Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Heterocyclic ring compound; a heterocyclic ring is one...
Reexamination Certificate
2002-11-19
2004-06-01
McAvoy, Ellen M (Department: 1764)
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Heterocyclic ring compound; a heterocyclic ring is one...
C508S192000, C508S444000
Reexamination Certificate
active
06743759
ABSTRACT:
FIELD OF THE INVENTION
This application relates to improved antioxidant, antiwear/extreme pressure additive compositions and lubricating compositions containing the same.
BACKGROUND OF THE INVENTION
In U.S. Pat. No. 4,880,551, there are provided synergistic antioxidant compositions containing (a) 1-[di(4-octylphenyl)aminomethyl]tolutriazole and (b) an antioxidant selected from the group consisting of methylenebis(di-n-butyldithiocarbamate), 2,6-di-t-butyl-4-sec-butylphenol, 2,6-di-t-butyl-4-methylphenol and butylated phenol mixture and wherein the ratio of the tolutriazole compound to the antioxidant ranges from about 1:4 to about 4:1.
Surprisingly, it has been discovered that methylenebis(di-n-butyldithiocarbamate) when used in conjunction with a diphenylamine derivative of tolutriazole or benzotriazole (henceforth “benzotriazole derivative”) at a ratio of above about 4:1 to about 50:1, show similar synergistic effect with respect to antioxidant activity as the antioxidant compositions disclosed in U.S. Pat. No. 4,880,551 with ratios of 1:4 to 4:1 but with improved antiwear/extreme pressure (EP) performance in lubricants.
SUMMARY OF THE INVENTION
A first embodiment of the invention is an antioxidant composition with improved antiwear/extreme pressure performance which comprises: (a) methylenebis(di-n-butyldithiocarbamate) and (b) a diphenylamine derivative of tolutriazole or benzotriazole wherein the (a):(b) mass precent ratio ranges from above about 4:1 to about 50:1.
A second embodiment of the invention is an antioxidant composition with improved antiwear/extreme pressure performance containing methylenebis(di-n-butyldithiocarbamate) and a diphenylamine derivative of tolutriazole or benzotriazole at a ratio of about 5:1 to about 40:1.
A third embodiment of the invention is an antioxidant composition with improved antiwear/extreme pressure performance containing methylenebis(di-n-butyldithiocarbamate) and a diphenylamine derivative of tolutriazole or benzotriazole at a ratio of about 11.3:1 to about 38:1.
Another embodiment of the invention relates lubricating compositions having improved antioxidant, antiwear and extreme pressure properties which comprise a major portion of an oil of lubrication viscosity and oxidation inhibiting amount of the antioxidant composition of the invention.
Additionally it has been found that additional tolutriazole and benzotriazole derivatives are effective.
REFERENCES:
patent: 4648985 (1987-03-01), Thorsell
patent: 4880551 (1989-11-01), Doe
patent: 5308521 (1994-05-01), Pavilon
patent: 5885942 (1999-03-01), Zhang et al.
patent: 6083889 (2000-07-01), Angelo
patent: 6184262 (2001-02-01), Suhoza et al.
Donnelly Steven G.
Karol Thomas J.
Stunkel Brian W.
McAvoy Ellen M
Norris & McLaughlin & Marcus
R.T. Vanderbilt Company, Inc.
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