Bridgestone Corporation

Keita Oshikane

Yuki Nakamura

Nobuyuki Hirai

Takashi Kuwahara

Kentaro Mizotani

Yukio Sugita

Yasuma Saito

Toshio Furutaka

A tirehas a decoration portionusing a paint on a surface of a side portion. The decoration portionhas a white paint layerformed on at least a part of the decoration portion, a color paint layerdisposed by laminating on the white paint layerand having a thickness less than the thickness of the white paint layer, and a protective layerdisposed by laminating on the color paint layerand having the thickness less than the thickness of the white paint layer. The elastic modulus of the protective layer is larger than the elastic modulus of the white paint layer and the color paint layer. A thickness of the decoration portionas a whole, including the white paint layer, the color paint layerand the protective layer, is 150 &#x3bc;m or less.

Tire

Provided is a pneumatic tire including, on an outer surface of its sidewall portion, a decorative portion including a print layer and a protective layer located on a tire outer side of the print layer. The decorative portion further includes an intermediate layer located between the print layer and the protective layer. When a storage modulus of the print layer, a storage modulus of the protective layer, and a storage modulus of the intermediate layer are respectively defined as E1', E2&#x2032;, and E3&#x2032;, the following relational expression is satisfied: E2&#x2032;&#x3e;E3&#x2032;&#x3e;E1&#x2032;.

Pneumatic tire with layered decorative portion on sidewall outer surface

Provided is a pneumatic tire including, on an outer surface of its sidewall portion, a decorative portion including a print layer and inner and outer layers respectively disposed on tire inner and outer sides of the print layer. When storage moduli at 25&#xb0; C. of the print, inner, and outer layers are respectively defined as E1', E2&#x2032;, and E3&#x2032;, E1&#x2032;&#x3c;E2&#x2032; and E1&#x2032;&#x3c;E3&#x2032; are satisfied. When storage moduli at 80&#xb0; C. of the print, inner, and outer layers are respectively defined as E1&#x2032;, E2&#x2032;, and E3&#x2032;, and storage modulus variations &#x3b1;1, &#x3b1;2, and &#x3b1;3 at high temperature of the print, inner, and outer layers are respectively defined as &#x3b1;1=|E1&#x2032;&#x2212;E1&#x2032;|/E1&#x2032;, &#x3b1;2=|E2&#x2032;&#x2212;E2&#x2032;|/E2&#x2032;, and &#x3b1;3=|E3&#x2032;&#x2212;E3&#x2032;|/E3&#x2032;, &#x3b1;1&#x3c;&#x3b1;2 and &#x3b1;1&#x3c;&#x3b1;3, and E2&#x2032;&#x3e;E2&#x2032; and E3&#x2032;&#x3e;E3&#x2032; are satisfied.

Pneumatic tire with sidewall decorative portion inner layer, print layer, and outer layer

Growing community of inventors

Tachikawa, Japan

Keita Oshikane