Preparation of liquid formulations of basic azo dyes
    1.
    发明授权
    Preparation of liquid formulations of basic azo dyes 有权
    碱性偶氮染料液体配方的制备

    公开(公告)号:US06743901B1

    公开(公告)日:2004-06-01

    申请号:US10410397

    申请日:2003-04-10

    IPC分类号: C09B3304

    摘要: A process for preparing liquid formulations of dyes of the general formula I where the variables are as defined in the specification by diazotizing an amine of the formula II and then coupling the diazonium salt onto a compound of the formula III and also optionally adding solubilizing additives, which comprises effecting said diazotizing at a pH set to an acidic value using pure methanesulfonic acid or at least 20 mol % mixtures of methanesulfonic acid in monobasic acids.

    摘要翻译: 制备通式I的染料的液体制剂的方法,其中变量如本说明书中所定义,通过将式II的胺重氮化,然后将重氮盐偶联到式III的化合物上,还任选地加入增溶添加剂,其包括实现 在使用纯甲磺酸或甲磺酸在一元酸中的至少20摩尔%混合物的pH设定为酸值时进行重氮化。