| abstract |
1-Hydrocarbyloxy hindered amine mercaptoacid esters, thioacetals, sulfides and disulfides are effective light stabilizers for protecting a variety of polymer substrates from the deleterious effects of actinic light. These compounds are selected from compounds of the formulae (see above formula I) (see above formula II) (see above formula III) (see above formula IV) (see above formula V) (see above formula VI) (see above formula VII) (see above formula VIII), or (see above formula IX) in which x is 1 or 2, R1 and R2 are independently, for example, methyl or ethyl, R3 is C1-C3 alkylene, E is, for example, C1-C18 alkyl, T1 is, for example, 1,1-C1-C18 alkylidene, T2 is CH-R4-CH in which R4 is, for example, C1-C10 alkylene, L is a carbonyl group containing moiety, or may be a C2H4-containing-cyano or -phospho group, and L1 may be H or the same as L. |