Lubricating compositions
AssigneeAfton Chemical Corporation
InventorsNubar Ozbalik, Kenji Yatsunami, Samuel Tersigni, Lee Saathoff
Life of this patent
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Abstract
There is provided an automatic transmission fluid composition comprising a major amount of a base oil; one or more friction modifiers, wherein total nitrogen content provided by the one or more friction modifiers is greater than or equal to about 300 ppm; and one or more ashless dispersants, wherein the total nitrogen content provided by the one or more ashless dispersants is greater than or equal to about 500 ppm. The automatic transmission fluid may have a kinematic viscosity at 100° C. of from about 4 cSt to about 6.5 cSt and a Brookfield viscosity at −40 ° C. of from about 4,000 cP to about 20,000 cP.
Claims27
An automatic transmission fluid composition comprising:
- (a) a major amount of a base oil;
- (b) one or more friction modifiers, wherein total nitrogen content provided by the one or more friction modifiers is greater than or equal to about 300 ppm;
- and
- (c) one or more ashless dispersants, wherein the total nitrogen content provided by the one or more ashless dispersants is greater than or equal to about 500 ppm;
- wherein the automatic transmission fluid has a kinematic viscosity at 100° C. of from about 4 cSt to about 6.5 cSt and a Brookfield viscosity at 40° C. of from about 4,000 cP to about 20,000 cP.
An automatic transmission fluid composition comprising:
- (a) a major amount of a base oil;
- (b) one or more friction modifiers selected from the group consisting of:
- (1) a succinimide of formula (I):
- wherein R is saturated or unsaturated, substituted or unsubstituted, and is selected from the group consisting of linear, branched, and cyclic radicals comprising from about 5 to about 30 carbon atoms and R′ is selected from the group consisting of hydrogen;
- alkyl, alkenyl, and aryl groups having from about 1 to 30 carbon atoms;
- and their heteroatom (nitrogen, oxygen or sulfur) containing analogues;
- (2) a bis-succinimide of formula (II):
- wherein R1 is a C6 to C30 isomerized alkenyl group, represented by:
- wherein x and y are independent integers whose sum is from 1 to 30, or its fully saturated alkyl analog,
- wherein R is independently selected from the group consisting of hydrogen, C1 to C25 straight or branched chain alkyl radicals, C1 to C12 alkoxy radicals, and C2 to C6 alkylene radicals,
- wherein a is an integer from 1 to 6, and
- wherein b is zero or an integer from 1 to 10;
- (3) an imidazoline of formula (III), (IV), or a mixture thereof:
- wherein R1 comprises a C3 to C30 straight chain or branched alkyl, alkenyl, aryl, or a heteroatom derivative thereof, or hydrocarbyl groups as oligomers/polymers derived from propylene isobutylene and higher olefins having terminal, internal, and vinylidene double bonds, and their heteroatom derivatives and wherein n ranges from 0 to 5;
- (4) an amine or an amide;
- and
- (c) one or more ashless dispersants;
- wherein the total nitrogen content in an automatic transmission fluid provided by the one or more friction modifiers is greater than or equal to about 300 ppm and the total nitrogen content provided by the one or more dispersants is greater than or equal to about 500 ppm and
- wherein the automatic transmission fluid has a kinematic viscosity at 100° C. of from about 4 cSt to about 6.5 cSt and a Brookfield viscosity at −40° C. of from about 4,000 cP to about 20,000 cP.
A method for improving the friction durability for an automatic transmission apparatus by using an effective amount of a power transmitting fluid comprising:
- (a) a major amount of a base oil;
- (b) one or more friction modifiers, wherein total nitrogen content provided by the one or more friction modifiers is greater than or equal to about 300 ppm;
- and
- (c) one or more ashless dispersants, wherein the total nitrogen content provided by the one or more ashless dispersants is greater than or equal to about 500 ppm;
- wherein the power transmitting fluid has a kinematic viscosity at 100° C. of from about 4 cSt to about 6.5 cSt and a Brookfield viscosity at −40° C. of from about 4,000 cP to about 20,000 cP.
An automatic transmission fluid top treat comprising:
- (a) one or more friction modifiers, wherein total nitrogen content provided by the one or more friction modifiers is greater than or equal to about 300 ppm;
- and
- (b) one or more ashless dispersants, wherein the total nitrogen content provided by the one or more ashless dispersants is greater than or equal to about 500 ppm.
Dependencies are inferred from the claim text.