Bridgestone Corporation

Kuraray Co., Ltd.

Tetsuo Amamoto

Masao Hikasa

Hideki Kitano

Takatsugu Tanaka

Nahoto Hayashi

Yusuke Tanaka

Yuwa Takahashi

Shinji Tai

Koji Masaki

Hiroshi Kawai

Kohei Suzuki

Kouta Isoyama

Satoshi Yamakoshi

Hashimoto Masayuki

Provided is an inner liner for a pneumatic tire including no less than 8 resin-layers, the resin-layer having a layer A constituted with a resin composition containing a resin having gas barrier properties, and a layer B that is adjacent to the layer A and is constituted with a resin composition containing an elastomer, an extensional viscosity &#x3b7;of the resin composition of the layer A, and an extensional viscosity &#x3b7;of the resin composition of the layer B as determined at a predetermined temperature both being no less than 1,000 Pa&#xb7;s, and an extensional viscosity ratio &#x3b7;/&#x3b7;being no less than 0.2 and no greater than 10.

Inner liner for pneumatic tire, method for producing the same, and pneumatic tire

A multilayered structure having a layer A constituted with a resin composition containing a gas barrier resin, and a layer B being adjacent to the layer A and being constituted with a resin composition containing an elastomer. The total number of the layer A and the layer B is at least 7. The average thickness of the layer A in terms of a single layer is no less than 0.001 &#x3bc;m and no greater than 10 &#x3bc;m, and the average thickness of the layer B in terms of a single layer is no less than 0.001 &#x3bc;m and no greater than 40 &#x3bc;m. The multilayered structure is formed by irradiating with an active energy ray. Furthermore, an inner liner having the multilayered structure, and a pneumatic tire provided with the inner liner are provided.

Multilayered structure, inner liner having the same, and pneumatic tire

To provide a multilayer structure having high gas bather property and crack resistance as well as excellent fatigue resistance, an inner liner for a pneumatic tire using the multilayer structure, and a pneumatic tire comprising the inner liner. According to the present invention, the multilayer structure includes a barrier layermade of polymer material with 50% or less elongation at break conforming to JIS K 7113 at 20&#xb0; C. and 65% RH and an elastomer layermade of polymer material with 100% or more elongation at break conforming to JIS K 7113 at 20&#xb0; C. and 65% RH, wherein a plastic deformation amount at the time of 100% strain input is larger than a deformation amount at a tolerance point.

Multilayer structure, inner liner for pneumatic tire, and pneumatic tire

Disclosed is an inner liner for a pneumatic tire, the inner liner including no less than 8 resin-layers, the resin-layer having a layer A constituted with a resin composition containing a gas barrier resin, and a layer B constituted with a resin composition containing an elastomer, at least one of the resin compositions included in the layer A and the layer B that are adjacent with each other containing a metal salt, the content of the metal salt being no less than 1 ppm and no greater than 10,000 ppm in terms of metal element equivalent, and an interlayer adhesive force between the layer A and the layer B being no less than 500 g/15 mm. The layer A and the layer B are preferably alternately laminated.

Inner liner for pneumatic tire and method for producing the same

To provide a multilayer structure having high gas barrier property and crack resistance as well as excellent fatigue resistance, an inner liner for a pneumatic tire using such a multilayer structure, and a pneumatic tire comprising the inner liner. According to the present invention, in a multilayer structureincluding a barrier layerand an elastomer layer, a proportion of a thickness of the elastomer layerin the multilayer structure ((U+U+ . . . +Un)/T) is 60% or more.

To provide a multilayer structure that may adhere to rubber material without the necessity of providing an adhesive layer, an inner liner and a pneumatic tire using the multilayer structure. According to the present invention, a multilayer structureis formed by alternately laminating elastomer layerscontaining thermoplastic elastomer and barrier layerscontaining a gas barrier resin, wherein an outermost layerlaminated uppermost among layers constituting the multilayer structurecontains an elastomer component that may heat-adhere to diene rubber.

The present invention provides a vulcanized rubber capable of improving ice performance of the tire, in particular a vulcanized rubber which is made by vulcanizing a rubber component and has cells with an aspect ratio of 1-30 of which at least a part of a wall surface is hydrophilic.

Vulcanized rubber, method of manufacturing same and tire

The present invention provides a rubber composition that may improve fracture resistance of the resulting tire while maintaining good drainage performance, and a tire using the same. The rubber composition includes: a rubber component; and a fiber made of a hydrophilic resin. The fiber is formed with a coating layer on its surface. The coating layer is made of a resin having affinity for the rubber component.

Rubber composition, vulcanized rubber and tire manufactured using the same

The present invention relates to a rubber composition capable of sustaining improved on-ice performance of a tire over a long period of time. Specifically, the present invention provides a rubber composition having a rubber component (A) and a composite fiber (B), wherein the composite fiber (B) comprises: a fiber (B) made of a hydrophilic resin; a covering layer (B) made of a resin having an affinity for a rubber component and provided to cover at least a portion of the fiber; and a bonding layer (B) present at least in a portion of an interface between the fiber (B) and the covering layer (B) and having affinities for both the hydrophilic resin and the resin having an affinity for the rubber component.

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Kodaira, Japan

Tetsuo Amamoto