Process for the photochemical and thermal stabilization of polyamide fibre material with a copper complex having fibre-affinity and an oxalic acid diarylamide

A process for the photochemical and thermal stabilisation of polyamide fibre material, which comprises treating said fibre material with a composition comprising a water-soluble oxalic acid diamide having fibre-affinity of general formula ##STR52## wherein R.sub.1 and R.sub.2 are each independently of the other hydrogen, unsubstituted C.sub.1 -C.sub.18 alkoxy or C.sub.1 -C.sub.18 alkoxy which is substituted by halogen, hydroxy, C.sub.1 -C.sub.5 alkoxy, carboxyl groups, carbamyl groups or C.sub.1 -C.sub.12 alkoxycarbonyl groups, or is C.sub.3 -C.sub.5 alkenyloxy, unsubstituted benzyloxy or benzyloxy which is substituted by halogen or C.sub.1 -C.sub.5 alkyl, aliphatic acyloxy containing up to 18 carbon atoms, unsubstituted benzoyloxy or benzoyloxy which is substituted by halogen or C.sub.1 -C.sub.4 alkyl, or is a radical of formula --A--SO.sub.3 M,

• A is a direct bond or a divalent radical of formula --O--Q--, and
• Q is unsubstituted or hydroxy-substituted C.sub.1 -C.sub.6 alkylene, M is hydrogen or alkali metal,
• R.sub.3 and R.sub.4 are each independently of the other hydrogen, halogen, C.sub.1 -C.sub.12 alkyl, haloalkyl, phenyl or phenyl-C.sub.1 -C.sub.5 alkyl, or two radicals R.sub.3 and/or R.sub.4 in ortho-position each together form a fused 6-membered aromatic carbon ring, and wherein m and n are 1 or 2 and p and q are 1, 2 or 3, and with the proviso that the compound of formula (1) contains at least one sulfo group,
• and a copper complex of formula ##STR53## wherein R' is hydrogen or C.sub.1 -C.sub.5 alkyl,
• R.sub.5, R.sub.6, R.sub.7 and R.sub.8 are each hydrogen, halogen, hydroxy, hydroxyalkyl, C.sub.1 -C.sub.5 alkyl, C.sub.1 -C.sub.5 alkoxy, alkoxyalkoxy, alkoxyalkoxyalkoxy, carboxymethoxy, alkylamino, dialkylamino, --SO.sub.2 NH.sub.2, --SO.sub.2 NHR, sulfo or --SO.sub.2 N(R).sub.2,
• R is C.sub.1 -C.sub.5 alkyl or C.sub.1 -C.sub.5 alkoxyalkyl or
• R.sub.5 and R.sub.6 or R.sub.6 and R.sub.7 or R.sub.7 and R.sub.8, together with the linking carbon atoms, are a radical of the benzene series,
• X.sub.1 and Y.sub.1 are each hydrogen, C.sub.1 -C.sub.5 alkyl or an aromatic radical, or
• X.sub.1 and Y.sub.1, together with the linking carbon atoms, form a cycloaliphatic radical of 5-7 carbon atoms,
• or a copper complex of formula ##STR54## wherein R.sub.9 and R.sub.10 are each independently of the other an unsubstituted or substituted C.sub.1 -C.sub.5 alkyl or aryl radical,
• or a copper complex of phenols of formula ##STR55## wherein R.sub.11 is hydrogen, hydroxy, alkyl or cycloalkyl, and the ring A may carry further substituents.