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    11.
    发明专利
    未知

    公开(公告)号：DK141054B

    公开(公告)日：1979-12-31

    申请号：DK196075

    申请日：1975-05-05

    Applicant: HOECHST AG

    Inventor： SCHIESSLER S ,  SPIETSCHKA E ,  ELINKMANN H G

    IPC: C09B67/12 ,  C09B67/00 ,  C09B47/04

    Abstract: Highly pure alpha -copper phthalocyanine is obtained when a product regenerated from alpha -copper phthalocyanine sulfate by hydrolysis with water is aftertreated in an aqueous medium containing a polar organic non-aromatic compound which is water-soluble or liquid. The aftertreated product has an especially high tinctorial strength, is very easily dispersible and has a very pure reddish-blue shade.

    13.
    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.

    15.
    发明专利
    未知

    公开(公告)号：DK145501B

    公开(公告)日：1982-11-29

    申请号：DK699573

    申请日：1973-12-21

    Applicant: HOECHST AG

    Inventor： SPIETSCHKA E ,  SCHIESSLER S ,  TRONICH W

    IPC: C09B67/20 ,  C09B67/14 ,  C09B67/16

    Abstract: A process for the preparation of highly pure organic pigments which comprises converting organic dyestuffs having various degrees of purity into dyestuff salts capable of being isolated by means of suitable acids which dissolve the impurities contained in the dyestuff, separating them from the acid, recovering the dyestuffs in pure form from the dyestuff salts by the action of water and subjecting the isolated dyestuff in aqueous organic or aqueous-organic medium to a mechanical fine dispersion. By this process the dyestuff formed by the decomposition of the dyestuff sulfate is obtained in highly pure form and can extremely well be brought into a finely dispersed form so that it can be brought into pigment form already by short-time grinding. During the preparation and isolation of the dyestuff sulfate the sulfuric acid is obtained in such a high concentration that it can be regenerated in an economical manner and any ecological charge is avoided.

    16.
    发明专利
    未知

    公开(公告)号：DK138233C

    公开(公告)日：1979-01-15

    申请号：DK694973

    申请日：1973-12-20

    Applicant: HOECHST AG

    Inventor： SPIETSCHKA E ,  SCHIESSLER S ,  TRONICH W

    IPC: C09B67/16 ,  C09B67/50 ,  C09B67/54 ,  C09B67/00

    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.

    17.
    发明专利
    未知

    公开(公告)号：DK138233B

    公开(公告)日：1978-07-31

    申请号：DK694973

    申请日：1973-12-20

    Applicant: HOECHST AG

    Inventor： SPIETSCHKA E ,  SCHIESSLER S ,  TRONICH W

    IPC: C09B67/16 ,  C09B67/50 ,  C09B67/54 ,  C09B67/00 ,  C09B47/08

    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.

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