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    Water-dispersable preparations of water-insoluble dyes
    42.
    发明专利
    Water-dispersable preparations of water-insoluble dyes 未知

    公开(公告)号：GB1043490A

    公开(公告)日：1966-09-21

    申请号：GB3686265

    申请日：1965-08-27

    Applicant: BASF AG

    Inventor： DAUBACH EWALD ,  PREUGSCHAS HELMUT ,  WAECHTER RUDOLF ,  BELDE HORST ,  VESCIA MICHELE ,  BEST MANFRED

    IPC: C09B67/00 ,  C09B67/42 ,  C09B67/46

    Abstract: A water-dispersible powder or paste preparation of a water-insoluble dye contains at least one sodium salt of a water-soluble condensation product of (I) a naphthalene monosulphonic acid or derivative thereof and formaldehyde or (II) a mononuclear aromatic compound capable of reacting with 2 moles of formaldehyde, a napthol sulphonic acid, formaldehyde and optionally sodium sulphite, the content of inorganic salt in said preparation being less than 5%, preferably 0.5% by weight of compound (I) or (II). Products (I) and (II) may be prepared free from salts from the start by a conventional method or the conventional industrial product may be freed from salts by dialysis, ion exchange, electrolysis or precipitation with organic liquids. The preparations may also contain urea or thiourea as dispersion assistants. Suitable dyes are vat or disperse dyes. The preparations may be prepared by grinding, kneading or spray drying. Suitable products (I) and (II) are specified and examples are given.

    Production of low-viscosity dye pastes
    43.
    发明专利
    Production of low-viscosity dye pastes 未知

    公开(公告)号：GB973851A

    公开(公告)日：1964-10-28

    申请号：GB3148663

    申请日：1963-08-09

    Applicant: BASF AG

    Inventor： DAUBACH EWALD ,  STOECKL ERICH

    IPC: C09B67/00 ,  C09B67/10

    Abstract: Pastes of water-insoluble dyestuffs having low viscosity are prepared by a process wherein the pressed product of the dye is heated to temperatures of 80-100 DEG C. whilst stirring at atmospheric pressure or to temperatures of 100-200 DEG C. whilst stirring at superatmospheric pressure, followed by a conventional milling process. A dispersing agent may be added to the pressed product before heating or after heating. The pressed product is a p water-containing cake of dyestuff obtained from the filter press after the dye manufacture or a purification process. Dyes referred to are vat and dispersed dyes and figments. Specification 496,652 is referred to.

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