Method for producing carbodiimides

    公开(公告)号:US11447447B2

    公开(公告)日:2022-09-20

    申请号:US16956179

    申请日:2018-12-17

    发明人: Wilhelm Laufer

    摘要: The present disclosure provides new methods for preparing carbodiimides including steps of carbodiimidizing monomeric aromatic isocyanates in the presence of a catalyst, separating low boilers and catalyst from the reaction product in a thin-film evaporator, and distilling the residue from the thin-film evaporation in a further thin-film evaporator.

    Methine dyes
    9.
    发明授权

    公开(公告)号:US11193023B2

    公开(公告)日:2021-12-07

    申请号:US16155177

    申请日:2018-10-09

    摘要: The present invention relates to novel methine dyes, methods for the preparation thereof and use thereof for dyeing plastics, especially polyamides, so as to obtain yellow to orange colourings with improved light fastness and improved thermal stability. Such dyes include a dye of the formula (I) in which
    R1 is hydrogen, halogen, COOH or COOR11, R2 is hydrogen, halogen, COOH, COOR12 or CN, R3 is alkyl or phenyl, R4 and R5 are each independently alkyl, R6, R7, R8, R9 and R19 are each independently hydrogen, halogen, alkyl, alkoxy or COOR13, and R11, R12 and R13 are each independently alkyl.