# US 9,040,470 B2 · Lubricating oil composition for sliding section comprising aluminum material, and lubricating method

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- Number: US 9,040,470 B2
- Document ID: US9040470B2
- Status: Granted
- Kind: B2
- Application number: 13/885,904
- Filed: 2011-07-26
- Published: 2013-09-12
- Granted: 2015-05-26
- Earliest claimed: 2010-11-19
- Assignees: Jx Nippon Oil & Energy Corporation
- Applicants: Kazuhiro Yagishita
- Inventors: Kazuhiro Yagishita
- Web page: https://patentgrep.com/patent/US9040470B2

## CPC

- C10M 137/10: Thio derivatives
- C10M 137/04: Phosphate esters
- C10M 141/10: at least one of them being an organic phosphorus-containing compound
- C10M 2205/0285: used as base material
- C10M 2219/068: Thiocarbamate metal salts
- C10M 2223/04: Phosphate esters
- C10M 2223/042: Metal salts thereof
- C10M 2223/045: Metal containing thio derivatives
- C10M 2227/09: Complexes with metals
- C10N 2010/12: Groups 6 or 16
- C10N 2030/06: Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
- C10N 2040/00: Specified use or application for which the lubricating composition is intended
- C10N 2040/02: Bearings
- C10N 2040/04: Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
- C10N 2040/042: {for automatic transmissions}
- C10N 2040/044: {for manual transmissions}
- C10N 2040/08: Hydraulic fluids, e.g. brake-fluids
- C10N 2040/12: Gas-turbines
- C10N 2040/30: Refrigerators lubricants {or compressors lubricants}
- C10N 2050/10: semi-solid; greasy
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## Abstract

Provided are a lubricant composition capable of reducing friction between sliding parts at least one of which contains an aluminum-based material in a lubrication section, and a method for lubricating an aluminum-based member with the composition. The lubricant composition is for use in a lubrication section having sliding parts at least one of which contains an aluminum-based material, and contains a lubricant base oil and at least one of a phosphorus-containing carboxylic compound and a metal salt thereof (component (A)) at 0.001 to 1 mass % of the composition in terms of phosphorus. The composition may suitably be used as lubricant such as drive train lubricant for automatic or manual transmissions, grease, wet brake oil, hydraulic actuation oil, turbine oil, compressor oil, bearing oil, refrigerant oil, and the like used in apparatus having the sliding parts.

## Claims

### Claim 1

A method for lubricating an aluminum-based member comprising lubricating a lubrication section having sliding parts at least one of which contains an aluminum-based material and has aluminum present on a surface thereof, with a lubricant composition, said lubricant composition comprising:
a lubricant base oil,
at least one of a phosphorus-containing carboxylic compound of formula (1) and a metal salt thereof (component (A)) at 0.005 to 0.1 mass % of the composition in terms of phosphorus:
wherein X1 to X4 each independently stands for an oxygen or sulfur atom, R4 and R5 each independently stands for a hydrocarbon group having 1 to 30 carbon atoms, and R6 to R9 each independently stands for a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms,
molybdenum dithiocarbamate (component (B)) at 400 to 1500 mass ppm of the composition in terms of molybdenum, and
a zinc dialkyl phosphate compound (component (C)) at 0.02 to 0.08 mass % of the composition in terms of phosphorus, wherein two alkyls of said zinc dialkyl phosphate compound each independently has 3 to 18 carbon atoms,
wherein the total content of components (A) and (C) is not more than 0.15 mass % in terms of phosphorus element.

### Claim 2 (depends on 1)

The method for lubricating an aluminum-based member according to claim 1,
wherein said component (A) is β-dithiophosphoropropionic acid at 0.02 to 0.1 mass % of the composition in terms of phosphorus.