# US 10,309,487 B2 · Friction transmission belt

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- Number: US 10,309,487 B2
- Document ID: US10309487B2
- Status: Granted
- Kind: B2
- Application number: 16/117,879
- Filed: 2018-08-30
- Published: 2018-12-27
- Granted: 2019-06-04
- Earliest claimed: 2016-03-28
- Assignees: Bando Chemical Industries, Ltd.
- Applicants: Bando Chemical Industries, Ltd.
- Inventors: Takayuki Okubo; Shinji Takahashi; Hideaki Kawahara
- Web page: https://patentgrep.com/patent/US10309487B2

## CPC

- C08K 3/04: Carbon
- F16G 1/28: with a contact surface of special shape, e.g. toothed
- C08K 3/00: Use of inorganic substances as compounding ingredients
- C08K 3/36: Silica
- C08L 21/00: Compositions of unspecified rubbers
- C08L 23/00: Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L 23/06: Polyethylene
- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- C08L 101/12: characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity (liquid crystal materials or compositions C09K19/00)
- F16G 1/00: Driving-belts (V-belts F16G5/00; conveyor belt B65G)
- F16G 1/08: with reinforcement bonded by the rubber
- F16G 1/10: with textile reinforcement
- F16G 5/00: V-belts, i.e. belts of tapered cross-section
- F16G 5/06: with reinforcement bonded by the rubber
- F16G 5/08: with textile reinforcement
- F16G 5/20: with a contact surface of special shape, e.g. toothed
- 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
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

In a friction transmission belt including a rubber layer forming a pulley contact surface, the rubber layer includes a rubber composition containing polyolefin particles and an inorganic filler. In the rubber composition, a total content of the polyolefin particles and the inorganic filler with respect to 100 parts by mass of a rubber component is 85 parts by mass or more.

## Claims

### Claim 1

A friction transmission belt comprising a rubber layer forming a pulley contact surface, wherein
the rubber layer includes a rubber composition containing polyolefin particles, and an inorganic filler,
the inorganic filler includes at least silica not receiving coupling treatment,
in the rubber composition, a content of the polyolefin particles with respect to 100 parts by mass of a rubber component is 50 parts by mass or more and 100 parts by mass or less,
in the rubber composition, a content of the inorganic filler with respect to 100 parts by mass of a rubber component is 35 parts by mass or more and 85 parts by mass or less, and
an aspect ratio obtained by dividing maximum outer diameters of the polyolefin particles by minimum outer diameters the polyolefin particles is 2.00 or smaller.

### Claim 2 (depends on 1)

The friction transmission belt of claim 1, wherein in the rubber composition, the total content of the polyolefin particles and the inorganic filler with respect to 100 parts by mass of the rubber component is 95 parts by mass or more and 185 parts by mass or less.

### Claim 3 (depends on 1)

The friction transmission belt of claim 1, wherein in the rubber composition, the total content of the polyolefin particles and the inorganic filler with respect to 100 parts by mass of the rubber component is 105 parts by mass or more and 185 parts by mass or less.

### Claim 4 (depends on 1)

The friction transmission belt of claim 1, wherein
the polyolefin particles are ultrahigh molecular weight polyethylene having a molecular weight of 500,000 or more.

### Claim 5 (depends on 1)

The friction transmission belt of claim 1, wherein
the inorganic filler further includes at least one of, montmorillonite, clay, and calcium carbonate.

### Claim 6 (depends on 1)

The friction transmission belt of claim 1, wherein in the rubber composition, a content of the silica with respect to 100 parts by mass of the rubber component is 30 parts by mass or more and 85 parts by mass or less.

### Claim 7 (depends on 1)

The friction transmission belt of claim 1, wherein
the rubber composition does not contain a coupling agent.

### Claim 8 (depends on 6)

The friction transmission belt of claim 6, wherein
the inorganic filler includes at least Ca-montmorillonite.

### Claim 9 (depends on 2)

The friction transmission belt of claim 2, wherein
the polyolefin particles are ultrahigh molecular weight polyethylene having a molecular weight of 500,000 or more.

### Claim 10 (depends on 3)

The friction transmission belt of claim 3, wherein
the polyolefin particles are ultrahigh molecular weight polyethylene having a molecular weight of 500,000 or more.