# US 11,306,270 B2 · Lubricant composition, method for producing lubricant composition, and continuously variable transmission

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- Number: US 11,306,270 B2
- Document ID: US11306270B2
- Status: Granted
- Kind: B2
- Application number: 16/633,034
- Filed: 2019-01-28
- Published: 2020-07-02
- Granted: 2022-04-19
- Earliest claimed: 2018-01-29
- Assignees: Idemitsu Kosan Co., Ltd.
- Applicants: Idemitsu Kosan Co., Ltd.
- Inventors: Yoji Sunagawa; Takeshi Iwasaki
- Web page: https://patentgrep.com/patent/US11306270B2

## CPC

- C10M 105/04: aliphatic
- C10M 105/34: of monocarboxylic acids
- C10M 105/38: of polyhydroxy compounds
- C10M 111/02: at least one of them being a non-macromolecular organic compound
- C10M 169/04: Mixtures of base-materials and additives
- F16H 15/00: Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members (control of change-speed or reversing-gearings conveying rotary motion F16H59/00 - F16H63/00)
- C10M 2203/04: Well-defined cycloaliphatic compounds
- C10M 2203/045: used as base material
- C10M 2203/065: used as base material
- C10M 2207/2805: used as base material
- C10M 2207/2815: used as base material
- C10M 2207/2825: used as base material
- C10M 2207/283: of polyhydroxy compounds
- C10M 2207/2835: used as base material
- C10N 2020/071: {Branched chain compounds}
- C10N 2030/02: Pour-point; Viscosity index
- C10N 2030/06: Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
- C10N 2030/74: {Noack Volatility}
- C10N 2040/04: Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
- C10N 2040/045: {for continuous variable transmission [CVT]}
- 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)
- F16H: GEARING
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## Abstract

To provide a lubricating oil composition achieving both of high traction coefficient and excellent low temperature fluidity at a higher level and having a high flash point, which contains a naphthene-based synthetic oil (a) having a flash point of 140° C. or higher, and an ester (b) having 5 to 32 carbon atoms and having a branched chain, wherein the content of the naphthene-based synthetic oil (a) based on the total amount of the composition is 35% by mass or more and less than 80% by mass, a method for producing the lubricating oil composition, and a continuously variable transmission using the lubricating oil composition.

## Claims

### Claim 1

A lubricating oil composition comprising a naphthene-based synthetic oil (a) having a flash point of 140° C. or higher and an ester (b) having 5 to 32 carbon atoms and having a branched chain, wherein
the content of the naphthene-based synthetic oil (a) based on the total amount of the composition is 35% by mass or more and less than 75% by mass, and
wherein the naphthene-based synthetic oil (a) is a synthetic oil of formula (1):
Rp1111—X11—R12—X12—Rp1213 (1)
wherein R11 and R13 each independently represent a monovalent hydrocarbon group, R12 represents a divalent hydrocarbon group, X11 and X12 each independently represent a cyclohexane ring, a bicycloheptane ring, or a bicyclooctane ring, and p11 and p12 each independently represent an integer of 1 or more and 6 or less.

### Claim 2 (depends on 1)

The lubricating oil composition according to claim 1, wherein X11 and X12 are each independently a cyclohexane ring, a bicyclo[2.2.1]heptane ring, a bicyclo[3.3.0]heptane ring, a bicyclo[3.2.1]octane ring, or a bicyclo[2.2.2]octane ring.

### Claim 3 (depends on 1)

The lubricating oil composition according to claim 1, wherein R11 and R13 each independently represent an alkyl group or an alkenyl group, and R12 represents an alkylene group or an alkenylene group.

### Claim 4 (depends on 1)

The lubricating oil composition according to claim 1, wherein R11 and R13 each independently represent an alkyl group having 1 to 4 carbon atoms, R12 represents an alkylene group having 1 to 4 carbon atoms, and p11 and p12 each independently represent 1 or 2.

### Claim 5 (depends on 1)

The lubricating oil composition according to claim 1, wherein the ester (b) is at least one ester selected from a monoester represented by formula (2) and a diester represented by formula (3):
wherein R21 and R22 each independently represent a branched monovalent hydrocarbon group having 3 or more carbon atoms, and
R31 and R32 each independently represent a branched monovalent hydrocarbon group having 3 or more carbon atoms and X31 represents a branched divalent hydrocarbon group having 3 or more carbon atoms.

### Claim 6 (depends on 5)

The lubricating oil composition according to claim 5, wherein the ester (b) is of formula (2) and R11 and R22 each independently represent a branched alkyl group or alkenyl group having 3 to 16 carbon atoms.

### Claim 7 (depends on 5)

The lubricating oil composition according to claim 5, wherein the ester (b) is of formula (3), and R31 and R32 each independently represent a branched alkyl group or alkenyl group having 3 to 16 carbon atoms, and X31 represents a branched alkylene group or alkenylene group having 3 to 16 carbon atoms.

### Claim 8 (depends on 1)

The lubricating oil composition according to claim 1, wherein the content of the ester (b) based on the total amount of the composition is 10% by mass or more and 65% by mass or less.

### Claim 9 (depends on 1)

The lubricating oil composition according to claim 1, wherein the lubricating oil composition has a Brookfield viscosity at −40° C., measured in accordance with ASTM D2983-09, of 15,000 mPa·s or less.

### Claim 10 (depends on 1)

The lubricating oil composition according to claim 1, wherein the lubricating oil composition has a flash point as measured by Cleveland open-cup method in accordance with JIS K2265-4:2007, of 140° C. or higher.

### Claim 11 (depends on 1)

A transmission of a traction drive system, comprising the lubricating oil composition according to claim 1.

### Claim 12

A method for producing a lubricating oil composition, comprising:
blending a naphthene-based synthetic oil (a) having a flash point of 140° C. or higher and an ester (b) having 5 to 32 carbon atoms and having a branched chain, in such a manner that the content of the naphthene-based synthetic oil (a) based on the total amount of the composition is 35% by mass or more and less than 75% by mass;
wherein the naphthene-based synthetic oil (a) is a synthetic oil of formula (1):
Rp1111—X11—R12—X12—Rp1213 (1)
wherein R11 and R13 each independently represent a monovalent hydrocarbon group, R12 represents a divalent hydrocarbon group, X11 and X12 each independently represent a cyclohexane ring, a bicycloheptane ring, or a bicyclooctane ring, and p11 and p12 each independently represent an integer of 1 or more and 6 or less.

### Claim 13

A continuously variable transmission comprising a lubricating oil composition containing a naphthene-based synthetic oil (a) having a flash point of 140° C. or higher and an ester (b) having 5 to 32 carbon atoms and having a branched chain, wherein the content of the naphthene-based synthetic oil (a) based on the total amount of the composition is 35% by mass or more and less than 75% by mass;
wherein the naphthene-based synthetic oil (a) is a synthetic oil of formula (1):
Rp1111—X11—R12—X12—Rp1213 (1)
wherein R11 and R13 each independently represent a monovalent hydrocarbon group, represents a divalent hydrocarbon group, X11 and X12 each independently represent a cyclohexane ring, a bicycloheptane ring, or a bicyclooctane ring, and p11 and p12 each independently represent an integer of 1 or more and 6 or less.