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US 5,207,938 AGranted
Method for retarding darkening of a dispersant-antioxidant olefin copolymer
AssigneeTexaco Inc.
InventorTheodore E. Nalesnik
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Abstract
A method of retarding the darkening effect of a unreacted, excess antioxidant amine in a DAOCP comprising: (a) reacting an organic compound with a finished DAOCP containing an unreacted excess antioxidant amine to form therewith an adduct product; and (b) recovering the DAOCP containing the formed adduct product, whereby the darkening of the DAOCP is retarded.
Claims6
A method of retarding the darkening effect of a unreacted, excess antioxidant amine in a Dispersant-Antioxidant olefin copolymer comprising:
- a) reacting a low molecular weight organic compound selected from the group consisting of an aldehyde, a ketone, an acid and an acid anhydride, with a finished Dispersant-Antioxidant olefin copolymer containing an unreacted excess antioxidant amine to form therewith, respectively, a corresponding adduct represented, respectively, by the following formulas:
- ##STR7## wherein n=0 or 1 and when n=1, then X=CH.sub.2, O, S or NH, and although R' .noteq. or = R, both R and R' each are H or a (C.sub.1 -C.sub.30) alkyl, a (C.sub.6 -C.sub.30) alkenyl or a (C.sub.7 -C.sub.30) alkylaryl group;
- and
- b) recovering said Dispersant-Antioxidant olefin copolymer containing said formed adduct, product, whereby the darkening of said Dispersant-Antioxidant olefin copolymer is retarded.
1 more element
Dependencies are inferred from the claim text.