"Preferred hindered aryl amines according to the present invention have the following structure: wherein each or R1 and R2 is H, alkyl or substituted alkyl, at least one of R1 and R2 being other than H, and each R3 is independently H, alkyl, or substituted alkyl, or two adjacent R3 moieties may be taken together to form a fused aromatic, aliphatic, or unsaturated aliphatic ring." . . . . .