Claims
- 1. An antioxidant composition comprising
- (A) from about 10 to about 85 percent by weight of a hindered phenolic antioxidant;
- (B) from about 10 to about 85 percent by weight of 4,4'-bis(.alpha.,.alpha.-dimethylbenzyl) diphenyl amine; and
- (C) from about 1 to about 34 percent by weight of a phenothiazine compound represented by the formula ##STR3## wherein each R is independently hydrogen or an alkyl group having from 1 to about 12 carbon atoms; and
- wherein the weight ratio of component (A) to component (B) is from about 0.17:1 to about 5.67:1.
- 2. A composition of claim 1 wherein
- (a) component (A) is present in quantities of from about 20 to about 75 percent by weight;
- (b) component (B) is present in quantities of from about 20 to about 75 percent by weight;
- (c) component (C) is present in quantities of from about 2 to about 20 percent by weight; and
- (d) the weight ratio of component (A) to component (B) is from about 0.33:1 to about 3:1.
- 3. A composition of claims 1 or 2 wherein
- (a) said sterically hindered phenol is selected from the group consisting of
- 2,4-dimethyl-6-octyl phenol,
- 2,6-ditertiarybutyl-4-methyl phenol,
- 2,6-ditertiarybutyl-4-ethyl phenol,
- 2,6-ditertiarybutyl-4-n-butyl phenol,
- 2,2'-methylene bis(4-methyl-6-tertiarybutyl phenol),
- 2,2'-methylene bis(4-ethyl-6-tertiarybutyl phenol),
- 2,4-dimethyl-6-tertiarybutyl phenol,
- 4-hydroxymethyl-2,6-ditertiarybutyl phenol,
- n-octadecyl-beta(3,5-ditertiarybutyl-4-hydroxyphenyl) propionate,
- mixtures thereof and the like; and
- (b) said phenothiazine compound is selected from the group consisting of phenothiazine, 2-methylphenothiazine, 3-octylphenothiazine, 2,8-dimethylphenothiazine, 3,7-dimethylphenothiazine, 3,7-diethylphenothiazine, 3,7-dibutylphenothiazine, 3,7-dioctylphenothiazine, 2,8-dioctylphenothiazine, and mixtures thereof.
- 4. A composition of claim 3 wherein said sterically hindered phenol is selected from the group consisting of
- 2,4-dimethyl-6-octyl phenol,
- 2,6-ditertiarybutyl-4-methyl phenol,
- 2,6-ditertiarybutyl-4-ethyl phenol,
- 2,6-ditertiarybutyl-4-n-butyl phenol,
- 2,2'-methylene bis(4-methyl-6-tertiarybutyl phenol),
- 2,2'-methylene bis(4-ethyl-6-tertiarybutyl-phenol), and mixtures thereof.
- 5. A composition of claim 4 wherein the sterically hindered phenol is 2,6-ditertiarybutyl-4-methyl phenol and the phenothiazine compound is phenothiazine.
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 141,853 filed Apr. 21, 1980 U.S. Pat. No. 4,265,783.
US Referenced Citations (11)
Continuation in Parts (1)
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Number |
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141853 |
Apr 1980 |
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