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US 8,933,004 B2Granted
Mineral oils containing phenolic antioxidants with improved color stability
AssigneeSi Group, Inc.
InventorsBo Liu, Vince J. Gatto, Gangkai Zhao
Life of this patent
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Abstract
This invention relates to a mineral oil containing hindered phenolic antioxidants with improved color stability. More particularly, it relates to non-coloring hindered phenolic blend that contains an oxygen scavenger, i.e., dibenzylhydroxyl amine (DBHA) as well as mineral oils containing such a blend.
Claims12
An antioxidant concentrate composition, suitable to prevent oxidation of a mineral oil, comprising:
- (i) about 0.1 to about 5 wt % of dibenzylhydroxylamine, about 0.1 to about 99.9 wt % of ortho-tert-butylphenol, and 0 to about 99.8 wt % of 2,6-di-tert-butylphenol, all wt % based on the total weight of the antioxidant concentrate composition, or
- (ii) about 5 to about 20 wt % of dibenzylhydroxylamine and about 80 to about 95 wt % of ortho-tert-butylphenol, all wt% based on the total weight of the antioxidant concentrate composition
- (iii) about 0.1 to about 5 wt % of dibenzylhydroxylamine, about 30 to about 95wt % of 3,5-di-tert-butyl-4-hydroxyphenylhydrocinnamic acid, C7-C9 branched alkyl esters, and 0 to about 70 wt % of 2,6-di-tert-butylphenol, all wt % based on the total weight of the antioxidant concentrate composition, or
- (iv) about 0.1 to about 5 wt % of dibenzylhydroxylamine and about 95 to about 99.9 wt % of 4,4′-methylenebis(2,6-di-tert-butylphenol), all wt % based on the total weight of the antioxidant concentrate composition.
1 more element
A mineral oil composition comprising mineral oil, dibenzylhydroxylamine and at least one hindered phenol selected from the group consisting of:
- ortho-tert-butylphenol,
- 2,6-di-tert-butylphenol,
- 3,5-di-tert-butyl-4-hydroxyphenylhydrocinnamicacid, C7-C9 branched alkyl esters,
- 4,4′-methylenebis(2,6-di-tert-butylphenol), and mixtures thereof.
1 more element
A method of reducing the color of mineral oils comprising the steps of:
- contacting dibenzylhydroxylamine with a mineral oil to form a mineral oil composition;
- heating the mineral oil composition at a temperature of from about room temperature to about 120° C.
Dependencies are inferred from the claim text.