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

Patent metadata

Field	Value
Publication number	US-9925831-B2
Application number	US-201214119938-A
Country	US
Kind code	B2
Filing date	May 29, 2012
Priority date	May 31, 2011
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

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 layer 2 made of polymer material with 50% or less elongation at break conforming to JIS K 7113 at 20° C. and 65% RH and an elastomer layer 3 made of polymer material with 100% or more elongation at break conforming to JIS K 7113 at 20° 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.

First claim

The invention claimed is:

1. A multilayer structure comprising barrier layers consisting of ethylene-vinyl alcohol copolymer and/or modified ethylene-vinyl alcohol copolymer with 50% or less elongation at break conforming to JIS K 7113 at 20° C. and 65% RH and elastomer layers made of polyurethane-based thermoplastic elastomer with 640% or more elongation at break conforming to JIS K 7113 at 20° C. and 65% RH, wherein
a difference between an input deformation amount of the multilayer structure at the time of 100% deformation input and a plastic deformation amount of the multilayer structure at the time of 100% deformation input is larger than a deformation amount at a tolerance point,
wherein an oxygen permeability coefficient of the barrier layers at 20° C. and 65% RH is 10.0 cc·mm/m 2 ·day·atm or less,
wherein the barrier layers and the elastomer layers are laminated to form the multilayer structure having 7-3000 layers, and
wherein each of thickness of the barrier layers and the elastomer layers is within a range of 0.001-40 μm.

2. The multilayer structure according to claim 1 , wherein a thickness of the barrier layers is 10 μm or less.

3. The multilayer structure according to claim 1 wherein the barrier layers and the elastomer layers are crosslinked by irradiation of active energy rays.

4. An inner liner for a pneumatic tire using the multilayer structure according to claim 1 .

5. A pneumatic tire comprising the inner liner for a pneumatic tire according to claim 4 .

Assignees

• Amamoto Tetsuo
• Hayashi Nahoto
• Hikasa Masao
• Tanaka Yusuke
• Bridgestone Corp
• Kuraray Co

Inventors

• Amamoto Tetsuo
• Hayashi Nahoto
• Hikasa Masao
• Tanaka Yusuke

Classifications

• B32B2307/7244

  Oxygen barrier · CPC title

• B32B25/14

  comprising {synthetic rubber copolymers (B32B25/18 and B32B25/20 take precedence)} · CPC title

• Y10T428/31855

  Of addition polymer from unsaturated monomers · CPC title

• Y10T428/31786

  Of polyester [e.g., alkyd, etc.] · CPC title

• Y10T428/269

  including synthetic resin or polymer layer or component · CPC title