Multilayer structure, inner liner for pneumatic tire, and pneumatic tire
AssigneesBridgestone Corporation, Kuraray Co., Ltd.
InventorsHideki Kitano, Tetsuo Amamoto, Takatsugu Tanaka, Nahoto Hayashi, Masao Hikasa, Yusuke Tanaka
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Abstract
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 structure 1 including a barrier layer 2 and an elastomer layer 3, a proportion of a thickness of the elastomer layer 3 in the multilayer structure ((U1+U2+ . . . +Un)/T) is 60% or more.
Claims10
A multilayer structure comprising barrier layers and elastomer layers,
- wherein a proportion of a thickness of the elastomer layers in the multilayer structure is 80% or more,
- wherein each barrier layer consists of a resin of ethylene-vinyl alcohol copolymer and/or modified ethylene-vinyl alcohol copolymer,
- wherein a thickness of each barrier layer is 10 μm or less,
- wherein a thickness of each elastomer layer is within a range of 0.001 to 40 μm,
- wherein an elastomer component contained in each elastomer layer is polyurethane-based thermoplastic elastomer, and JIS-A hardness of the elastomer layer is 85 or less,
- wherein the barrier layers and the elastomer layers are alternately laminated to form a laminate having nine or more layers in total, and
- wherein the laminate has top and bottom layers which are elastomer layers located in an external portion that are thicker than the barrier and elastomer layers sandwiched therebetween.
Dependencies are inferred from the claim text.