Lubricating oil compositions containing dispersant additives

Claim 2

A lubricating oil composition comprising a major amount of an oil of lubricating viscosity and from 0.01 to 20 weight percent of the dispersant additive hydrocarbylpoly(oxyalkylene)aminocarbamates having a molecular weight of from about 600 to 10,000, at least one C 1 -C 30 hydrocarbyl-terminated poly(oxyalkylene) chain and at least one basic nitrogen atom; wherein said poly(oxyalkylene) chain comprises from one to five oxyalkylene units each containing from 9 to 30 carbon atoms and other oxyalkylene units selected from 2 to 5 carbon oxyalkylene units.

Claim 3

The composition according to claim 1 in which at least one of said basic nitrogen atoms in said aminocarbamate is in a primary or secondary amino group.

Claim 4

The composition according to claim 1 in which said aminocarbamate is of molecular weight from 600 to 5,000; contains one poly(oxyalkylene) chain; said poly(oxyalkylene) chain comprises oxyalkylene units selected from C 2 oxyalkylene units, C 3 -C 5 straight chain oxyalkylene units and branched chain C 3 oxyalkylene units; and said poly(oxyalkylene) chain contains one to five (C 9 -C 30 ) oxyalkylene units.

Claim 5

The composition according to claim 3 in which said poly(oxyalkylene) chain comprises oxypropylene units and one to five oxyalkylene units of about 14-22 carbon atoms each.

Claim 6

The composition according to claim 1 which is hydrocarbylpoly(C 2 -C 5 oxyalkylene)-(C 9 -C 30 oxy-1,2-alkylene)aminocarbamate.

Claim 7

The compoisition according to claim 5 in which is hydrocarbylpoly(oxypropylene) (C 14 -C 22 oxy-1,2-alkylene)-N-(2-aminoethyl)carbamate.

Claim 8

The composition according to claim 1 in which the amine moiety of said aminocarbamate is derived from a polyamine having from 2 to 12 amine nitrogen atoms and from 2 to 40 carbon atoms with a carbon:nitrogen ratio between 1:1 and 10:1.

Claim 9

The composition according to claim 7 in which said polyamine is a polyalkylene polyamine wherein the alkylene group contains from 2 to 6 carbon atoms and the polyamine contains 2 to 12 amine nitrogen atoms and 2 to 24 carbon atoms.

Claim 10

The composition according to claim 8 in which said polyamine is ethylene diamine.

Claim 11

A lubricating oil composition comprising a major amount of an oil of lubricating viscosity and a minor amount of the dispersant additive compound of the formula: ##STR6## wherein two R 3 groups attached to the same nitrogen atom and taken together with said nitrogen atom may form a 5 or 6 membered saturated or unsaturated nitrogen heterocyclic radical; wherein said heterocyclic radical may be substituted with substituents selected from: (A) hydrogen; (B) hydrocarbyl groups of from 1 to 10 carbon atoms; (C) acyl groups of from 2 to 10 carbon atoms; and (D) monoketo, monohydroxy, mononitro, monocyano, lower alkyl and lower alkoxy derivatives of the substituents of (B) and (C); wherein the remaining R 3 groups are the same or different substituents selected from (A), (B), (C), (D) and poly(oxyalkylene)oxycarbonyl groups of the formula: ##STR7## in which g is an integer from 2 to 5, x is an integer from 1 to 5; y is an integer such that the molecular weight of the poly(oxyalkylene)oxycarbonyl group is from about 500 to about 5,000; R is a hydrocarbyl group of from 1 to 30 carbon atoms; and R 4 is a hydrocarbyl group of from 7 to 28 carbon atoms; wherein the R 1 are the same or different alkylene, carbonyl, oxycarbonyl, or hydroxy-substituted alkylene radical of from 2 to 6 carbon atoms, and R 2 is carbonyl, alkylene carbonyl or alkylene of 2 to 4 carbon atoms with vicinal linkages; wherein at least one of the R 3 groups is said poly(oxyalkylene)oxycarbonyl group; wherein R 3 , R 1 and R 2 are selected such that at least one nitrogen atom is a basic nitrogen atom; and wherein a is 0 or 1, b is an integer 0 to 4, c is 0 or 1, d is 0 or 1, e is 0 or 1, f is 0 or 1 and equal to 1 when c is 0, and the sum f+b+2c+e is equal to or greater than 2.

Claim 12

A lubricating oil composition comprising a major amount of an oil of lubricating viscosity and a minor amount of the dispersant additive compound of the formula: ##STR6## wherein two R 3 groups attached to the same nitrogen atom and taken together with said nitrogen atom may form a 5 or 6 membered saturated or unsaturated nitrogen heterocyclic radical; wherein said heterocyclic radical may be substituted with substituents selected from: (A) hydrogen; (B) hydrocarbyl groups of from 1 to 10 carbon atoms; (C) acyl groups of from 2 to 10 carbon atoms; and (D) monoketo, monohydroxy, mononitro, monocyano, lower alkyl and lower alkoxy derivatives of the substituents of (B) and (C); wherein the remaining R 3 groups are the same or different substituents selected from (A), (B), (C), (D) and poly(oxyalkylene)oxycarbonyl groups of the formula: ##STR7## in which g is an integer from 2 to 5, x is an integer from 1 to 5; y is an integer such that the molecular weight of the poly(oxyalkylene)oxycarbonyl group is from about 500 to about 5,000; R is a hydrocarbyl group of from 1 to 30 carbon atoms; and R 4 is a hydrocarbyl group of from 7 to 28 carbon atoms; wherein the R 1 are the same or different alkylene, carbonyl, oxycarbonyl, or hydroxy-substituted alkylene radical of from 2 to 6 carbon atoms, and R 2 is carbonyl, alkylene carbonyl or alkylene of 2 to 4 carbon atoms with vicinal linkages; wherein at least one of the R 3 groups is said poly(oxyalkylene)oxycarbonyl group; wherein R 3 , R 1 and R 2 are selected such that at least one nitrogen atom is a basic nitrogen atom; and wherein a is 0 or 1, b is an integer 0 to 4, c is 0 or 1, d is 0 or 1, e is 0 or 1, f is 0 or 1 and equal to 1 when c is 0, and the sum f+b+2c+e is equal to or greater than 2.

Claim 13

The composition according to claim 10 in which x, f, a, and e are each equal to 1 and c and d are each 0.

Claim 14

The composition according to claim 11 in which all the R 3 groups, other than one poly(oxyalkylene)oxycarbonyl group, are selected from H, C 1 -C 6 alkyl and C 1 -C 6 hydroxyalkyl.

Claim 15

The composition according to claim 12 in which R 1 is propylene.

Claim 16

The composition according to claim 12 in which R 1 is ethylene.

Claim 17

The composition according to claims 1 or 10 wherein the dispersant additive is present in an amount of from about 0.5 to about 10% weight.