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    PROCESS FOR PREPARING COPPER PHTHALOCYANINE PIGMENTS OF THE ALFA-MODIFICATION
    52.
    发明专利
    PROCESS FOR PREPARING COPPER PHTHALOCYANINE PIGMENTS OF THE ALFA-MODIFICATION 未知

    公开(公告)号：IN140029B

    公开(公告)日：1976-09-04

    申请号：IN2791CA1973

    申请日：1973-12-22

    Applicant: HOECHST AG

    Inventor： SPIETSCHKA E ,  SCHIEBLER S ,  TRONICH W

    IPC: C09B67/16 ,  C09B67/50 ,  C09B67/54 ,  C09B47/04 ,  C09B47/08 ,  C09B47/10 ,  C09B62/00

    Abstract: A process for preparing very pure copper phthalocyanine pigments of the alpha -modification, wherein substituted or unsubstituted copper phthalocyanines having different degrees of purity are converted into copper phthalocyanine salts capable of being isolated, with the aid of suitable acids which dissolve the impurities contained in the dyestuff, wherein these salts are separated from the acid, the copper phthalocyanines of the alpha -modification are set free in a pure form from the copper phthalocyanine salts by the action of water and wherein the isolated copper phthalocyanine is subject in an aqueous suspension to a mechanical fine division. This process yields copper phthalocyanines of the alpha -modification in a very pure form without causing problems with respect to the waste water.

    54.
    发明专利
    未知

    公开(公告)号：BR7600681A

    公开(公告)日：1976-08-31

    申请号：BR7600681

    申请日：1976-02-03

    Applicant: HOECHST AG

    Inventor： SCHIESSLER S ,  SPIETSCHKA E ,  ZUNKER R

    IPC: C09B5/62 ,  C09B57/00 ,  C09B67/00

    Abstract: N,N'-dimethyl-perylene-3,4,9,10-tetracarboxylic acid diimide is obtained as a valuable pigment of a pure red shade, by reacting perylene-3,4,9,10-tetracarboxylic acid anhydride at low temperatures with a dilute aqueous solution of at least the four-fold molar amount of methylamine. The so-obtained bis-ammonium salt of the bis-N-methyl amide is then heated without isolation to effect ring closure while splitting off two mols of water and two mols of methyl amine. The product can be used without any finish operation or can be after-treated to yield a pigment of an exceptionally high transparency or of a good hiding power.

    56.
    发明专利
    未知

    公开(公告)号：BR7308853D0

    公开(公告)日：1974-08-22

    申请号：BR885373

    申请日：1973-11-12

    Applicant: HOECHST AG

    Inventor： DEUCKER W ,  SPIETSCHKA E ,  STEIDL D

    IPC: C09B47/067 ,  C09B67/00 ,  C09B47/04

    Abstract: A continuous process for preparing copper phthalocyanines by caking a mixture of phthalodinitrile, and a copper salt which comprises carrying out the reaction in a continuously working, heatable, tubular vibration mill, which contains iron or steel bars in the grinding room.

    58.
    发明专利
    未知

    公开(公告)号：BR7204497D0

    公开(公告)日：1973-09-25

    申请号：BR449772

    申请日：1972-07-07

    Applicant: HOECHST AG

    Inventor： SPIETSCHKA E ,  LANDLER J

    IPC: C09B5/24 ,  C09B57/14 ,  C09B5/00

    Abstract: 1393957 Preparing pigments HOECHST AG 7 July 1972 [10 July 1971] 31944/72 Heading C4P Pigments containing the benzothioxanthene nucleus are prepared by reacting a compound containing the 1-(2 1 -aminophenylmercapto)-naphthalene nucleus or the 1-phenylmercapto-8- aminonaphthalene nucleus in a tertiary amine with a compound yielding nitrosyl groups and heating the diazonium compound formed. Compounds yielding nitrosyl groups are nitrososulphuric acid and nitrosyl chloride and the tertiary amines used include pyridine, picoline, quinoline, isoquinoline or mixtures thereof. The starting compounds include 3-(2 1 -amino-phenylmercapto) - benzanthrone and 4 - (2 - aminophenylmercapto)-naphthalic acid anhydride.

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