US 2026/0159674 A1Published application

Tire

AssigneeBridgestone Corporation

InventorsMasahiro KAWASHIMA, Ryota TAKAHASHI

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Abstract

Provided is a tire (1) including a tread rubber layer (8) and belt layers (6A, 6B) located inward of the tread rubber layer (8) in the tire radial direction. The tread rubber layer (8) includes a rubber component, a resin component, and a filler. The rubber component includes an isoprene skeleton rubber and a styrene-butadiene rubber having a glass transition temperature of less than −40° C. The resin component has a difference of the SP value relative to that of the isoprene skeleton rubber of 1.40 (cal/cm3)1/2 or less. The tread rubber layer (8) satisfies the formula: mass ratio of the resin component/isoprene skeleton rubber ≥0.5. The belt layers (6A, 6B) include cords formed by twisting filaments satisfying, when the diameter of the filaments is X (mm) and the tensile strength of the filaments is Y (MPa), 4000−2000X≤Y≤4500−2000X.

Claims20

Dependent claims

A tire comprising a tread rubber layer located at an outermost surface of a tread portion, and a belt layer located inward of the tread rubber layer in a tire radial direction,

wherein the tread rubber layer comprises a rubber component, a resin component, and a filler,
the rubber component comprises an isoprene skeleton rubber and a styrene-butadiene rubber,
a glass transition temperature of at least one type of the styrene-butadiene rubber is lower than −40° C.,
the resin component has a difference of an SP value relative to an SP value of the isoprene skeleton rubber of 1.40 (cal/cm3)1/2 or less,
the tread rubber layer satisfies the following formula (A):
the
⁢
mass
⁢
ratio
⁢
of
⁢
the
⁢
resin
⁢
component
/
the
⁢
isoprene
⁢
skeleton
⁢
rubber
≥
0.5
,
(
A
)
the belt layer comprises a cord having a structure formed by twisting filaments, and
the filaments forming the cord of the belt layer, when a diameter of the filaments is X (mm) and a tensile strength of the filaments is Y (MPa), satisfy the following formula (B):
4
⁢
0
⁢
0
⁢
0
-
2
⁢
0
⁢
0
⁢
0
⁢
X
≤
Y
≤
4
⁢
5
⁢
0
⁢
0
-
2
⁢
0
⁢
0
⁢
0
⁢
X
.
(
B
)

72 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/126,783Filed 22 Nov 2023
Priority: JP 2022-18875225 Nov 2022
Published: 11 Jun 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

C08C 19/22
Chemical modification of rubber: incorporating nitrogen atoms into the molecule
C08L 15/00
Compositions of rubber derivatives
B60C 1/0016
Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition: compositions of the tread
B60C 9/0007
Reinforcements or ply arrangement of pneumatic tyres: reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal