Rubber composition for tire, and pneumatic tire

Patent metadata

Field	Value
Publication number	US-2021023881-A1
Application number	US-201917043208-A
Country	US
Kind code	A1
Filing date	Mar 4, 2019
Priority date	Apr 2, 2018
Publication date	Jan 28, 2021
Grant date	—

Abstract

The present invention provides rubber compositions with good silica dispersion and fuel economy, and pneumatic tires including the rubber compositions. The present invention relates to a rubber composition for tires, containing: a rubber component including 30% by mass or more of a styrene-butadiene rubber having a SiOR group wherein R represents a hydrogen atom or a hydrocarbon group; a silica having a nitrogen adsorption specific surface area of 210 m2/g or more in an amount of 50 parts by mass or more per 100 parts by mass of the rubber component; and at least one surfactant selected from the group consisting of polyoxyalkylene alkenyl ether sulfate salts and polyoxyalkylene alkyl ether sulfate salts.

First claim

1 . A rubber composition for tires, comprising:
a rubber component comprising 30% by mass or more of a styrene-butadiene rubber having a SiOR group wherein R represents a hydrogen atom or a hydrocarbon group; a silica having a nitrogen adsorption specific surface area of 210 m 2 /g or more in an amount of 50 parts by mass or more per 100 parts by mass of the rubber component; and at least one surfactant selected from the group consisting of polyoxyalkylene alkenyl ether sulfate salts and polyoxyalkylene alkyl ether sulfate salts.

2 . The rubber composition for tires according to claim 1 , wherein a ratio X/Y of an amount X (parts by mass) of the surfactant to an amount Y (parts by mass) of a silane coupling agent is 0.05 to 20.

3 . The rubber composition for tires according to claim 1 , wherein a ratio Z/(X+Y) of an amount Z (parts by mass) of the silica to an amount X (parts by mass) of the surfactant and an amount Y (parts by mass) of a silane coupling agent is 3 to 30.

4 . The rubber composition for tires according to claim 1 , wherein the surfactant is a polyoxyalkylene alkenyl ether sulfate salt.

5 . A pneumatic tire, comprising a tire component formed from the rubber composition according to claim 1 .

6 . A rubber composition for tires, comprising:
a rubber component comprising 30% by mass or more of a styrene-butadiene rubber having a SiOR group wherein R represents a hydrogen atom or a hydrocarbon group, and having a total styrene-butadiene rubber content of 70 to 90% by mass and a polybutadiene rubber content of 10 to 30% by mass, each based on 100% by mass of the rubber component; a silica having a nitrogen adsorption specific surface area of 210 m 2 /g or more in an amount of 50 parts by mass or more per 100 parts by mass of the rubber component; and at least one surfactant selected from the group consisting of polyoxyalkylene alkenyl ether sulfate salts and polyoxyalkylene alkyl ether sulfate salts.

7 . The rubber composition for tires according to claim 6 , wherein a ratio X/Y of an amount X (parts by mass) of the surfactant to an amount Y (parts by mass) of a silane coupling agent is 0.05 to 20.

8 . The rubber composition for tires according to claim 6 , wherein a ratio Z/(X+Y) of an amount Z (parts by mass) of the silica to an amount X (parts by mass) of the surfactant and an amount Y (parts by mass) of a silane coupling agent is 3 to 30.

9 . The rubber composition for tires according to claim 6 , wherein the surfactant is a polyoxyalkylene alkenyl ether sulfate salt.

10 . A pneumatic tire, comprising a tire component formed from the rubber composition according to claim 6 .

11 - 20 . (canceled)

21 . A rubber composition for tires, comprising:
a rubber component comprising 30% by mass or more of a styrene-butadiene rubber having a SiOR group wherein R represents a hydrogen atom or a hydrocarbon group; a silica having a nitrogen adsorption specific surface area of 210 m 2 /g or more in an amount of 50 parts by mass or more per 100 parts by mass of the rubber component; a carbon black in an amount of 2 parts by mass or more per 100 parts by mass of the rubber component; and at least one surfactant selected from the group consisting of polyoxyalkylene alkenyl ether sulfate salts and polyoxyalkylene alkyl ether sulfate salts.

22 . The rubber composition for tires according to claim 21 , wherein a ratio X/Y of an amount X (parts by mass) of the surfactant to an amount Y (parts by mass) of a silane coupling agent is 0.05 to 20.

23 . The rubber composition for tires according to claim 21 , wherein a ratio Z/(X+Y) of an amount Z (parts by mass) of the silica to an amount X (parts by mass) of the surfactant and an amount Y (parts by mass) of a silane coupling agent is 3 to 30.

24 . The rubber composition for tires according to claim 21 , wherein a ratio A/Z of an amount A (parts by mass) of the carbon black to an amount Z (parts by mass) of the silica is 0.01 to 120.

25 . The rubber composition for tires according to claim 21 , wherein the surfactant is a polyoxyalkylene alkenyl ether sulfate salt.

26 . A pneumatic tire, comprising a tire component formed from the rubber composition according to claim 21 .

Assignees

• Sumitomo Rubber Ind

Inventors

• Kitaou Ayaka
• Tomisaki Yukari
• Miki Naoyuki
• Nakahata Shoko

Classifications

• C08L15/00

  Compositions of rubber derivatives (C08L11/00, C08L13/00 take precedence) · CPC title

• C08L9/06

  Copolymers with styrene · CPC title

• C08L9/00

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title

• C08K2201/006

  Additives being defined by their surface area · CPC title

• C08C19/42

  reacting with metals or metal-containing groups · CPC title