The Yokohama Rubber Co., Ltd.

Takeshi Hotaka

Osamu Ozawa

Ryotaro Suefuji

Yasuhiro Ishikawa

Makio Mori

Daisuke Kanenari

Naoya Amino

Wonmun Choi

Takashi Shirokawa

Tomoyuki Matsumura

Kazuhiro Takase

Junichirou Natori

A rubber composition containing 100 parts by weight a sulfur-vulcanizable rubber (A) and 0.1 to 30 parts by weight of a vulcanization agent of a cyclic polysulfide (B) having the formula (I): wherein R is a substituted or unsubstituted Cto Calkylene group, substituted or unsubstituted Cto Coxyalkylene group or alkylene group having an aromatic ring, n is an integer of 1 to 20, x is a number of 2 to 6 on average.

Rubber composition containing cyclic polysulfide as vulcanization agent and pneumatic tire using the same

A run-flat tire-wheel assembly having, in an inside cavity of the tire/rim, a run-flat support formed by a ring-shaped metal shell and rubber elastic members or a ring-shaped metal shell and rubber elastic members composed of a rubber composition containing 100 parts by weight of a peroxide cross-linkable rubber and 1 to 30 parts by weight of a peroxide cross-linking agent, wherein the contact surfaces of the ring-shaped metal shell with the rubber elastic members are subjected to an electrolytic polymerization with 6-mono- or di-allylamino-1,3,5-triazine-2,4-dithiol or its mono- or di-salt, whereby the bondability between the ring-shaped metal shell and rubber elastic members is improved.

Tire-wheel assembly

A run flat tire wheel assembly having a flat run support formed by a ring-shaped metal shell and rubbery elastic members in a tire rim cavity, said tire wheel assembly improving bondability between the ring-shaped metal shell and rubbery elastic members by making said rubbery elastic member from a rubber composition including 100 parts by weight of a diene-based rubber, 40 to 90 parts by weight of carbon black, 3 to 8 parts by weight of sulfur, 0.1 to 1 part by weight of an organic acid cobalt salt in terms of content of cobalt element, 0.1 to 3 parts by weight of a phenylene-diamine-based antiaging agent, and 1 to 6 parts by weight of a resol-type alkylphenol resin.

Tire wheel assembly

A rubber composition for a tire comprising 100 parts by weight of diene rubber and 1 to 30 parts by weight of expandable graphite having a particle size of 30 to 600 &#x3bc;m.

Radial tire derived from rubber composition containing expandable graphite

A rubber composition comprising 100 parts by weight of a diene rubber and 0.5 to 20 parts by weight of a foaming agent-containing resin containing 5 to 65% by weight of a chemical foaming agent, wherein the resin is mainly a polyolefin resin which is not co-crosslinkable with the diene rubber and wherein the rubber composition is structured having microcapsule-shaped bubbles coated with a resin layer after vulcanization of the rubber.

Growing community of inventors

Hiratsuka, Japan

Takeshi Hotaka