Compounds useful as pigments containing one or more 2,2,6,6-tetraalkylpiperidine groups

A polymeric composition comprising a polymeric material pigmented with a pigment of formula I or II ##STR35## in which R is hydrogen, C.sub.1-8 alkyl, C.sub.3-10 alkenyl, phenyl, phenyl-C.sub.1-4 alkyl or --COR.sub.5a where R.sub.5a is hydrogen, --C(R.sub.10a).dbd.CH.sub.2, C.sub.1-6 alkyl, phenyl, --COOC.sub.1-4 alkyl or --NR.sub.21 R.sub.22, where R.sub.10a is hydrogen or C.sub.1-4 alkyl;

• R.sub.21 is hydrogen, C.sub.1-12 alkyl, C.sub.5-6 cycloalkyl, phenyl, phenylC.sub.1-4 alkyl or C.sub.1-12 alkylphenyl and R.sub.22 is C.sub.1-12 alkyl or hydrogen;
• each R.sub.1 independently is --CH.sub.3 or --CH.sub.2 (C.sub.1-4 alkyl) or both groups R.sub.1 form a group --(CH.sub.2).sub.5--;
• each R.sub.2 independently is --CH.sub.3 or --CH.sub.2 (C.sub.1-4 alkyl) or both groups R.sub.2 form a group --(CH.sub.2).sub.5 --;
• R.sub.4 is a direct bond or a bridging group and
• R.sub.5 is hydrogen or C.sub.1-4 alkyl, or
• R.sub.4 and R.sub.5 together with the carbon atom to which they are attached form an isocyclic or heterocyclic bridging group;
• R.sub.6 is --NH.sub.2, mono or di--C.sub.1-4 alkylamino, C.sub.1-2 alkylcarbonylamino, benzoylamino, hydrogen, OH or --CO--C.sub.1-4 alkyl or --CO--C.sub.1-4 alkoxy and
• R.sub.7 is hydrogen or C.sub.1-4 alkyl, or
• R.sub.6 or R.sub.7 together with the carbon atom to which they are attached form an isocyclic or heterocyclic ring;
• R.sub.8 is a direct bond or a bridging group;
• D is a residue of a pigment;
• and
• n is an integer from 1 to 4 inclusive.