Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1979-02-26
1981-01-27
Tovar, Jose
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
546 56, 546 57, 106288Q, C09B 4800
Patent
active
042476950
ABSTRACT:
A process for preparing beta or gamma crystals of linear quinacridone, substituted quinacridone or solid solutions thereof by contacting premilled quinacridone with 45-60% by weight sulfuric acid and 0-10% by weight of a surfactant based on the quinacridone at a weight ratio of acid to quinacridone of 3:1-6:1 to form a slurry, agitating said slurry for a period of time at 45.degree.-75.degree. C., adding water to form a dilute slurry, agitating said dilute slurry for a period of time at 75.degree.-95.degree. C. and separating quinacridone from the liquid of the dilute slurry.
REFERENCES:
patent: 3017414 (1962-01-01), Minnich et al.
patent: 3030370 (1962-04-01), Jackson
patent: 3051720 (1962-08-01), Minnich
patent: 3326918 (1967-06-01), West
patent: 3362957 (1968-01-01), West
patent: 3697464 (1972-10-01), Giambalvo et al.
patent: 4015998 (1977-04-01), Jaffe
patent: 4024148 (1977-05-01), Tyson et al.
patent: 4088506 (1978-05-01), Wetzel
patent: 4094699 (1978-06-01), Fitzgerald
Takagi, et al., Chemical Abstracts, vol. 77, 128029Y (1972).
E. I. Du Pont de Nemours and Company
Rivers Diana G.
Tovar Jose
LandOfFree
Process for preparation of quinacridone pigments using moderatel does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for preparation of quinacridone pigments using moderatel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparation of quinacridone pigments using moderatel will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1182865