# US 11,299,605 B2 · Heavy duty pneumatic tire

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- Number: US 11,299,605 B2
- Document ID: US11299605B2
- Status: Granted
- Kind: B2
- Application number: 16/597,209
- Filed: 2019-10-09
- Published: 2020-04-30
- Granted: 2022-04-12
- Earliest claimed: 2018-10-24
- Assignees: Sumitomo Rubber Industries, Ltd.
- Applicants: Sumitomo Rubber Industries, Ltd.
- Inventors: Shingo Himeda
- Web page: https://patentgrep.com/patent/US11299605B2

## CPC

- C08L 9/06: Copolymers with styrene
- B60C 1/0016: {Compositions of the tread}
- B60C 11/0008: {characterised by the tread rubber}
- B60C 11/0306: {Patterns comprising block rows or discontinuous ribs}
- B60C 11/033: {by the void or net-to-gross ratios of the patterns}
- C08L 7/00: Compositions of natural rubber
- C08L 9/00: Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- B60C 2011/0016: {Physical properties or dimensions}
- B60C 2011/0372: {with particular inclination angles}
- B60C 2200/06: for heavy duty vehicles
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2205/03: containing three or more polymers in a blend
- Y02T 10/86: Optimisation of rolling resistance, e.g. weight reduction
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Provided is a heavy duty pneumatic tire having excellent abrasion resistance. The heavy duty pneumatic tire includes a tread portion including a rubber composition containing: an isoprene rubber; a butadiene rubber; a styrene-butadiene rubber; and a carbon black having an average particle size of 20 nm or less and/or a cetyltrimethylammonium bromide adsorption specific surface area of 130 m2/g or more, the tread portion having a land ratio of 81% or higher.

## Claims

### Claim 1

A heavy duty pneumatic tire, comprising a tread portion,
the tread portion comprising a rubber composition containing:
an isoprene rubber;
a butadiene rubber;
a styrene-butadiene rubber; and
a carbon black having at least one of
an average particle size of 20 nm or less or
a cetyltrimethylammonium bromide adsorption specific surface area of 130 m2/g or more,
entire tread portion having a land ratio of 81% or higher;
wherein the rubber composition has abrasion resistance index of 140 or higher.

### Claim 2 (depends on 1)

The heavy duty pneumatic tire according to claim 1, wherein the rubber composition further contains a carbon black having at least one of an average particle size of more than 20 nm but not more than 25 nm or a cetyltrimethylammonium bromide adsorption specific surface area of at least 100 m2/g but less than 130 m2/g.

### Claim 3 (depends on 1)

The heavy duty pneumatic tire according to claim 1, wherein the rubber composition has a total styrene content of 2.0 to 11.0% by mass based on 100% by mass of a rubber component in the rubber composition.

### Claim 4 (depends on 1)

The heavy duty pneumatic tire according to claim 1,
wherein the amount of the isoprene rubber based on 100% by mass of the rubber component in the rubber composition being 40% by mass or less.

### Claim 5 (depends on 1)

The heavy duty pneumatic tire according to claim 1,
wherein the rubber composition further contains a second carbon black having at least one of
an average particle size of more than 20 nm but not more than 25 nm or
a cetyltrimethylammonium bromide adsorption specific surface area of at least 100 m2/g but less than 130 m2/g.