Bridgestone Corporation

Bridgestone Corporaiton

Yuki Itoh

Yasunori Tarutani

Yoichi Ozawa

Ken Tanaka

Junko Matsushita

Hiroyuki Fudemoto

Eiju Suzuki

Ryuji Nakagawa

Kenji Nakatani

Noriko Mori

Shigeaki Matsuo

Kouji Masaki

Masaki Yanagioka

Mari Miyano

Fumihiro Shiraishi

Soichi Kyo

Fuminori Oota

Midori Kawada

Midori Sugawa

Ryouta Tamate

A tire includes a circular tire frame including a resinous material. The resinous material includes a thermoplastic elastomer including a hard segment (HS) and a soft segment (SS), and 55% or more of molecular chain terminals of the thermoplastic elastomer are hard segments (HS).

Tire

A tire including a tire skeleton body that is made of a resin material containing a polyamide-based thermoplastic elastomer and has a ring shape, wherein the polyamide-based thermoplastic elastomer includes a hard segment, a soft segment consisting of a constituent unit derived from polypropylene glycol, and a binding portion that binds two or more segments and that consists of a constituent unit derived from a dicarboxylic acid of from 6 to 20 carbons, the polyamide-based thermoplastic elastomer having a weight average molecular weight of from 20,000 to 250,000.

A tire including a tire frame that is formed of a resin material and has a circular form, the resin material including a thermoplastic elastomer having a hard segment and a soft segment, and a polymer compound that has the same structural unit as the structural unit of the soft segment and which is different from the thermoplastic elastomer, a content of the polymer compound in the tire frame being from 0.20 parts by mass to 2.5 parts by mass with respect to 100 parts by mass of the thermoplastic elastomer contained in the tire frame.

There is provided a tire including a tire frame that is formed of a resin material and has a circular form, wherein the resin material includes a thermoplastic elastomer having a hard segment (HS) and a soft segment (SS), in which only one unit of the soft segment (SS) is included in a single molecular chain, and both terminals of the single molecular chain are formed by the hard segment (HS), the thermoplastic elastomer having a number average molecular weight of from 12,000 to 24,000.

There is provided a tire comprising a tire frame that is formed of a resin material and has a circular form, wherein the resin material comprises a thermoplastic elastomer having a structure including a hard segment (HS) and a soft segment (SS), which repeat alternately, in which a number of repeating units in one molecular chain is from 2 to 10, each of the repeating units being a pair of the hard segment (HS) and the soft segment (SS), the thermoplastic elastomer having a number average molecular weight of from 45,000 to 160,000.

A tire includes a circular tire frame formed of a resin material, the resin material including a polyamide-based thermoplastic elastomer having a weight average molecular weight of from 15,700 to 75,000. Included with the tire may be side portions and a crown portion that serves as an outer peripheral portion that is in communication with the side portions.

The invention provides a method for producing a modified conjugated diene (co)polymer, the method including comprising: a modification reaction step including causing an organic silane compound to react with a conjugated diene (co)polymer having an active site at the active site, the organic silane compound having a characteristic group for forming a silanol group through hydrolysis and, in the vicinity of the characteristic group, (i) a functional group which binds the organic silane compound to the conjugated diene (co)polymer via addition to or substitution at the active site and which promotes reaction between the silanol group and a reinforcing filler after the addition or substitution reaction, or (ii) a functional group which promotes reaction between the silanol group and a reinforcing filler, and a hydrolyzation step performed after the modification reaction step; a modified conjugated diene (co)polymer having, at a molecular end of the conjugated diene (co)polymer, a silanol group, and a functional group in the vicinity of the silanol group, the functional group accelerating reaction between the silanol group and the reinforcing filler; a rubber composition containing the (co)polymer and carbon black having specific characteristics; and a tire formed from the rubber composition.

Method for producing modified conjugated diene polymer/copolymer, modified conjugated diene polymer/copolymer, and rubber composition and tire using the same

An object of the present invention is to provide a rubber composition for a tire, capable of achieving both good rolling resistance properties and good wear resistance in a sufficiently compatible manner when the rubber composition is applied to a component member of a tire. Specifically, the present invention provides a rubber composition comprising a rubber composition and hydrated silica, wherein 'CTAB' (m/g) as specific surface area by cetyltrimethylammonium bromide adsorption and 'IB' as ink bottle-shaped micropore index, of the hydrated silica, satisfy a specific relationship and &#x201c;weight loss on ignition&#x201d; as weight loss when the hydrate silicate is heated at 750&#xb0; C. for 3 hours and &#x201c;weight loss on heating&#x201d; as weight loss when the hydrate silicate is heated at 105&#xb0; C. for 2 hours satisfy a specific relationship.

Rubber composition for tire, vulcanized rubber composition for tire, and tires using same

Provided are a modifying agent obtained by subjecting a silicon-containing compound having a protected primary amino group and at least two hydrolyzable groups to complete condensation, a method of producing a modified conjugated diene-based polymer, a modified conjugated diene-based polymer obtained by the production method, a rubber composition using the polymer, and a pneumatic tire. The modified conjugated diene-based polymer has excellent low heat generating property and abrasion resistance, and the rubber composition is obtained by using the modified conjugated diene-based polymer and the pneumatic tire is obtained by using the rubber composition.

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Tokyo, Japan

Yuki Itoh