# US 11,441,020 B2 · Transmission belt

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- Number: US 11,441,020 B2
- Document ID: US11441020B2
- Status: Granted
- Kind: B2
- Application number: 17/543,477
- Filed: 2021-12-06
- Published: 2022-03-24
- Granted: 2022-09-13
- Earliest claimed: 2019-06-07
- Assignees: Bando Chemical Industries, Ltd.
- Applicants: Bando Chemical Industries, Ltd.
- Inventors: Shogo Kobayashi
- Web page: https://patentgrep.com/patent/US11441020B2

## CPC

- C08L 9/00: Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08K 3/013: Fillers, pigments or reinforcing additives
- C08K 3/04: Carbon
- C08K 3/36: Silica
- C08K 7/02: Fibres or whiskers
- C08L 1/00: Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L 11/00: Compositions of homopolymers or copolymers of chloroprene
- C08L 21/00: Compositions of unspecified rubbers
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- F16G 1/08: with reinforcement bonded by the rubber
- F16G 1/28: with a contact surface of special shape, e.g. toothed
- F16G 5/06: with reinforcement bonded by the rubber
- B60C 2001/0066: {Compositions of the belt layers}
- C08L 2205/16: Fibres; Fibrils
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- F16G: BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES

## Abstract

A power transmission belt includes a pulley non-contacting portion made of a rubber composition. The rubber composition contains a rubber component, cellulose-based fine fibers, and a non-carbon black hydrophilic inorganic filler, and contains no carbon black or contains carbon black in an amount of less than 20 parts by mass relative to 100 parts by mass of the rubber component.

## Claims

### Claim 1

A power transmission belt comprising:
a pulley non-contacting portion made of a rubber composition,
the rubber composition containing a rubber component, cellulose-based fine fibers dispersed in the rubber component and having an average fiber diameter of 10 nm or more to 1000 nm or less, and a non-carbon black hydrophilic inorganic filler and containing no carbon black or containing carbon black in an amount of less than 20 parts by mass relative to 100 parts by mass of the rubber component, the rubber component made predominantly of chloroprene rubber, sulfur-modified chloroprene rubber, ethylene-α-olefin elastomer, chlorosulfonated polyethylene rubber, hydrogenated acrylonitrile rubber, or combinations thereof.

### Claim 2 (depends on 1)

The power transmission belt of claim 1, wherein
the cellulose-based fine fibers include cellulose-based fine fibers formed by mechanically-defibrating means.

### Claim 3 (depends on 1)

The power transmission belt of claim 1, wherein
a content of the cellulose-based fine fibers in the rubber composition is 1 part by mass or more to 20 parts by mass or less relative to 100 parts by mass of the rubber component.

### Claim 4 (depends on 1)

The power transmission belt of claim 1, wherein
the hydrophilic inorganic filler includes silica.

### Claim 5 (depends on 1)

The power transmission belt of claim 1, wherein
a content of the hydrophilic inorganic filler in the rubber composition is 3 parts by mass or more to 50 parts by mass or less relative to 100 parts by mass of the rubber component.

### Claim 6 (depends on 1)

The power transmission belt of claim 1, wherein
a ratio of the content of the hydrophilic inorganic filler to the content of the cellulose-based fine fibers in the rubber composition is 1.0 or more to 15 or less.

### Claim 7 (depends on 1)

The power transmission belt of claim 1, wherein
the content of the hydrophilic inorganic filler in the rubber composition is greater than the content of the cellulose-based fine fibers.

### Claim 8 (depends on 1)

The power transmission belt of claim 1, wherein
the rubber composition contains carbon black, and the carbon black includes FEF.

### Claim 9 (depends on 8)

The power transmission belt of claim 8, wherein
a sum of the content of the hydrophilic inorganic filler and the content of the carbon black in the rubber composition is 20 parts by mass or more to 40 parts by mass or less relative to 100 parts by mass of the rubber component.