Rubber composition and pneumatic tire

Patent metadata

Field	Value
Publication number	US-10112441-B2
Application number	US-201615211460-A
Country	US
Kind code	B2
Filing date	Jul 15, 2016
Priority date	Jul 23, 2015
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A rubber composition comprises a diene rubber, a hydrocarbon type wax, cashew oil and a processing aid. The rubber composition can suppress whitening of a rubber surface and additionally can give black and luster to the rubber surface. The processing aid comprises at least one selected from the group consisting of a fatty acid metal salt, a fatty acid amide, a fatty acid ester and a fatty acid ester amide, wherein the proportion of constituent fatty acids having from 18 to 20 carbon atoms is from 20 to 60 mass %. A pneumatic tire has a rubber part (for example, a tread rubber, a side wall rubber or a rim strip) comprising the rubber composition.

First claim

What is claimed is:

1. A rubber composition comprising:
a diene rubber,
a hydrocarbon wax,
cashew oil, and
a processing aid comprising at least one selected from the group consisting of a fatty acid metal salt, a fatty acid amide, a fatty acid ester and a fatty acid ester amide, wherein the processing aid has a proportion of constituent fatty acid having from 18 to 20 carbon atoms of from 20 to 60 mass %.

2. The rubber composition according to claim 1 , wherein the cashew oil is such that a proportion of cardol in monomers is from 10 to 30 mass %, and the proportion of cardanol in monomers is from 70 to 90 mass %.

3. The rubber composition according to claim 1 , wherein an amount of the cashew oil is from 1 to 40 parts by mass per 100 parts by mass of the diene rubber, and the amount of the processing aid is from 1 to 10 parts by mass per 100 parts by mass of the diene rubber.

4. The rubber composition according to claim 1 , wherein the hydrocarbon wax is at least one selected from the group consisting of petroleum wax, paraffin synthetic wax and polyolefin wax.

5. The rubber composition according to claim 1 , wherein the cashew oil is at least one selected from the group consisting of a decarboxylated cashew nut shell liquid, a cashew monomer and a cashew polymer.

6. The rubber composition according to claim 1 , wherein the processing aid is a mixture of; (D1) a fatty acid metal salt; and (D2) at least one selected from the group consisting of the fatty acid amide, the fatty acid ester and the fatty acid ester amide.

7. A pneumatic tire comprising a rubber part containing the rubber composition according to claim 1 .

8. The pneumatic tire according to claim 7 , wherein the rubber part is at least one selected from the group consisting of a tread rubber, a side wall rubber and a rim strip.

Assignees

• Toyo Tire & Rubber Co

Inventors

• Kamada Shinsaku

Classifications

• B60C2001/005

  Compositions of the bead portions, e.g. clinch or chafer rubber or cushion rubber · CPC title

• B60C1/0016

  Compositions of the tread · CPC title

• B60C1/0025 Primary

  Compositions of the sidewalls · CPC title

• C08L9/06 Primary

  Copolymers with styrene · CPC title

• B60C15/0628

  comprising a bead reinforcing layer · CPC title