Hindered amine light stabilizers containing aromatic carboxy groups and derivatives

Abstract From the Canadian patent

Mindered amine light stabilizers are provided in which the hindered amine is attached to the nitrogen of an imide which also is attached to an aromatic group which contains a carboxy group which is a site for preparing unique derivatives, both polymeric and non-polymeric useful as, additives for preventing degradation of polymers and copolymers. The compounds have the structure: wherein R1 is selected from hydrogen and substituted or unsubstituted aliphatic, aryl or araliphatic; x is a substituted or unsubstituted secondary amino group; s is an integer of 1 to 100: and R4 is selected from hydroxy -0.theta. halogen or the residue from a substituted or unsubstituted, mono or polyfunctional …