The Yokohama Rubber Co., Ltd.

Hideo Nemoto

Yuichi Hara

Jiro Watanabe

Shigeru Yamauchi

Daisuke Kanenari

Tetsuji Kawazura

Kazuto Yamakawa

Noriaki Kuroda

Gou Kawaguchi

Thermoplastic elastomer composition dynamically vulcanized with a 50 to 95% gelation rate has superior heat resistance, durability, and air permeation prevention, is flexible and usable as a pneumatic tire air permeation preventive layer. A composition having reduced domain rubber particle size is produced from a high rubber ratio material by mixing composition (C) under melt viscosities ratio of rubber composition (A)/resin (B) of 0.8 to 1.2 and formula (&#x3c6;/&#x3c6;)&#xd7;(&#x3b7;/&#x3b7;)&#x3c;1.0 under melt viscosities ratio of rubber composition (D)/composition (C) of 0.8 to 1.2 and formula (&#x3c6;/&#x3c6;)&#xd7;(&#x3b7;/&#x3b7;)&#x3c;1.0, wherein &#x3c6;, &#x3c6;, &#x3c6;and &#x3c6;are volume fractions of rubber composition (A) and resin (B), composition (C) and rubber composition (D), respectively, &#x3b7;&#x3b7;, &#x3b7;, and &#x3b7;are melt viscosities of rubber composition (A), resin (B), composition (C), and rubber composition (D), respectively. The thermoplastic elastomer composition may have an elastomer composition (A) dispersion phase and a thermoplastic resin composition (B) matrix.

Thermoplastic elastomer composition and process for producing the same and pneumatic tire and hose using the same

A thermoplastic elastomer composition dynamically vulcanized to a gelation rate of 50 to 95% which is superior in heat resistance and durability while maintaining flexibility and superior in air permeation preventive property which can be efficiently used as, for example, a pneumatic tire as an air permeation preventive layer. The method includes mixing a composition (C) mixed under conditions of a ratio of melt viscosities of the rubber composition (A)/resin (B) of 0.8 to 1.2 and the formula (&#x3c6;/&#x3c6;)&#xd7;(&#x3b7;/&#x3b7;)&#x3c;1.0 under conditions of a ratio of melt viscosities of the rubber composition (D)/composition (C) of 0.8 to 1.2 and the formula (&#x3c6;/&#x3c6;)&#xd7;(&#x3b7;/&#x3b7;)&#x3c;1.0, wherein &#x3c6;: volume fraction of rubber composition (A), &#x3c6;: volume fraction of resin (B), &#x3b7;: melt viscosity of rubber composition (A), &#x3b7;: melt viscosity of resin (B), &#x3c6;: volume fraction of composition (C), &#x3c6;: volume fraction of rubber composition (D), &#x3b7;: melt viscosity of composition (C), &#x3b7;: melt viscosity of rubber composition (D).

A thermoplastic elastomer composition dynamically vulcanized to a gelation rate of 50 to 95% which is superior in heat resistance and durability while maintaining flexibility and superior in air permeation preventive property which can be efficiently used as, for example, a pneumatic tire as an air permeation preventive layer.

A thermoplastic elastomer composition dynamically vulcanized to a gelation rate of 50 to 95% which is superior in heat resistance and durability while maintaining flexibility and superior in air permeation preventive property which can be efficiently used as, for example, a pneumatic tire as an air permeation preventive layer. In particular, a thermoplastic elastomer composition having a reduced particle size of the domain rubber is produced by a material having a high rubber ratio by mixing a composition (C) mixed under conditions of a ratio of melt viscosities of the rubber composition (A)/resin (B) of 0.8 to 1.2 and the formula (&phgr; /&phgr; )&times;(&eegr; /&eegr; )<1.0 under conditions of a ratio of melt viscosities of the rubber composition (D)/composition (C) of 0.8 to 1.2 and the formula (&phgr; /&phgr; )&times;(&eegr; /&eegr; )<1.0, wherein &phgr; : volume fraction of rubber composition (A), &phgr; : volume fraction of resin (B), &eegr; : melt viscosity of rubber composition (A), &eegr; : melt viscosity of resin (B), &phgr; : volume fraction of composition (C), &phgr; : volume fraction of rubber composition (D), &eegr; : melt viscosity of composition (C), &eegr; : melt viscosity of rubber composition (D).

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Hiratsuka, Japan

Hideo Nemoto