Thermoplastic elastomer composition, process for producing the same, and pneumatic tire and hose made with the same

US6359071B1 · kind B1 · 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: Dec 7, 1999
• Grant date: Mar 19, 2002
• Expiry date: Dec 7, 2019

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. 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;A/&phgr;B)&times;(&eegr;B/&eegr;A)<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;D/&phgr;C)&times;(&eegr;C/&eegr;D)<1.0, wherein &phgr;A: volume fraction of rubber composition (A), &phgr;B: volume fraction of resin (B), &eegr;A: melt viscosity of rubber composition (A), &eegr;B: melt viscosity of resin (B), &phgr;C: volume fraction of composition (C), &phgr;D: volume fraction of rubber composition (D), &eegr;C: melt viscosity of composition (C), &eegr;D: melt v…