Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic compound containing boron
Reexamination Certificate
2002-01-31
2003-08-12
Howard, Jacqueline V. (Department: 1764)
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic compound containing boron
C508S185000
Reexamination Certificate
active
06605572
ABSTRACT:
TECHNICAL FIELD
This invention relates to lubricating oil compositions. More particularly, this invention relates to lubricating oil compositions containing boron, relatively low levels of sulfur and as an optional ingredient relatively low levels of phosphorus.
BACKGROUND OF THE INVENTION
Engine lubricating oils require the presence of additives to protect the engine from wear. For over 40 years, the principal antiwear additive for engine lubricating oils has been zinc dialkyl dithiophosphate (ZDDP). However, ZDDP is typically used in the lubricating oil at a sufficient concentration to provide a phosphorus content of 0.10% by weight or higher in order to pass required industry standard tests for antiwear. Since phosphorus may result in the deactivation of emission control catalysts used in automotive exhaust systems, a reduction in the amount of phosphorus-containing additives (e.g., ZDDP) in the oil would be desirable. Additionally, the allowable level of sulfur in diesel and gasoline fuels is expected to drop to 15 parts per million (ppm) with zero sulfur fuel already being introduced in select locations. Therefore, a substantial portion of the sulfur in the emissions can, in the near future, be attributed to the lubricant. The problem therefore is to provide for a reduction in the amount of phosphorus- and sulfur-containing additives in lubricating oil compositions and yet provide such lubricating oil compositions with required antiwear properties. The present invention provides a solution to this problem by providing lubricating oil compositions containing additives that function as complete or partial replacements for ZDDP.
SUMMARY OF THE INVENTION
This invention relates to a lubricating oil composition, comprising: (A) a base oil and (B) a boron-containing compound represented by the formulae
wherein in Formulae (B-I), (B-II) and (B-III), each R is independently an organic group and any two adjacent R groups may together form a cyclic group; the lubricating oil composition containing sulfur, boron and optionally phosphorus with the ratio of sulfur to boron to phosphorus being represented by the formula
S
1
+5B
1
+3P
1
>0.35
wherein S
1
is the concentration in percent bit weight of sulfur in the composition, B
1
is the concentration in percent by weight of boron in the composition, and P
1
is the concentration in percent by weight of phosphorus in the composition; the concentration of sulfur in the lubricating oil composition being from about 0.01% to about 0.25% by weight; the concentration of phosphorus in the lubricating oil composition being up to about 0.08% by weight. In one embodiment, the composition further comprises (C) an acylated nitrogen-containing compound having a substituent of at least about 10 aliphatic carbon atoms. In one embodiment, the composition further comprises (D) an alkali or alkaline earth metal salt of an organic sulfur acid, a carboxylic acid or a phenol. In one embodiment, the composition further comprises (E) an alkali or alkaline(earth metal salt of a hydrocarbon-substituted saligenin. In one embodiment, the composition further comprises (F) a metal salt of a phosphorus-containing compound. In one embodiment, the composition further comprises (G) a dispersant viscosity index modifier. In one embodiment, the composition further comprises (H) one or more additional optional additives. The inventive composition may be made by blending components (A) and (B), and optionally one or more of components (C) to (H), using known blending techniques and any order of mixing or addition.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The term “hydrocarbyl” denotes a group having a carbon atom directly attached to the remainder of the molecule and having a hydrocarbon or predominantly hydrocarbon character within the context of this invention. Such groups include the following:
(1) Purely hydrocarbon groups; That is, aliphatic, (e.g., alkyl or alkenyl), alicyclic (e.g., cycloalkyl or cycloalkenyl), aromatic, aliphatic- and alicyclic-substituted aromatic, aromatic-substituted aliphatic and alicyclic groups, and the like, as well as cyclic groups wherein the ring is completed through another portion of the molecule (that is, any two indicated substituents may together form an alicyclic group). Such groups are known to those skilled in the art. Examples include methyl, ethyl, octyl, decyl, octadecyl, cyclohexyl, phenyl, etc.
