Process for the preparation of N,N'-dimethylperylene-3,4,9,10-te

Details Process for the preparation of N,N'-dimethylperylene-3,4,9,10-te Process for the preparation of N,N'-dimethylperylene-3,4,9,10-te

1989-11-08

1992-05-05

Shah, Mukund J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

108498, 524 90, C07D47106, C09B 6720

Patent

active

051109310

ABSTRACT:
Prepration of N,N'-dimethylperylene-3,4,9,10-tetracarboxylic diimide (DMP) ##STR1## in high-hiding pigment form by reacting perylene-3,4,9,10-tetracarboxylic dianhydride with methylamine. The reaction is carried out at 40.degree. to 200.degree. C. and the excess methylamine is distilled off only after the perylene-3,4,9,10-tetracarboxylic dianhydride used has been fully converted to the methylammonium salts of the corresponding N,N'-dimethyldicarbamoylperylenedicarboxylic acids. The temperature is held at 140.degree. to 200.degree. C. after, or after and during the formation of the DMP. The resultant highly crystalline crude pigment in aqueous suspension which has a mean particle size D.sub.50% (mass distribution) of 0.15 to 0.4 .mu.m and a mean length-to-width ratio q950% (mass distribution of the pigment particles of 10:1 to 3:1, is grounded in aqueous suspension until the mean particle size is 0.1 to 0.2 .mu.m and the mean length-to-width ratio of the pigment particles is less than 5:1. The resultant pre-pigment is heat-treated, in aqueous suspension or, after the addition of an organic solvent, in an aqueous-organic medium, until the pigment has a mean particle size of 0.125 to 0.4 .mu.m and a mean length-to-width ratio of the pigment particles of 4:1 or less. This pigment is particularly useful in pigmenting high-molecular weight resins such as resins used in automotive finishes.

REFERENCES:
patent: 4650879 (1987-03-01), Spietschka
patent: 4797162 (1989-01-01), Spietschka et al.
Marraccini et al., Chemical Abstracts, vol. 103, 1985, Abstract 72621w.

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