Hindered amine light stabilizers for polymers

A compound of the formula (I) ##STR7## wherein R.sup.1 represents hydrogen, or C.sub.1 -C.sub.4 alkyl;

• R.sup.2 represents hydrogen, hydroxy, or C.sub.1 -C.sub.8 alkoxy;
• R.sup.3 represents hydrogen, C.sub.1 -C.sub.8 alkyl, or benzyl;
• R.sup.4 and R.sup.5 independently represent C.sub.1 -C.sub.8 alkyl, benzyl, or phenethyl, or together with the carbon to which they are attached form a C.sub.5 -C.sub.10 cycloalkyl;
• and, R.sup.6 represents hydrogen, C.sub.2 -C.sub.3 hydroxyalkyl, C.sub.1 -C.sub.8 alkyl, hydroxy, or oxyl.