Process for the preparation of organic pigments

Details Process for the preparation of organic pigments Process for the preparation of organic pigments

C - Chemistry, Metallurgy

09

B

C09B 48/00 (2006.01) C07D 471/04 (2006.01)

Patent

CA 2163400

This invention relates to a process for the preparation of quinacridone pigments comprising (a) heating, at a temperature of about 80°C to about 145°C, a reaction mixture comprising (i) 2,5-dianilinoterephthalic acid or a 2,5-dianilinoterephthalic acid derivative having one or more substituents in at least one aniline ring, (ii) about 2 to about 10 parts by weight, relative to component (a)(i), of a dehydrating agent, and (iii) about 0.01 to about 10 percent by weight, relative to component (a)(i), of a salt other than an iron salt; (b) drowning the reaction mixture from step (a) by adding said reaction mixture to about 3 to about 15 parts by weight, relative to component (a)(i), of a liquid in which the pigment is substantially insoluble; (c) isolating the quinacridone pigment; and (d) optionally, conditioning the quinacridone pigment.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-2057450