Non-migratory sulfonyl azide antioxidants

A sulfonyl azide antioxidant of the formula ##STR8## wherein:

• R.sub.1 is alkyl of from 1 to 12 carbon atoms, cyclohexyl, C.sub.7 -C.sub.10 alkyl-cyclohexyl, benzyl, or C.sub.8 -C.sub.11 alkylbenzyl;
• R.sub.2 is hydrogen or has one of the values assigned to R.sub.1, with the proviso that R.sub.1 and R.sub.2 together have at least 2 carbon atoms;
• g has a value of from 0 to 5;
• X is a divalent bridge member selected from --CH.sub.2 O--, --CH.sub.2 NH--, or ##STR9## m and n are each 1 or 2;
• and Z is, depending on the values of m and n, a divalent, trivalent or tetravalent group selected from:
• a. an alkylene group of from 2 to 5 carbon atoms when each of m and n is 1,
• b. a divalent or trivalent benzene group when n is 1 and m is 1 or when m is 1 and n is 2, and
• c. a divalent, trivalent or tetravalent group selected from naphthylene, diphenyl ether, and benzene groups when each of m and n is 1 or 2.