Isoindolinpigmente auf Basis von Aminochinoxalindionen

Isoindoline pigments of formula (I) are claimed, where R and R are each CN; Q is -CO-NR R or -CO-NR R ; or R +R = R ; Q is a (non)satd. (non)aromatic 5-7-membered heterocyclic ring system, opt. modified by condensn. or bridging to other heterocyclic or isocyclic ring systems, in which the hetero-atoms are N, O and/or S; R and R are each H or 1-4C alkyl; R is Q, opt. mono- to penta-substd. by 1-4C alkyl, halogen, CF3, 1-4C alkoxy, carbo(m)ethoxy, carbonamido (opt. substd. by 1-4C alkyl or phenyl), NO2, 1-4C acylamino or OH; R is H, 1-4C alkyl, phenyl, 1-4C alkoxy, halogen or 1-4C acylamino; R is H, 1-4C alkyl, halogen, CF3, OMe, OEt or NO2; m = 1-4; n = 1-3; and R is H or 1-4C alkyl. (I) are prepd. by reacting (a) an isoindoline cpd. (II) of formula (A: X and Y are gps. X and Y capable of nucleophilic exchange in the 1- and 3-positions) with (b) a cpd. of formula R -CH2-R (III), giving a cpd. (IV) of formula (A: X is CR R ); and then (b) reacting (IV) with a quinoxalindione of formula (V), esp. a 6-aminoquinoxalindione. In (III), X is pref. imino, (hemi)acetal or ketal gp.; and Y is pref. an imino gp.. In (II), H atoms in the -CH2- gp. are CH-acids. Stage (a) is carried out at 30-60, pref. 45-55 degrees C and pH 5-9, pref. 6-8.5.