Rubber composition and pneumatic tire using the same

Patent metadata

Field	Value
Publication number	US-11530319-B2
Application number	US-202017095932-A
Country	US
Kind code	B2
Filing date	Nov 12, 2020
Priority date	Dec 2, 2019
Publication date	Dec 20, 2022
Grant date	Dec 20, 2022

Abstract

There is provided a rubber composition which can provide a tire having an excellent balance of the breaking properties, the rolling resistance performance (low fuel consumption) and the wet grip performance. The rubber composition includes 100 parts by mass of a diene rubber, and 1 to 100 parts by mass of fine particles (A) having a glass transition point of −70° C. to 0° C. and composed of a polymer comprising constituent units of at least one monofunctional monomer. The fine particles (A) have a crosslinked structure crosslinked by at least one polyfunctional monomer having a polysulfide bond in which at least two successive sulfur atoms are bonded together.

First claim

What is claimed is:

1. A rubber composition comprising 100 parts by mass of a diene rubber, and 1 to 100 parts by mass of fine particles (A) having a glass transition point of −70° C. to 0° C. and composed of a polymer comprising constituent units of at least one monofunctional monomer, wherein the fine particles (A) have a crosslinked structure crosslinked by at least one polyfunctional monomer having a polysulfide bond in which at least two successive sulfur atoms are bonded together.

2. The rubber composition according to claim 1 , wherein the average particle size of the fine particles (A) is 10 nm to 100 nm.

3. The rubber composition according to claim 1 , wherein the polysulfide bond is a disulfide bond.

4. The rubber composition according to claim 2 , wherein the polysulfide bond is a disulfide bond.

5. The rubber composition according to claim 1 , wherein the fine particles (A) are composed of a polymer comprising an alkyl (meth)acrylate unit, represented by the following formula (1), as a constituent unit:

wherein R 1 is a hydrogen atom or a methyl group, and R 1 s in the same molecule may be the same or different from each other; and R 2 is an alkyl group having 4 to 18 carbon atoms, and R 2 s in the same molecule may be the same or different from each other.

6. The rubber composition according to claim 2 , wherein the fine particles (A) are composed of a polymer comprising an alkyl (meth)acrylate unit, represented by the following formula (1), as a constituent unit:

wherein R 1 is a hydrogen atom or a methyl group, and R 1 s in the same molecule may be the same or different from each other; and R 2 is an alkyl group having 4 to 18 carbon atoms, and R 2 s in the same molecule may be the same or different from each other.

7. The rubber composition according to claim 3 , wherein the fine particles (A) are composed of a polymer comprising an alkyl (meth)acrylate unit, represented by the following formula (1), as a constituent unit:

wherein R is a hydrogen atom or a methyl group, and R 1 s in the same molecule may be the same or different from each other; and R 2 is an alkyl group having 4 to 18 carbon atoms, and R 2 s in the same molecule may be the same or different from each other.

8. The rubber composition according to claim 4 , wherein the fine particles (A) are composed of a polymer comprising an alkyl (meth)acrylate unit, represented by the following formula (1), as a constituent unit:

wherein R 1 is a hydrogen atom or a methyl group, and R 1 s in the same molecule may be the same or different from each other; and R 2 is an alkyl group having 4 to 18 carbon atoms, and R 2 s in the same molecule may be the same or different from each other.

9. A pneumatic tire produced using the rubber composition according to claim 1 .

10. A pneumatic tire produced using the rubber composition according to claim 2 .

11. A pneumatic tire produced using the rubber composition according to claim 3 .

12. A pneumatic tire produced using the rubber composition according to claim 4 .

13. A pneumatic tire produced using the rubber composition according to claim 5 .

14. A pneumatic tire produced using the rubber composition according to claim 6 .

15. A pneumatic tire produced using the rubber composition according to claim 7 .

16. A pneumatic tire produced using the rubber composition according to claim 8 .

Assignees

• Toyo Tire Corp

Inventors

• Kimura Takuya

Classifications

• B60C1/00

  Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition · CPC title

• B60C2011/0025

  Modulus or tan delta · CPC title

• C08L7/00 Primary

  Compositions of natural rubber · CPC title

• B60C1/0016

  Compositions of the tread · CPC title

• B60C11/0008

  characterised by the tread rubber · CPC title