Antioxidants and antioxidant boosters capable of producing hydroperoxyl radicals
AssigneeExxonMobil Research and Engineering Company
InventorsHaven Aldrich, Richard Schlosberg, Stanley Brois
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Abstract
An antioxidant which comprises a primary aliphatic hydroxyl group linked to an organic backbone such that upon oxidation a hydroperoxyl moiety capable of boosting the efficacy of free radical scavengers and hydroperoxide decomposer type antioxidants is generated in situ. The antioxidant is preferably a high hydroxyl polyol ester having a hydroxyl number ranging from about 30 to about 180 which ester is the reaction product of polyol and an acid which is at least fifty percent branched carboxylic acid, wherein the unconverted hydroxyl group is reacted with a facile leaving group, thereby producing free —CH2OH groups upon hydrolysis or oxidation.
Claims6
1-11. (canceled)
A graft having enhanced thermal-oxidative stability, the graft having the formula:
- B-A, wherein
- (a) B is selected from the group consisting of mineral oils, polyol esters, polyalpha olefins, fuels, oligomers, polymers, copolymers and mixtures thereof;
- and
- (b) A is selected from the group consisting of:
- (i) oxazolines, oxazolidines, amide esters, polyol esters and mixtures thereof;
- and
- (ii) a reaction product of a polyol diacrylate and a general antioxidant YH, wherein Y is selected from the group consisting of RS, R2N, (RO)2PHO, phenols and mixtures thereof,
- whereby A functions as antioxidants or antioxidant boosters.
Dependencies are inferred from the claim text.