Process for the manufacture of the gamma-crystal modification of

Details Process for the manufacture of the gamma-crystal modification of Process for the manufacture of the gamma-crystal modification of

1978-10-19

1980-07-15

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

106288Q, C09B 4800

Patent

active

042129753

ABSTRACT:
Unsubstituted linear trans-quinacridone of the gamma-crystal modification is obtained by cyclization of 2,5-dianilino-terephthalic acid with the 2.5 to 4-fold quantity of polyphosphoric acid or of an acidic polyphosphoric acid methyl ester, followed by hydrolysis of the condensation product in water, intensive grinding of the aqueous crude quinacridone in the presence of an alcohol or ketone and heating of the resulting product to 80.degree. to 200.degree. C.

REFERENCES:
patent: 3257405 (1966-06-01), Gerson et al.
patent: 3265699 (1966-08-01), Jaffe
patent: 4100162 (1978-07-01), North

Affiliated with

Also associated with

Rating

Process for the manufacture of the gamma-crystal modification of 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 the manufacture of the gamma-crystal modification of, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the manufacture of the gamma-crystal modification of will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-464781