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

US6861470B2 · kind B2 · utility

Assignee

• The Yokohama Rubber Co., LTD. · JP

Inventors

• Jiro Watanabe · Tokyo, JP
• Kazuto Yamakawa · Yokohama, JP
• Daisuke Kanenari · Hiratsuka, JP
• Noriaki Kuroda · Soma, JP
• Gou Kawaguchi · Hiratsuka, JP
• Yuichi Hara · Hiratsuka, JP
• Tetsuji Kawazura · Hiratsuka, JP
• Shigeru Yamauchi · Hiratsuka, JP
• Hideo Nemoto

Key dates

• Filing date: Jan 21, 2003
• Grant date: Mar 1, 2005
• Expiry date: Apr 27, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T152/10495
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

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 (φA/φB)×(ηB/ηA)<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 (φD/φC)×(ηC/ηD)<1.0, wherein φA: volume fraction of rubber composition (A), φB: volume fraction of resin (B), ηA: melt viscosity of rubber composition (A), ηB: melt viscosity of resin (B), φC: volume fraction of composition (C), φD: volume fraction of rubber composition (D), ηC: melt viscosity of composition (C), ηD: melt viscosity of rubber composition (D).