Process for making azo pigments

Details Process for making azo pigments Process for making azo pigments

1989-03-29

1990-04-24

Higel, Floyd D.

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

Organic compounds

Azo

534575, 534583, 534739, 534839, 534863, 534876, 534887, C09B 2938, C09B 3508, C09B 3700, C09B 4100

Patent

active

049202065

ABSTRACT:
Azo Pigments are made by subjecting a diazo component to an azo coupling reaction with the equivalent quantity of a coupling component difficultly soluble at less than 65.degree. C. in the aqueous/acid and aqueous
eutral pH-ranges. More specifically, an aqueous/acid-solution of the diazo component is continuously mixed at a temperature of less than 65.degree. C. within a period of less than 1 minute with the aqueous/alkaline solution of the coupling component and a predetermined pH between 2 and 9 is established by controlling the flow of the mass streams of diazo component and coupling component; in this way a portion of the coupling component is caused to undergo immediate reaction to the azo pigment to be made whereas the balance portion of the coupling component simultaneously commences precipitating as finely crystalline reactive matter, which is reacted in a post-reaction phase with unreacted diazo component to give the azo pigment to be made.

Affiliated with

Also associated with

Rating

Process for making azo pigments 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 making azo pigments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for making azo pigments will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-35467