Process for the manufacture of a perylene-3,4,9,10-tetracarboxyl

Details Process for the manufacture of a perylene-3,4,9,10-tetracarboxyl Process for the manufacture of a perylene-3,4,9,10-tetracarboxyl

1979-05-10

1981-02-10

Marquis, Melvyn I.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 37P, 260 4246, 260 4249, 546 37, C08K 500

Patent

active

042500796

ABSTRACT:
A process for the manufacture of perylenetetracarboxylic dianhydride pigments having improved dispersibility, which comprises adding at least one primary aliphatic or cycloaliphatic amine containing at least 12 carbon atoms to an aqueous alkaline solution of an alkali metal salt or ammonium salt of perylenetetracarboxylic acid, acidifying the reaction mixture, whereupon the free perylenetetracarboxylic acid precipitates and is then converted by heating the reaction mixture into the dianhydride, which is isolated in the conventional manner.

REFERENCES:
patent: 2543747 (1951-03-01), Shrader
patent: 3112289 (1963-11-01), Stocker
patent: 3357983 (1967-12-01), Weener et al.
patent: 3554776 (1971-01-01), Gerson et al.
patent: 3628976 (1971-12-01), Stocker
patent: 3775434 (1973-11-01), Spietschka et al.
patent: 3872103 (1975-03-01), Fabian
Chemical Abstracts, vol. 59, #11764c.

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