Process for mass pigmenting of synthetic polyamides

A process for pigmenting synthetic polyamide comprising pigmenting the polyamide in the mass with a compound of formula I or II ##STR143## in which R.sub.2 is hydrogen, trifluoromethyl, halogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, cyano, nitro, hydroxyl, amino, C.sub.1-4 alkylamino, di-(C.sub.1-4) alkylamino, phenylamino, N-C.sub.1-4 alkyl-N-phenylamino;

• acyl, acyloxy or acylamino,
• Me is a divalent metal atom;
• R.sub.1 is 1,2-phenylene, 1,2-, 2,3- or 1,8-naphthylene or 2,2'-diphenylene, the phenylene and naphthylene groups of R.sub.1 being unsubstituted or mono- or di-substituted by R.sub.2a where R.sub.2a has a significance of R.sub.2 other than hydrogen or by 3 or 4 halogen atoms;
• or in the naphthylene group two adjacent carbon atoms can be bridged by --NH--CO--NH--, --N.dbd.C(CH.sub.3)--NH--, --N.dbd.C(C.sub.6 H.sub.5)--NH--, --CO--N(C.sub.6 H.sub.5)--CO--, --CO--NH--CO--, ##STR144## R.sub.3 is ##STR145## where R is hydrogen or C.sub.1-4 alkyl unsubstituted or substituted by 1 to 4 groups selected from halogen, cyano, C.sub.1-4 alkoxy, phenyl, phenoxy, acyl, acyloxy or acylamino;
• and
• R.sub.4 together with the two carbon atoms to which it is attached forms a 5 or 6-membered carbocyclic or heterocyclic group or a 9- or 10-membered bicyclic carbocyclic or heterocyclic group, the rings of R.sub.4 being unsubstituted or substituted by 1, 2 or 3 groups R.sub.2a where R.sub.2a has a significance of R.sub.2 other than hydrogen or R.sub.4 is --NH--CO--C(CN).dbd.C(CH.sub.3)--, --N(CH.sub.3)--CO--C(CN).dbd.C(CH.sub.3)-- --N(C.sub.3 H.sub.7)--CO--C(CN).dbd.C(CH.sub.3)--, or --N(C.sub.6 H.sub.5)--CO--C(CN).dbd.C(CH.sub.3)--.