# US 11,993,716 B2 · Rubber composition and tire

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- Number: US 11,993,716 B2
- Document ID: US11993716B2
- Status: Granted
- Kind: B2
- Application number: 17/851,763
- Filed: 2022-06-28
- Published: 2023-02-09
- Granted: 2024-05-28
- Earliest claimed: 2021-07-26
- Assignees: Sumitomo Rubber Industries, Ltd.
- Applicants: Sumitomo Rubber Industries, Ltd.
- Inventors: Ryo Yajima
- Web page: https://patentgrep.com/patent/US11993716B2

## CPC

- B60C 1/00: Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- C08L 91/00: Compositions of oils, fats or waxes; Compositions of derivatives thereof
- B60C 1/0008: {Compositions of the inner liner}
- B60C 1/0016: {Compositions of the tread}
- B60C 1/0025: {Compositions of the sidewalls}
- C08L 7/00: Compositions of natural rubber
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Provided are a rubber composition having excellent overall performance in terms of fuel economy and bleed resistance as well as good LCA performance (e.g., reduction of CO2 emissions), and a tire including the composition. A rubber composition containing a plant oil satisfying the conditions (1)-(4): (1) it is liquid at 23° C.; (2) it has a GPC weight-average molecular weight of more than 800; (3) when it is 3-fold diluted with THF, it satisfies the following relationship with respect to the absorbances at 450 nm and 600 nm measured with a spectrophotometer: Absorbance at 450 nm−Absorbance at 600 nm≥0.05; and (4) it satisfies the following relationship with respect to the weights before and after passing 100 g of the plant oil at 23-30° C. through 20 mesh plain weave wire cloth: (Weight after passing through plain weave wire cloth)/(Weight before passing through plain weave wire cloth)×100≥99.0.

## Claims

### Claim 1

A tire, comprising a rubber composition comprising at least one plant oil, the plant oil satisfying the following conditions (1) to (4):
(1) the plant oil is liquid at a temperature of 23° C.;
(2) the plant oil has a GPC weight average molecular weight of more than 800;
(3) when the plant oil is 3-fold diluted with THF, the diluted plant oil satisfies the following relationship with respect to absorbances at wavelengths of 450 nm and 600 nm measured with a spectrophotometer:
Absorbance at wavelength of 450 nm−Absorbance at wavelength of 600 nm≥0.05; and
(4) the plant oil satisfies the following relationship with respect to weight in grams before and after passing 100 g of the plant oil at a temperature of 23 to 30° C. through 20 mesh plain weave wire cloth:
(Weight after passing through plain weave wire cloth)/(Weight before passing through plain weave wire cloth)×100≥99.0.

### Claim 2 (depends on 1)

The tire according to claim 1, wherein the plant oil has a GPC molecular weight distribution curve in which a peak area corresponding to a molecular weight of 800 or more is 95% or greater.

### Claim 3 (depends on 1)

The tire according to claim 1, wherein the plant oil is at least one waste edible oil.

### Claim 4 (depends on 1)

The tire according to claim 1, wherein the plant oil is present in an amount of 1 to 100 parts by mass per 100 parts by mass of a rubber component content in the rubber composition.

### Claim 5 (depends on 1)

The tire according to claim 1, wherein the rubber composition is at least one of a sidewall rubber composition or an innerliner rubber composition.