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US 4,067,881 AGranted
Manufacture of polychloro-copper phthalocyanines
AssigneeBASF SE
InventorsHermann Geeren, Wolfgang Fabian
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AssigneeBASF SE
InventorsHermann Geeren, Wolfgang Fabian
Estimating the term…
In a process for the manufacture of polychloro-copper phthalocyanines by chlorinating copper phthalocyanines in aluminum chloride/sodium chloride melts at from 110.degree. to 190.degree. C, the improvement wherein from 0.20 to 0.33 part by weight of copper phthalocyanines, per part by weight of melt, is rapidly introduced into the melt at temperatures from the solidification point of the melt to 120.degree. C, and after this material has been introduced, the chlorination, to give polychloro-copper phthalocyanine, is carried out at from 140.degree. to 160.degree. C by rapidly passing chlorine into the mixture. A polychloro-copper phthalocyanine which contains less than 0.05 per cent by weight of aluminum and which can be converted, by any conventional finishing process, into yellowish green pigment forms, is obtained with high space-time yield.
In a process for the manufacture of polychloro-phthalocyanines by chlorinating copper phthalocyanine in an aluminum chloride/sodium chloride melt at from 110.degree. to 190.degree. C, the improvement which comprises rapidly introducing at a rate of not less than about 500 to 720 kg/hour from 0.20 to 0.33 part by weight of copper phthalocyanine, per part by weight of melt, into the melt at temperatures from the solidification point of the melt to 120.degree. C, and after this copper phthalocyanine has been introduced, carrying out the chlorination to give polychloro-copper phthalocyanine at from 120.degree. to 160.degree. C whilst passing in, per hour, from 7 to 12% of the total amount of chlorine gas required.
Dependencies are inferred from the claim text.