Lubricating oil compositions suitable for use in medium speed diesel engines

• US 6,162,769 A
• Filed: 03/23/1999
• Issued: 12/19/2000
• Est. Priority Date: 03/26/1998
• Status: Expired due to Term

• Current Assignee: Chevron Centrale Laboratoria BV (Chevron Corp.)
• Original Assignee: Chevron Centrale Laboratoria BV (Chevron Corp.)
• Inventors: Polhaar, Gerardus J. E., Vrolijk, Dick J. E.
• Primary Examiner(s): Howard, Jacqueline V.
• Application Number:
  US09/274,631
• Time in Patent Office: 637 Days
• Field of Search: 508/333, 508/339, 508/460, 508/574
• US Class Current: 508/339
• CPC Class Codes: C10M 133/56 Amides; Imides
• CPC Class Codes: C10M 137/10 Thio derivatives
• CPC Class Codes: C10M 159/12 Reaction products
• CPC Class Codes: C10M 159/22 containing phenol radicals
• CPC Class Codes: C10M 163/00 Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
• CPC Class Codes: C10M 2207/028 Overbased salts thereof
• CPC Class Codes: C10M 2207/262 derived from hydroxy substituted aromatic acids, e.g. salicylates
• CPC Class Codes: C10M 2215/04 having amino groups bound to acyclic or cycloaliphatic carbon atoms
• CPC Class Codes: C10M 2215/064 Di- and triaryl amines
• CPC Class Codes: C10M 2215/086 Imides
• CPC Class Codes: C10M 2215/26 Amines
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2217/046 Polyamines, i.e. macromoleculars obtained by condensation of more than eleven amine monomers
• CPC Class Codes: C10M 2217/06 Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
• CPC Class Codes: C10M 2219/087 containing hydroxy groups; Derivatives thereof, e.g. sulfurised phenols
• CPC Class Codes: C10M 2219/088 Neutral salts
• CPC Class Codes: C10M 2219/089 Overbased salts
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10M 2227/00 Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
• CPC Class Codes: C10N 2010/04 Groups 2 or 12
• CPC Class Codes: C10N 2070/02 : Concentrating of additives

Abstract

A lubricating oil composition reduces the adverse effects of oxidation in a medium speed diesel engine. That lubricating oil composition has a major amount of a base oil of lubricating viscosity, from 1% to 30% of a highly overbased oil-soluble sulfurized alkaline earth metal hydrocarbyl phenate-carboxylate and from 0.1% to 5% of a polyalkylene succinimide prepared by reacting under reactive conditions a mixture of an alkenyl or alkylsuccinic acid derivative, an unsaturated acidic reagent copolymer of an unsaturated acidic reagent and an olefin, and a polyamine. When that lubricating oil composition has 0.1% to 2% of a physical mixture of from 20% to 90% of a zinc dialkyldithiophosphate derived from only primary alkyl alcohols, and from 10% to 80% of a zinc dialkyldithiophosphate derived from only secondary alkyl alcohols, the lubricating oil composition is useful for increasing the water tolerance of a medium speed diesel engine that are susceptible to water contamination.

Claims

1. A lubricating oil composition suitable for use in medium speed diesel engines, wherein said lubricating oil composition comprises:

(a) a major amount of a base oil of lubricating viscosity;

(b) from 1% to 30% of an oil-soluble sulfurized alkaline earth metal hydrocarbyl phenate modified by incorporation of from 2% to 40% of at least one of the following;

(1) carboxylic acid or anhydride, acid chloride or ester thereof;

(2) dicarboxylic acid or anhydride, acid chloride or ester thereof; and

(3) polycarboxylic acid or anhydride, acid chloride or ester thereof;

wherein said modified alkaline earth metal hydrocarbyl phenate has a BN of at least 225 milligrams of KOH/gram; and

(c) from 0.1% to 5% of a polyalkylene succinimide prepared by reacting a mixture under reactive conditions, wherein the mixture comprises;

(1) an alkenyl or alkylsuccinic acid derivative;

(2) an unsaturated acidic reagent copolymer of an unsaturated acidic reagent and an olefin; and

(3) a polyamine.

2. A lubricating oil composition according to claim 1 wherein said modified alkaline earth metal hydrocarbyl phenate is an oil-soluble sulfurized calcium alkylphenate modified by incorporation of from 12% to 22% of carboxylic acid, wherein the alkyl group has from 9 to 20 carbon atoms.

