯)的制备方法

    公开(公告)号:US4873364A

    公开(公告)日:1989-10-10

    申请号:US283430

    申请日:1988-12-09

    IPC分类号: C07C263/06

    CPC分类号: C07C263/06

    摘要: An improved process is provided for the preparation of methylene diphenylene diisocyanates (MDI) and polymethylene polyphenylene poly (diisocyanates) by the thermal decomposition of a methylene diphenylene bis (dialkylurea) or a polymethylene polyphenylene poly (dialkylurea) in a solvent in the presence of a tertiary amine hydrohalide, such as pyridine hydrochloride, as a promoter for conversion of the urea groups to the corresponding isocyanate.

    摘要翻译: 提供了一种通过亚甲基二亚苯基双(二烷基脲)或多亚甲基聚亚苯基聚(二烷基脲)在溶剂中在存在下进行热分解制备亚甲基二亚苯基二异氰酸酯(MDI)和多亚甲基聚亚苯基聚(二异氰酸酯)的改进方法 叔胺氢卤化物,例如吡啶盐酸盐,作为将脲基团转化成相应的异氰酸酯的促进剂。

    Selective process for the preparation of diphenylmethane diisocyanate
precursors
    10.
    发明授权
    Selective process for the preparation of diphenylmethane diisocyanate precursors 失效
    制备二苯基甲烷二异氰酸酯前体的选择性方法

    公开(公告)号:US5206412A

    公开(公告)日:1993-04-27

    申请号:US832251

    申请日:1992-02-07

    CPC分类号: C07C269/06

    摘要: A selective process for the preparation of diphenylmethane diisocyanate precursors is disclosed. An alkyl phenylcarbamate or an N,N-dialkyl-N'-phenylurea is reacted with a methylene bis(alkyl carbamate) in the presence of an acid catalyst. The use of a staged addition of phenylcarbamate or phenylurea to the methylene bis(carbamate) and the use of a ramped temperature program are the keys to good selectivity to MDI dimer products.

    摘要翻译: 公开了制备二苯基甲烷二异氰酸酯前体的选择性方法。 在酸催化剂存在下,将烷基苯基氨基甲酸酯或N,N-二烷基-N'-苯基脲与亚甲基双(烷基氨基甲酸酯)反应。 使用分段加成苯基氨基甲酸酯或苯脲至亚甲基双(氨基甲酸酯)和使用斜坡温度程序是对MDI二聚体产物具有良好选择性的关键。