# US 2014/0155307 A1 · Biodegradable lubricating oil composition

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- Number: US 2014/0155307 A1
- Document ID: US20140155307A1
- Status: Published application
- Kind: A1
- Application number: 14/176,432
- Filed: 2014-02-10
- Published: 2014-06-05
- Earliest claimed: 2004-01-30
- Assignees: Idemitsu Kosan Co., Ltd.
- Applicants: Idemitsu Kosan Co., Ltd.
- Inventors: Hiroshi KAWASAKI
- Web page: https://patentgrep.com/patent/US20140155307A1

## CPC

- C10M 135/10: Sulfonic acids or derivatives thereof
- C10M 129/10: having hydroxy groups bound to a carbon atom of a six-membered aromatic ring
- C10M 133/44: Five-membered ring containing nitrogen and carbon only
- C10M 169/04: Mixtures of base-materials and additives
- C10M 2207/0225: used as base material
- C10M 2207/026: with tertiary alkyl groups
- C10M 2207/2835: used as base material
- C10M 2207/289: containing free hydroxy groups
- C10M 2207/2895: used as base material
- C10M 2215/223: Five-membered rings containing nitrogen and carbon only
- C10M 2219/044: Sulfonic acids, Derivatives thereof, e.g. neutral salts
- C10M 2219/046: Overbased sulfonic acid salts
- C10N 2010/04: Groups 2 or 12
- C10N 2020/081: {Biodegradable compounds}
- C10N 2030/02: Pour-point; Viscosity index
- C10N 2030/06: Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
- C10N 2030/08: Resistance to extreme temperature
- C10N 2030/10: Inhibition of oxidation, e.g. anti-oxidants
- C10N 2030/12: Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
- C10N 2030/64: {Environmental friendly compositions}
- 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 2040/20: Metal working
- C10N 2040/22: with essential removal of material {, e.g. cutting, grinding or drilling}
- C10N 2040/25: Internal-combustion engines
- 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

[PROBLEMS] To provide a biodegradable lubricating oil composition which has excellent biodegradability, a high viscosity index, a low pour point, a high flash point, being satisfactory with lubricity, oxidative stability, property of preventing the corrosion of iron and non-ferrous metals, and suitability for use with sealing materials. [MEANS FOR SOLVING THE PROBLEMS] A biodegradable lubricating oil composition comprising (A) a synthetic ester base oil comprising at least 50 mass % hindered ester of an aliphatic monocarboxylic acid with an aliphatic hindered polyol which has one or more quaternary carbon atoms per molecule and in which at least one of the quaternary carbon atoms has one to four methylol groups bonded thereto and (B) ingredients which are (a) 0.1 to 5.0 mass % phenolic antioxidant, (b) 0.01 to 2.0 mass % calcium sulfonate having a low base number, and (c) 0.01 to 1.0 mass % triazole compound, and has the degree of biodegradation of 60% or higher when examined by the test for the degree of microbial degradation of chemical substances according to the OECD Test Guideline 301C method.

## Claims

### Claim at position 1

1-8. (canceled)

### Claim 9

A hydraulic fluid or a metal-working oil comprising a composition which comprises
(A) a synthetic ester base oil comprising at least 50 mass % hindered ester of an aliphatic monocarboxylic acid with an aliphatic hindered polyol which has one or more quaternary carbon atoms per molecule and in which at least one of the quaternary carbon atoms has one to four methylol groups bonded thereto, and
(B) ingredients which are (a) 0.1 to 5.0 mass % phenolic antioxidant, (b) 0.01 to 2.0 mass % calcium sulfonate having a base number in the range from 0 to 50 mg KOH/g, and (c) 0.01 to 1.0 mass % triazole compound,
wherein said composition has a degree of biodegradation of 60% or higher when examined by the test for the degree of microbial degradation of chemical substances according to the OECD Test Guideline 301C method,
wherein said composition has a pour point of −40° C. or less, and
wherein the hydraulic fluid or the metal-working oil optionally further comprises one or more selected from the group consisting of an extreme-pressure agent, an antiwear agent, a viscosity index improver, a pour point depressant, an ash-free dispersant, a surfactant, an anti-foaming agent, and a demulsifier.

### Claim 10 (depends on 9)

The hydraulic fluid or metal-working oil according to claim 9, wherein the aliphatic hindered polyol is a compound of formula (I):
wherein R1 and R2 represent independently a hydrocarbon group having 1 to 6 carbon atoms or a methylol group, and n is an integer of 0 to 4.

### Claim 11 (depends on 10)

The hydraulic fluid or metal-working oil according to claim 10, wherein the aliphatic hindered polyol is trimethylolpropane, neopentyl glycol, pentaerythritol, or a dehydrated condensate thereof.

### Claim 12 (depends on 9)

The hydraulic fluid or metal-working oil according to claim 9, wherein the aliphatic monocarboxylic acid is a saturated or unsaturated monocarboxylic acid having 6 to 22 carbon atoms.

### Claim 13 (depends on 9)

A method for making the hydraulic fluid or metal-working oil according to claim 9, comprising admixing:
the synthetic ester base oil (A),
the ingredients (B),
a hydraulic fluid or a metal-working oil, and
optionally, one or more selected from the group consisting of an extreme-pressure agent, an antiwear agent, a viscosity index improver, a pour point depressant, an ash-free dispersant, a surfactant, an anti-foaming agent, and a demulsifier.