CH175681A - Process for making a pigment. - Google Patents

Process for making a pigment.

Info

Publication number
CH175681A
CH175681A CH175681DA CH175681A CH 175681 A CH175681 A CH 175681A CH 175681D A CH175681D A CH 175681DA CH 175681 A CH175681 A CH 175681A
Authority
CH
Switzerland
Prior art keywords
pigment
metal
phthalonitrile
making
sulfuric acid
Prior art date
Application number
Other languages
German (de)
Inventor
Limited Imperial Ch Industries
Original Assignee
Ici Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ici Ltd filed Critical Ici Ltd
Publication of CH175681A publication Critical patent/CH175681A/en

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  • Developing Agents For Electrophotography (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)

Description

  

  Verfahren zur Herstellung eines Pigmentes.    In dem Patent Nr. 172075 ist ein Ver  fahren zur Herstellung eines Pigmentes be  schrieben, welches auf dem Erhitzen von       Phthalonitril    mit Kupfer oder einem kupfer  abgebenden Mittel beruht.  



  Wir haben nun gefunden, dass man, aus  gehend von     Phthalonitril,    noch auf andere  Weise zu einem Pigmente gelangen kann.  Gemäss vorliegendem Verfahren geschieht  dies dadurch, dass man     Phthalonitril    mit einem       Alkalimetallalkoxyd    erhitzt und das Metall  aus der so erhaltenen Verbindung durch  Behandeln mit Schwefelsäure entfernt.    <I>Beispiel</I>    1,15 Teile Natrium werden in 32 Teilen  kochendem     Amylalkohol    aufgelöst und 6,4  Teile     Phthalonitril    zugesetzt. Es entsteht  sofort eine gelbe Farbe, welche rasch in  tiefgrün übergeht, und eine glänzende     Pur-          purtnasse    beginnt sich abzuscheiden.

   Das    Gemisch wird ca. eine halbe Stunde gekocht  und der     Amylalkohol        abdestilliert.    Der Rück  stand wird zwei- oder mehrmal mit kochen  dem Spiritus ausgezogen, um     Unreinigkeiten     aufzulösen. Aus dem Produkte wird dann  durch Auflösung in kalter, konzentrierter  Schwefelsäure, Eingiessen in Wasser und       Abfiltern    das Metall entfernt. Das so erhal  tene, metallfreie und keine     Alkyl-    oder       Alkoxy-Gruppe    enthaltende Pigment ist mit  dem in der britischen Patentschrift Nr. 389842  beschriebenen identisch.



  Process for making a pigment. In the patent no. 172075 a process for the production of a pigment is be written, which is based on the heating of phthalonitrile with copper or a copper-releasing agent.



  We have now found that, starting from phthalonitrile, there are other ways to get pigments. According to the present process, this is done by heating phthalonitrile with an alkali metal alkoxide and removing the metal from the compound thus obtained by treatment with sulfuric acid. <I> Example </I> 1.15 parts of sodium are dissolved in 32 parts of boiling amyl alcohol and 6.4 parts of phthalonitrile are added. A yellow color develops immediately, which quickly turns into deep green, and a shiny purple wetness begins to separate out.

   The mixture is boiled for about half an hour and the amyl alcohol is distilled off. The residue is extracted two or more times with boiling alcohol to dissolve impurities. The metal is then removed from the product by dissolving it in cold, concentrated sulfuric acid, pouring it into water and filtering it off. The pigment thus obtained, free of metal and containing no alkyl or alkoxy group, is identical to that described in British Patent No. 389842.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Pigmen tes, dadurch gekennzeichnet, dass man Phthalo- nitril mit einem Alkalimetallalkoxyd erhitzt und das Metall aus der resultierenden Ver bindung durch Behandlung mit Schwefelsäure entfernt. Das so erhaltene, metallfreie und weder Alkyl- noch Alkoxygruppen enthal tende Pigment ist mit dem in der britischen Patentschrift Nr. 389842 beschriebenen identisch. PATENT CLAIM: Process for the production of a pigment, characterized in that phthalonitrile is heated with an alkali metal alkoxide and the metal is removed from the resulting compound by treatment with sulfuric acid. The pigment thus obtained, free of metal and containing neither alkyl nor alkoxy groups, is identical to that described in British Patent No. 389842. UNTERANSPRUCH: Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass man Phthalonitril mit einer Lösüng von Natrium in Amylalkohol erhitzt und das Metall aus der resultierenden Verbindung durch Behandlung mit Schwefel säure entfernt. SUBCLAIM: Process according to claim, characterized in that phthalonitrile is heated with a solution of sodium in amyl alcohol and the metal is removed from the resulting compound by treatment with sulfuric acid.
CH175681D 1932-11-16 1933-11-16 Process for making a pigment. CH175681A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB175681X 1932-11-16

Publications (1)

Publication Number Publication Date
CH175681A true CH175681A (en) 1935-03-15

Family

ID=10097451

Family Applications (1)

Application Number Title Priority Date Filing Date
CH175681D CH175681A (en) 1932-11-16 1933-11-16 Process for making a pigment.

Country Status (1)

Country Link
CH (1) CH175681A (en)

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