Patent ID: 7323511

Claim:
An antioxidant polymer, comprising at least one repeat unit that is represented by a structure selected from the group consisting of Structural Formulas (I), (II), (III), (IV) and combinations thereof: wherein: R′ is a covalent bond, —O—, —C(O)O—, —C(O)N—, —C(O)—, —CH═CH—, —S— or —N—; R 1 is —H or an alkyl group, or —(CH 2 ) k —O—X—Z; each X is independently a covalent bond, —C(O)—, —C(O)O— or —C(O)N—; Y is —O—, —N— or —S—; each Z is an independently selected antioxidant; a is an integer from 0 to 12; each k is independently an integer from 0 to 12; m is an integer from 0 to 6; n is 0 or 1; and p is an integer from 0 to 6, and wherein when the repeat unit is represented by Structural Formula (I), (II) or (III), Z is selected from the group consisting of a 4-acetoxy-3-tert-butylphenyl group, a 3-alkoxycarbonyl-2,6-dihydroxyphenyl group, a 3-propoxycarbonyl-2,6-dihydroxyphenyl group, a 3,5-di-tert-butyl-2-hydroxyphenyl group, a 3-tert-butyl-4-hydroxyphenyl group, a 2,6-di-tert-butyl-4-mercaptophenyl group, a 2,6-di-tert-butyl-4-hydroxyphenyl group, a 3,4-methylenedioxyphenyl group, a 3,5-di-tert-butyl-4-hydroxybenzenethiol, 2-(3,5-di-tert-butyl-4-hydroxyphenyl) acetic acid, 3,5-di-tert-butyl-4-hydroxybenzoic acid, 3,5-di-tert-butyl-4-hydroxycinnamic acid, alkyl gallates, 3,5-di-tert-butyl-4-hydroxybenzyl alcohol, tert-butyl-hydroquinone, 2,5-di-tert-butyl-hydroquinone, 2,6-di-tert-butyl-hydroquinone, 3,5-di-tert-butyl-4-hydroxybenzaldehyde, monoacetoxy-tert-butylhydroquinone, sesamol, isoflavones, flavanoids and coumarins.