Rubber composition for tires, method for preparing rubber composition for tires, and tire

Patent metadata

Field	Value
Publication number	US-11225532-B2
Application number	US-201815950808-A
Country	US
Kind code	B2
Filing date	Apr 11, 2018
Priority date	Apr 25, 2017
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

Provided are a rubber composition for tires having low tan δ at approximately 60° C. and excellent breaking energy at approximately 25° C.; a method for preparing the rubber composition for tires; and a tire thereof. The present invention relates to a rubber composition for tires which contains a rubber component including an isoprene-based rubber, and which has a correlation length Ξb of 50 nm or less as determined by fitting the following Equations 1 to 6 to a scattering intensity curve I(q) obtained by X-ray scattering analysis or neutron scattering analysis:I(q)=A1+q2⁢ξ2+B(1+q2⁢Ξb2)2+C(1+q2⁢Ξc2)2(Equation⁢⁢1)ξ<Ξb<Ξc(Equation⁢⁢2)A=8⁢π⁢⁢Na⁢σ2⁢ξ3(Equation⁢⁢3)B=4⁢π⁢⁢Nb⁢σ2⁢Ξb2(Equation⁢⁢4)C=4⁢π⁢⁢Nc⁢σ2⁢Ξc2(Equation⁢⁢5)q=4⁢π⁢⁢sin⁢θ2λ(Equation⁢⁢6)A, B, C, ξ, Ξb, Ξc: fitting parameterq: scattering vectorNa: number per unit volume (number/cm3) of scatterers having a correlation length ξNb: number per unit volume (number/cm3) of scatterers having a correlation length ΞbNc: number per unit volume (number/cm3) of scatterers having a correlation length Ξcσ: electron density difference (electron·(cm−3)) between scatterers and the surrounding matrix or scattering length density difference (cm−2) between scatterers and the surrounding solventθ: scattering angleλ: wavelength of X rays or neutrons.

First claim

The invention claimed is:

1. A tire, formed from a rubber composition for tires,
the rubber composition for tires comprising a rubber component including an isoprene-based rubber,
the rubber composition for tires being formed by a method that includes kneading at a temperature of 160° C. to 196° C. the isoprene-based rubber, sulfur and a basic agent that, either itself or after decomposition with hydrogen sulfide, has a pKa in water at 25° C. of over 8.0 in order to obtain a correlation length Ξ b of 50 nm or less as determined by fitting the following Equations 1 to 6 to a scattering intensity curve I(q) obtained by X-ray scattering analysis or neutron scattering analysis:

I

(
q
)

=

A

1
+

q
2

⁢

ξ
2

+

B

(

1
+

q
2

⁢

Ξ
b
2

)

2

+

C

(

1
+

q
2

⁢

Ξ
c
2

)

2

(

Equation
⁢

⁢
1

)

ξ
<

Ξ
b

<

Ξ
c

(

Equation
⁢

⁢
2

)

A
=

8
⁢
π
⁢

⁢

N
a

⁢

σ
2

⁢

ξ
3

(

Equation
⁢

⁢
3

)

B
=

4
⁢
π
⁢

⁢

N
b

⁢

σ
2

⁢

Ξ
b
2

(

Equation
⁢

⁢
4

)

C
=

4
⁢
π
⁢

⁢

N
c

⁢

σ
2

⁢

Ξ
c
2

(

Equation
⁢

⁢
5

)

q
=

Assignees

• Sumitomo Rubber Ind

Inventors

• Matsumoto Norihiro

Classifications

• C08L9/00 Primary

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

• G01N23/185

  in tyres · CPC title

• G01N23/201

  by measuring small-angle scattering · CPC title

• C08K5/47

  Thiazoles · CPC title

• C08K5/31

  Guanidine; Derivatives thereof · CPC title