(2) Substituted hydrocarbon groups; that is, groups containing non-hydrocarbon substituents which do not alter the predominantly hydrocarbon character of the group. Those skilled in the art will be aware of suitable substituents. Examples include hydroxy, nitro, cyano, alkoxy, acyl, etc.
(3) Hetero groups; that is, groups which, while predominantly hydrocarbon in character, contain atoms other than carbon in a chain or ring otherwise composed of carbon atoms. Suitable hetero atoms will be apparent to those skilled in the art and include, for example, nitrogen, oxygen and sulfur.
In general, no more than about three substituents or hetero atoms, and preferably no more than one, will be present for each 10 carbon atoms in the hydrocarbyl group.
Terms such as “alkyl-based,” “aryl-based,” and the like have meanings analogous to the above with respect to alkyl groups, aryl groups and the like.
The terms “hydrocarbon” and “hydrocarbon-based” have the same meaning and can be used interchangeably with the term hydrocarbyl when referring to molecular groups having a carbon atom attached directly to the remainder of a molecule.
The term “lower” as used herein in conjunction with terms such as hydrocarbyl, alkyl, alkenyl, alkoxy, and the like, is intended to describe such groups which contain a total of up to 7 carbon atoms.
The term “oil-soluble” refers to a material that is soluble in mineral oil to the extent of at least about one gram per liter at 25° C.
The term “TBN” refers to total base number. This is the amount of acid (perchloric or hydrochloric) needed to neutralize all or part of a material's basicity, expressed as milligrams of KOH per gram of sample.
The Lubricating Oil Composition
The inventive lubricating oil composition is comprised of one or more base oils which are generally present in a major amount (i.e. an amount greater than about 50% by weight). Generally, the base oil is present in an amount greater than about 60%, or greater than about 70%, or greater than about 75% by weight of the lubricating oil composition.
The inventive lubricating oil composition may have a viscosity of up to about 16.3 cSt at 100° C., and in one embodiment about 5 to about 16.3 cSt at 100° C., and in one embodiment about 6 to about 13 cSt at 100° C.
The inventive lubricating oil composition may have an SAE Viscosity Grade of 0W, 0W-20, 0W-30, 0W-40, 0W-50, 0W-60, 5W, 5W-20, 5W-30, 5W-40, 5W-50, 5W-60, 10W, 10W-20, 10W-30, 10W-40 or 10W-50.
The inventive lubricating oil composition contains sulfur, boron and optionally phosphorus. The ratio of sulfur to boron to phosphorus may be represented by the formula
S
1
+5B
1
+3P
1
>T
wherein S
1
is the concentration in percent bad weight of sulfur in the composition, B
1
is the concentration in percent by weight of boron in the composition, P
1
is the concentration in percent by weight of phosphorus in the composition, and T is the sum of S
1
+5B
1
+3P
1
. In one embodiment, T is greater than 0.35, and in one embodiment greater than 0.36, and in one embodiment greater than 0.38, and in one embodiment it is greater than 0.40, and in one embodiment greater than 0.42, and in one embodiment it is greater than 0.45, and in one embodiment it is greater than 0.50.
The inventive lubricating oil composition may have a sulfur content of about 0.01 to about 0.25% by weight, and in one embodiment about 0.02 to about 0.25% by weight, and in one embodiment about 0.03 to about 0.25% by weight, and in one embodiment about 0.04 to about 0.25% by weight, and in one embodiment about 0.05 to about 0.25%, and in one embodiment about 0.07 to about 0.25% by weight, and in one embodime
Abraham William D.
Bardasz Ewa A.
Carrick Virginia A.
Lamb Gordon D.
DuChez Neil A.
Esposito Michael F.
Howard Jacqueline V.
Shold David M.
The Lubrizol Corporation
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