| abstract |
A dyed or undyed polyamide substrate, preferably film, fiber, or an article manufactured therefrom, with excellent breaking strength retention and ultimate elongation retention, is prepared by reacting a sufficient number of amine and/or amide-forming functional groups of a hindered amine with the end groups of the polyamide precursor(s) at a temperature sufficient for polymerization to occur, to thereby bind the hindered amine to the polyamide and inhibit migration, leaching, and volatilization of the hindered amine. The hindered amine is represented by formula (I), in which R1 comprises the amine or amide-forming functional group; R2 is alkyl; and R3 is selected from the group consisting of hydrogen; alkyl of 1 to 3 carbons; and -OR4 in which R4 is selected from the group consisting of hydrogen, methyl, and alkyl of 1 to 7 carbons. The light stabilized polyamide substrate has particular utility in flags, decorative banners, and personal flotation device covers. |