Pneumatic tire

Patent metadata

Field	Value
Publication number	US-9718311-B2
Application number	US-201214123288-A
Country	US
Kind code	B2
Filing date	May 28, 2012
Priority date	May 31, 2011
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A pneumatic tire includes: an inner liner having a thermoplastic resin film, a carcass, and an adhesive layer disposed between the inner liner and the carcass, in which the dynamic storage modulus E's at −20° C. of the thermoplastic resin film, the adhesive layer, and the carcass are defined as E 1 ′, E 2 ′, and E 3 ′, respectively, and the relationship among E 1 ′, E 2 ′, and E 3 ′ satisfies E 1 ′>E 2 ′>E 3 ′. This pneumatic tire has excellent anti-crack property in a low-temperature environment of the inner liner.

First claim

The invention claimed is:

1. A pneumatic tire comprising:
an inner liner having a thermoplastic resin film, a carcass, and an adhesive layer disposed between the inner liner and the carcass, wherein
the dynamic storage modulus E's at −20° C. of the thermoplastic resin film, the adhesive layer, and the carcass are defined as E 1 ′, E 2 ′, and E 3 ′, respectively, and the relationship among E 1 ′, E 2 ′, and E 3 ′ satisfies E 1 ′>E 2 ′>E 3 ′,
the adhesive layer contains a modified diene polymer with a glass transition temperature of 0° C. or less,
the adhesive layer contains two or more kinds of modified diene polymers with different epoxidation rates,
the two or more kinds of modified diene polymers with different epoxidation rates comprises a low epoxidation rate modified diene polymer with an epoxidation rate of 5 to 30% by mole and a high epoxidation rate modified diene polymer with an epoxidation rate of 40 to 90% by mole, and
a content ratio of a content of the low epoxidation rate modified diene polymer to a content of the high epoxidation rate modified diene polymer is 20:80 to 80:20.

2. The pneumatic tire according to claim 1 , wherein the thickness of the adhesive layer is 5 to 200 μm.

3. The pneumatic tire according to claim 1 , wherein each of the two or more kinds of the modified diene polymer is selected from the group consisting of an epoxidized natural rubber, an epoxidized polyisoprene rubber, and an epoxidized polybutadiene rubber.

4. The pneumatic tire according to claim 1 , wherein the inner liner is a multi-layer film with 5 or more layers.

5. The pneumatic tire according to claim 4 , wherein the inner liner is a multi-layer film with 21 or more layers.

6. The pneumatic tire according to claim 1 , wherein the inner liner contains the thermoplastic resin film with one or two or more layers; and one or two or more layers formed of a resin composition containing an elastomer.

Assignees

• Ogasawara Takuya
• Chiashi Hideyuki
• Kitano Hideki
• Bridgestone Corp

Inventors

• Ogasawara Takuya
• Chiashi Hideyuki
• Kitano Hideki

Classifications

• B60C2005/145

  made of laminated layers · CPC title

• B60C1/0008

  Compositions of the inner liner · CPC title

• B60C5/14 Primary

  with impervious liner or coating on the inner wall of the tyre · CPC title

• C09J109/00

  Adhesives based on homopolymers or copolymers of conjugated diene hydrocarbons · CPC title

• C09J115/00

  Adhesives based on rubber derivatives (C09J111/00, C09J113/00 take precedence) · CPC title