The Yokohama Rubber Co., Ltd.

Gou Kawaguchi

Noriaki Kuroda

Jiro Watanabe

Tetsuji Kawazura

Osamu Ozawa

Kazuto Yamakawa

Yuichi Hara

Yoshihiro Soeda

Hidekazu Takeyama

Shigeru Yamauchi

Daisuke Kanenari

Hideo Nemoto

Yoshiaki Hashimura

Hiroyuki Kaido

Masahiro Ikawa

Kazuo Suga

Daisuke Irii

Giro Watanabe

Takashi Satoh

Susumu Hatanaka

Yoshihiro Inomata

Yoshihiro Aoyagi

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).

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.

Process of production of pneumatic tire

A pneumatic tire having an air permeation preventive layer comprising a low permeability thermoplastic elastomer composition comprising a thermoplastic elastomer having a thermoplastic resin composition as a continuous phase and a rubber composition as a dispersed phase, in which a barrier resin composition is contained, which low permeability thermoplastic elastomer composition has a phase structure in which the barrier resin composition is dispersed in the form of a flat state in the thermoplastic elastomer, is abundant in flexibility, is superior in gas permeation preventive property, and enables the tire to be reduced in weight.

Pneumatic tire with colored thermoplastic elastomer layer adjacent a black-concealing 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).

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

A polymer composition for a tire having an air permeation coefficient of 25&times;10 cc&middot;cm/cm &middot;sec &middot;cmHg (at 30&deg; C.) or less and a Young's modulus of 1 to 500 MPa, including (A) at least 10% by weight, based on the weight of the total polymer component, of at least one thermoplastic resin having an air permeation coefficient of not more than 25&times;10 cc&middot;cm/cm &middot;sec&middot;cmHg (at 30&deg; C.) and a Young's modulus of more than 500 MPa and (B) at least 10% by weight, based on the total weight of the polymer component, of at least one elastomer component having an air permeation coefficient of more than 25&times;10 cc&middot;cm/cm &middot;sec&middot;cmHg (at 30&deg; C.) and a Young's modulus of not more than 500 MPa, wherein the total amount (A)&plus;(B) of the component (A) and the component (B) is not less than 30% by weight based on the weight of the total polymer component, and a pneumatic tire obtained therefrom.

Polymer composition for tire and pneumatic tire using same

Thermoplastic elastomer composition, hose comprising thermoplastic

A covering material composition for a golf ball, which comprises an ionomer resin and a diene rubber, the diene rubber being dispersed in the ionomer resin. The covering material composition is produced by mixing the ionomer resin with the diene rubber to disperse the diene rubber in the ionomer resin.

Covering material composition for golf ball and process for producing

A polymer composition for a tire having an air permeation coefficient of 25.times.10.sup.-12 cc.multidot.cm/cm.sup.2 .multidot.sec.multidot.cmHg (at 30.degree. C.) or less and a Young's modulus of 1 to 500 MPa, including (A) at least 10% by weight, based on the weight of the total polymer component, of at least one thermoplastic resin having an air permeation coefficient of not more than 25.times.10.sup.-12 cc.multidot.cm/cm.sup.2 .multidot.sec.multidot.cmHg (at 30.degree. C.) and a Young's modulus of more than 500 MPa and (B) at least 10% by weight, based on the total weight of the polymer component, of at least one elastomer component having an air permeation coefficient of more than 25.times.10.sup.-12 cc.multidot.cm/cm.sup.2 .multidot.sec.multidot.cmHg (at 30.degree. C.) and a Young's modulus of not more than 500 MPa, wherein the total amount (A)+(B) of the component (A) and the component (B) is not less than 30% by weight based on the weight of the total polymer component, and a pneumatic tire obtained therefrom.

Pneumatic tire made by using lowly permeable thermoplastic elastomer

A thermoplastic elastomer composition containing a thermoplastic resin component including 10 to 95% by weight of a polypropylene having a syndiotactic structure and an elastomer component and having a value of .alpha., defined as follows, of 1 or less:

Thermoplastic elastomer composition

Thermoplastic elastomer composition and process for production thereof

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Hiratsuka, Japan

Gou Kawaguchi