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    4.
    发明专利
    未知

    公开(公告)号：DE4229207A1

    公开(公告)日：1994-03-03

    申请号：DE4229207

    申请日：1992-09-02

    Applicant: HOECHST AG

    Inventor： JUNG RUEDIGER DR ,  WEIDE JOACHIM ,  METZ HANS JOACHIM DR

    IPC: C09B33/153 ,  C09B41/00 ,  C09B56/12 ,  C09B67/20 ,  C09D11/037 ,  C09D11/02 ,  B41M1/00

    Abstract: An ecologically and economically advantageous process for preparing a disazo pigment of the formula (I) or a mixture of said disazo pigments (I) where D1 and D2 are identical or different and each is unsubstituted phenyl, phenyl with from 1 to 5 substituents, unsubstituted naphthyl, naphthyl with from 1 to 3 substituents, unsubstituted anthraquinonyl, anthraquinonyl with from 1 to 3 substituents, or a radical of a fused aromatic heterocycle which contains from 1 to 3 identical or different heteroatoms from nitrogen or oxygen and sulfur and is unsubstituted or has from 1 to 3 substituents, R1 and R2 are identical or different and each is hydrogen, halogen, C1-C4-alkyl, C1-C4-alkoxy, C1-C5-alkoxycarbonyl, nitro, cyano, phenoxy or trifluoromethyl, by azo coupling, comprises a) azo coupling in an aqueous medium and in the absence of an organic solvent in a single step and b) adding at the latest immediately prior to the isolation of the disazo pigment at least one nonionic surfactant which has a cloud point in aqueous solution.

    PROCESS FOR PREPARING HIGHLY CONCENTRATED AQUEOUS PRESS CAKES OF AZO DISPERSE DYES
    5.
    发明专利
    PROCESS FOR PREPARING HIGHLY CONCENTRATED AQUEOUS PRESS CAKES OF AZO DISPERSE DYES 未知

    公开(公告)号：IN164836B

    公开(公告)日：1989-06-10

    申请号：IN766CA1985

    申请日：1985-10-30

    Applicant: HOECHST AG

    Inventor： WEIDE JOACHIM ,  DIETZ ERWIN ,  DEUBEL REINHOLD

    IPC: C09B67/20 ,  B01D37/02 ,  B01D37/03 ,  C09B41/00 ,  C09B67/54 ,  C09K23/42 ,  C09B67/00

    Abstract: According to the invention, addition of one or more surfactants having a cloud point in aqueous solution to an aqueous suspension of an azo disperse dye gives after the isolation of the dye at a temperature above the cloud point aqueous press cakes containing a large amount of this dye. The direct processing of press cakes as obtained for example after the synthesis and isolation of azo disperse dyes to practical dispersions for use requires a minimum dye content in the press cakes. The minimum content is frequently not obtained when conventional methods of isolation are used, so that it is necessary to proceed via the indirect route of drying to obtain powders and redispersing the powders. By using the process according to the invention it is possible to cut out the costly indirect route or, if desired, to reduce the expense of drying to obtain powders by an appreciable margin.

    10.
    发明专利
    未知

    公开(公告)号：MX162763A

    公开(公告)日：1991-06-26

    申请号：MX50285

    申请日：1985-11-05

    Applicant: HOECHST AG

    Inventor： WEIDE JOACHIM ,  DIETZ ERWIN ,  DEUBEL REINHOLD

    IPC: C09B67/38 ,  B01D37/02 ,  B01D37/03 ,  B01J13/00 ,  C09B67/02 ,  C09B67/42 ,  C09B67/54

    Abstract: According to the invention, addition of one or more surfactants having a cloud point in aqueous solution to an aqueous suspension of a solid gives after the isolation of the solid at a temperature above the cloud point aqueous press cakes containing a large amount of this solid. The direct processing of press cakes as obtained for example after the synthesis and isolation of dyes or pigments to give practical aqueous pastes or dispersions requires a minimum solids content in the press cakes. The minimum content is frequently not obtained when conventional methods of isolation are used, so that it is necessary to proceed via the indirect route of drying to obtain the powders and redispersing the powders. By using the process according to the invention it is possible to cut out the costly indirect route or, if desired, to reduce the expense of drying to obtain powders by an appreciable margin.

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