Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1978-06-07
1980-02-19
Higel, Floyd D.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
106288Q, 106308R, 106308Q, 106309, C07D47106, C09B 900, C09C 306
Patent
active
041895827
ABSTRACT:
A process for the manufacture of a red pigment from perylene-3,4,9,10-tetracarboxylic acid N,N'-bis-methylimide which has been obtained by methylating the corresponding diimide or by fusing naphthalic acid N-methylimide with an alkali metal hydroxide which comprises vatting a suspension of N,N'-bis-methylimide dye with 0.5-1.5 times by weight of an alkali metal dithionite in the presence of up to 4 times by weight of an alkali metal hydroxide relative to the quantity of the dithionite, at a temperature of from room temperature to 100.degree. C., to obtain the corresponding leuco compound, cooling the resulting solution to 20.degree.-40.degree. C., isolating and washing the leuco compound with fresh vatting solution until the solution is virtually colorless and clean and then oxidizing the leuco compound.
REFERENCES:
patent: 1913052 (1933-06-01), Jaeger et al.
patent: 2893994 (1959-07-01), Helfaer et al.
patent: 3331847 (1967-07-01), Gerson et al.
patent: 3628976 (1971-12-01), Stocker
Hiller Heinrich
Hoch Helmut
BASF - Aktiengesellschaft
Higel Floyd D.
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