3. A lubricating oil composition according to claim 2 wherein said carboxylic acid is stearic acid.

4. A lubricating oil composition according to claim 1 wherein the alkenyl or alkyl substituent of said alkenyl or alkylsuccinic acid derivative has a Mn of from 1800 to 3000, wherein said unsaturated acidic reagent is maleic anhydride, wherein said olefin has an average of from 12 to 28 carbon atoms, wherein said copolymer has a Mn of from 2000 to 4800, and wherein said polyamine has at least three nitrogen atoms and from 4 to 20 carbon atoms.

5. A lubricating oil composition according to claim 4 wherein said alkenyl or alkylsuccinic acid derivative is derived from polybutenes having a number average molecular weight of from 2000 to 2400, and wherein said mixture contains from 0.4 to 0.6 equivalents of said polyamine per equivalent of alkenyl or alkylsuccinic acid derivative plus unsaturated acidic reagent copolymer.

6. A lubricating oil composition according to claim 4, wherein said polyalkylene succinimide is treated with a cyclic carbonate or a linear mono- or poly-carbonate under reactive conditions.

7. A lubricating oil composition according to claim 4 wherein said cyclic carbonate is ethylene carbonate.

8. A lubricating oil composition according to claim 1 further comprising from 0.1% to 2% of at least one zinc dithiophosphate wear-inhibition additive.

9. A lubricating oil composition according to claim 8 wherein said zinc dithiophosphate wear-inhibition additive is a zinc dialkyldithiophosphate derived from primary alcohols.

10. A lubricating oil composition according to claim 8 wherein said zinc dithiophosphate wear-inhibition additive is a physical mixture of:

(a) from 20% to 90% of a zinc dialkyldithiophosphate derived from only primary alkyl alcohols, and

(b) from 10% to 80% of a zinc dialkyldithiophosphate derived from only secondary alkyl alcohols.

11. A lubricating oil composition according to claim 10 wherein said wear-inhibition additive is a physical mixture of:

(a) from 40% to 80% of a zinc dialkyldithiophosphate derived from only primary alkyl alcohols, and

(b) from 20% to 60% of a zinc dialkyldithiophosphate derived from only secondary alkyl alcohols;

wherein all of the alkyl groups of all the zinc dialkyl-dithiophosphates have from three to twenty carbon atoms.

12. A lubricating oil composition according to claim 11 wherein said wear-inhibition additive is a physical mixture of:

(a) from 40% to 80% of a zinc dialkyldithiophosphate derived from 2-ethylhexanol, and

(b) from 20% to 60% of a zinc dialkyldithiophosphate derived from a mixture of 2-butanol and 4-methyl-2-pentanol.

13. A method for reducing the effects of oxidation in a medium speed diesel engine, said method comprising lubricating said medium speed diesel engine with the lubricating oil composition according to claim 1.

14. A method for increasing the water tolerance of a medium speed diesel engine that are susceptible to water contamination, said method comprising lubricating said medium speed diesel engine with the lubricating oil composition according to claim 10.

15. A concentrate comprising:

(a) from 20% to 80% of a diluent;

(b) an oil-soluble sulfurized alkaline earth metal hydrocarbyl phenate modified by incorporation of from 2% to 40% of at least one of the following;

(1) carboxylic acid or anhydride, acid chloride or ester thereof;

(2) dicarboxylic acid or anhydride, acid chloride or ester thereof; and

(3) polycarboxylic acid or anhydride, acid chloride or ester thereof;

wherein said modified alkaline earth metal hydrocarbyl phenate has a BN of at least 225 milligrams of KOH/gram; and

(c) a polyalkylene succinimide prepared by reacting a mixture under reactive conditions, wherein the mixture comprises;

(1) an alkenyl or alkylsuccinic acid derivative;

(2) an unsaturated acidic reagent copolymer of an unsaturated acidic reagent and an olefin; and

(3) a polyamine.

16. A process for producing a lubricating oil composition comprising blending a mixture comprising:

(a) a major amount of a base oil of lubricating viscosity;

(b) from 1% to 30% of an oil-soluble sulfurized alkaline earth metal hydrocarbyl phenate modified by incorporation of from 2% to 40% of at least one of the following;

(1) carboxylic acid or anhydride, acid chloride or ester thereof;

(2) dicarboxylic acid or anhydride, acid chloride or ester thereof; and

(3) polycarboxylic acid or anhydride, acid chloride or ester thereof;

wherein said modified alkaline earth metal hydrocarbyl phenate has a BN of at least 225 milligrams of KOH/gram; and

(c) from 0.1% to 5% of a polyalkylene succinimide prepared by reacting a mixture under reactive conditions, wherein the mixture comprises;

(1) an alkenyl or alkylsuccinic acid derivative;

(2) an unsaturated acidic reagent copolymer of an unsaturated acidic reagent and an olefin; and

(3) a polyamine.

17. A lubricating oil composition produced by the process according to claim 16.