Lubricating compositions containing a carboxylic functionalised polymer and dispersant

Patent metadata

Field	Value
Publication number	US-9644167-B2
Application number	US-201514951690-A
Country	US
Kind code	B2
Filing date	Nov 25, 2015
Priority date	Feb 26, 2009
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

The invention provides an oil of lubricating viscosity, a dispersant and an amine-functionalized additive, wherein the amine-functionalized additive is derived from an amine having at least 3 or 4 aromatic groups. The invention further relates to the use of the lubricating composition in an internal combustion engine.

First claim

What is claimed is:

1. A lubricating composition comprising an oil of lubricating viscosity, a polyisobutylene succinimide dispersant, a dispersant viscosity modifier and an amine-functionalised additive,
wherein the polyisobutylene succinimide dispersant is derived from a polyisobutylene having a molecular weight or 750 to 2500,
wherein the amine-functionalised additive is derived from an amine having at least 3 aromatic groups, the amine having at least 3 aromatic groups selected from the group consisting of
a) amines represented by the formula:

 wherein independently each variable
R 1 is hydrogen or a C 1-5 alkyl group;
R 2 is hydrogen or a C 1-5 alkyl group;
U is an aliphatic, alicyclic or aromatic group, with the proviso that when U is aliphatic, the aliphatic group may be a linear or branched alkylene group containing 1 to 5 carbon atoms; and
w is 1 to 10:

b) bis[p-(p-aminoanilino)phenyl]-methane, 2-(7-amino-acridin-3-ylmethyl)-N-4-{4-[4-(4-amino-phenylamino)-benzyl]-phenyl}-benzene-1,4-diamine, or mixtures thereof, and
c) amines obtained/obtainable by a process comprising reacting: (1) isatoic anhydride or alkyl substituted isatoic anhydride and (2) an aromatic amine with at least two aromatic groups and a primary or a reactive secondary amino group,
wherein the amine-functionalised additive is a product obtained by reacting the amine having at least 3 aromatic groups with a carboxylic functionalised polymer, and
wherein the dispersant viscosity modifier is either:
prepared by grafting of an olefinic carboxylic acid acylating agent onto a polymer of 15 to 80 mole percent of ethylene, from 20 to 85 mole percent of C 3-10 alpha monoolefin, and from 0 to 15 mole percent of non-conjugated diene or triene, said polymer having an average molecular weight ranging from 5000 to 500,000, and further reacting said grafted polymer with an amine,
or
a reaction product of: (a) a polymer comprising carboxylic acid functionality or a reactive equivalent thereof, said polymer having a number average molecular weight of greater than 5,000; and (b) an amine component comprising at least one aromatic amine containing at least one amino group capable of condensing with said carboxylic acid functionality to provide a pendant group and at least one additional group comprising at least one nitrogen, oxygen, or sulfur atom, wherein said aromatic amine is selected from the group consisting of (i) a nitro-substituted aniline, (ii) an amine comprising two aromatic moieties linked by a —C(O)NR— group, a —C(O)O— group, an —O— group, an —N═N— group, or an —SO 2 — group where R is hydrogen or hydrocarbyl, one of said aromatic moieties bearing said condensable amino group, (iii) an aminoquinoline, (iv) an aminobenzimidazole, (v) an N,N-dialkylphenylenediamine, and (vi) a ring-substituted benzylamine.

2. The lubricating composition of claim 1 , wherein the amine-functionalised additive is derived from an amine having at least 4 aromatic groups, at least one —NH 2 functional group, and at least 2 secondary or tertiary amino groups.

3. The lubricating composition of 1 , wherein the carboxylic functionalised polymer is a polyisobutylene succinic anhydride.

4. The lubricating composition of claim 3 , wherein the polyisobutylene succinic anhydride is derived from a polyisobutylene with number average molecular weight of 350 to 5000.

5. The lubricating composition of claim 1 , wherein the carboxylic functionalised polymer is a hydrogenated copolymer of styrene-butadiene.

6. The lubricating composition of claim 1 , wherein the carboxylic functionalised polymer is an ethylene-propylene copolymer with maleic anhydride.

7. The lubricating composition of claim 1 , wherein the carboxylic functionalised polymer is a hydrogenated styrene-isoprene polymer.

8. The lubricating composition of claim 1 , wherein the succinimide dispersant is derived from an aliphatic polyamine, or mixtures thereof.

9. The lubricating composition of claim 8 , wherein the aliphatic polyamine is an ethylenepolyamine, a propylenepolyamine, a butylenepolyamine, or mixtures thereof.

10. The lubricating composition of claim 8 , wherein the aliphatic polyamine is selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, polyamine still bottoms, and mixtures thereof.

11. The lubricating composition of claim 1 , wherein the lubricating composition is characterised as having (i) a sulphur content of 0.5 wt % or less, (ii) a phosphorus content of 0.1 wt % or less, and (iii) a sulphated ash content of 1.5 wt % or less.

12. The lubricating composition of claim 1 further comprising at least one of an antiwear agent, a dispersant viscosity modifier, a friction modifier, a viscosity modifier, an antioxidant, an overbased detergent, or mixtures thereof.

13. The lubricating composition of claim 1 , wherein the amine-functionalised additive is derived from an amine having at least 4 aromatic groups.

14. The lubricating composition of claim 1 , wherein the polyisobutylene succinimide dispersant has a carbonyl to nitrogen ratio of 1:1 to 1:1.3.

15. A method of lubricating an internal combustion engine comprising supplying to the internal combustion engine the lubricating composition of claim 1 .

Assignees

• Lubrizol Corp

Inventors

• Gieselman Matthew D
• Pudelski John K
• Galic Raguz Mary
• Derevjanik Thomas S

Classifications

• C10N2030/36

  Seal compatibility, e.g. with rubber · CPC title

• C10N2030/42

  Phosphor free or low phosphor content compositions · CPC title

• C10N2040/25

  Internal-combustion engines · CPC title

• C10N2030/45

  Ash-less or low ash content · CPC title

• C10N2030/041

  Soot induced viscosity control · CPC title