Lubricating compositions and methods utilizing hydroxy thioethers
AssigneeThe Lubrizol Corporation
InventorsJerry Lee Musser, Frederick William Koch
Life of this patent
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Abstract
Lubricating compositions comprising a major amount of a lubricating oil and a minor amount of at least one additive of the formula: ##STR1## WHEREIN R is a hydrocarbon-based group of up to about 30 carbon atoms and having a valence of m + q; each R' is independently selected from hydrogen and a hydrocarbon-based group of up to about 20 carbon atoms; x and y are independently from 2 to 5; z is from zero to 5; q is from zero to 4 and m is from 1 to 5 with the proviso that m + q is from 1 to 6, have increased resistance to oxidative degradation and anti-wear properties.
Claims25
A transmission or railroad diesel lubricating composition comprising a major amount of a lubricating oil and a minor amount, sufficient to improve the oxidative stability of the lubricating composition, of one or more additives of the formula:
- ##STR17## wherein R is a hydrocarbyl or substituted hydrocarbyl containing up to about 30 carbon atoms, wherein the substituents for the substituted hydrocarbyl are selected from the group consisting of halo, nitro, lower alkoxy, lower alkylthio, and ##STR18## and R has a valence of m + q;
- each R' is independently selected from hydrogen, hydrocarbyl or substituted hydrocarbyl of up to about 20 carbon atoms, wherein the substituents for the substituted hydrocarbyl are selected from the group consisting of halo, nitro, lower alkoxy, lower alkylthio, and ##STR19## x and y are independently an integer of from 2 to 5;
- z is an integer of from zero to 5;
- q is an integer of from zero to 4;
- and m is an integer of from 1 to 5 with the proviso that the sum of m + q is from 1 to 6.
An automatic transmission lubricating composition comprising a major amount of a lubricating oil and a minor amount, sufficient to improve the oxidative stability of the lubricating composition, of at least one additive of the formula:
- ##STR20## wherein R is hydrocarbyl or substituted hydrocarbyl of up to about 30 carbon atoms, wherein the substituents for the substituted hydrocarbyl are selected from the group consisting of halo, nitro, lower alkoxy, lower alkylthio, and ##STR21## and R has a valence of m;
- each R' is independently selected from hydrogen, hydrocarbyl or substituted hydrocarbyl of up to about 20 carbon atoms, wherein the substituents for the substituted hydrocarbyl are selected from the group consisting of halo, nitro, lower alkoxy, lower alkylthio, and ##STR22## x and y are 2;
- z is an integer of from zero to 5;
- and m is an integer of 1 or 2.
In a transmission or railroad diesel lubricating composition comprising a major amount of a lubricating oil and from about 0.01 to about 20% by weight of the total composition of at least one dispersant, the improvement which comprises the incorporation of from about 0.01 to about 20.0% by weight of the total composition of one or more additives of the formula:
- ##STR23## wherein R is a hydrocarbyl or substituted hydrocarbyl containing up to about 30 carbon atoms, wherein the substituents for the substituted hydrocarbyl are selected from the group consisting of halo, nitro, lower alkoxy, lower alkylthio, and ##STR24## and R has a valence of m + q;
- each R' is independently selected from hydrogen, hydrocarbyl or substituted hydrocarbyl of up to about 20 carbon atoms, wherein the substituents for the substituted hydrocarbyl are selected from the group consisting of halo, nitro, lower alkoxy, lower alkylthio, and ##STR25## x and y are independently an integer of from 2 to 5;
- z is an integer of from zero to 5;
- q is an integer of from zero to 4;
- and m is an integer of from 1 to 5 with the proviso that the sum of m + q is from 1 to 6.
A concentrate, suitable for the preparation of transmission or railroad diesel lubricating compositions, which comprises a substantially inert, normally liquid organic diluent and from about 10% to about 90% of at least one additive of the formula:
- ##STR26## wherein R is hydrocarbyl or substituted hydrocarbyl containing up to about 30 atoms, wherein the substituents for the substituted hydrocarbyl are selected from the group consisting of halo, nitro, lower alkylthio, and ##STR27## and R has a valence of m + q;
- each R' is independently selected from hydrogen, hydrocarbyl or substituted hydrocarbyl of up to about 20 carbon atoms, wherein the substituents for the substituted hydrocarbyl are selected from the group consisting of halo, nitro, lower alkoxy, lower alkylthio, and ##STR28## x and y are independently an integer of from 2 to 5;
- z is an integer of from zero to 5;
- q is an integer of from zero to 4;
- and m is an integer of from 1 to 5 with the proviso that the total of m + q is from 1 to 6.
A method of lubrication in transmission or railroad diesel environments which comprises contacting a lubricating surface with an effective amount of a lubricating composition comprising a major amount of a lubricating oil and a minor amount sufficient to improve the oxidative stability of the lubricating composition of at least one additive of the formula:
- ##STR29## wherein R is hydrocarbyl or substituted hydrocarbyl containing up to about 30 carbon atoms, wherein the substituents for the substituted hydrocarbyl are selected from the group consisting of halo, nitro, lower alkoxy, lower alkylthio, and ##STR30## and R has a valence of m + q;
- each R' is independently selected from hydrogen, hydrocarbyl or substituted hydrocarbyl of up to about 20 carbon atoms, wherein the substituents for the substituted hydrocarbyl are selected from the group consisting of halo, nitro, lower alkoxy, lower alkylthio, and ##STR31## x and y are independently an integer of from 2 to 5;
- z is an integer of from zero to 5;
- q is an integer of from zero to 4;
- and m is an integer of from 1 to 5 with the proviso that the sum of m + q is from 1 to 6.
Dependencies are inferred from the claim text.