21.
    发明专利
    未知

    公开(公告)号:BR9912045A

    公开(公告)日:2001-04-03

    申请号:BR9912045

    申请日:1999-07-02

    Applicant: BASF AG

    Abstract: Concentrated leuco indigo solutions useful for dyeing cellulosic textile material consist essentially of from 25 to 55% by weight of leuco indigo in the form of the leuco indigo salt, an amount which is essentially stoichiometrically sufficient to convert the leuco indigo into the neutral leuco indigo salt of a mixture of at least two alkali metal hydroxides wherein none of the alkali metal hydroxides accounts for more than 70 mol %, and water.

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