申请人:Loebel Johannes
公开号:US20100184983A1
公开(公告)日:2010-07-22
A process for preparing perylene pigments of the general formula (Ia) or (Ib)
or mixtures thereof, by reacting perylenetetracarboxylic acids or functional derivatives thereof with aromatic diamines, where R
1
, R
2
may be the same or different and may each independently be phenylene, naphthylene or pyridylene, where R
1
, R
2
may each be mono- or polysubstituted by C
1
-C
22
-alkyl, C
3
-C
22
-alkenyl, C
1
-C
22
-alkoxy, hydroxyl and/or halogen, X
1
, X
2
, X
3
, X
4
, X
5
, X
6
, X
7
, X
8
may be the same or different and may each independently be hydrogen or halogen, wherein the reaction is performed in the presence of a secondary or tertiary amine in an aqueous reaction medium.