Bridgestone Corporation

Ube Industries, Inc.

Uchu Mukai

Takashi Shimada

Kouichi Morita

Kazuhiro Yanagisawa

Naomi Okamoto

Tetsuya Omura

Hideaki Yokoyama

Michitaka Takeshita

Kazuaki Someno

Toshio Sugawara

Masanori Kawamura

Tetsuya Omara

Kazuhide Sato

Kazuhiko Misumi

The present invention relates to an activated silane compound obtained by reacting a hydrocarbyloxysilane compound with an organic metal compound in an organic solvent, and enhancing interaction of silica with carbon black and improving the fracture characteristic, the abrasion resistance and the low heating property provide an activated silane compound which can be reduced in a blending amount, a rubber composition prepared by blending it as a silane coupling agent and a pneumatic tire prepared by using the above rubber composition, which is excellent in a durability, a low heating property and the like.

Activated silane compound, rubber composition using the same and tire

The natural rubber master batch of the present invention is prepared by mixing a natural rubber latex having its amide linkages cleaved and an aqueous slurry having a filler dispersed in water. Alternatively, the natural rubber master batch is prepared by a method including a step for mixing a natural rubber latex and an aqueous slurry containing dispersed fillers having a specific particle size distribution and a limited range of 24M4DBP absorption. The natural rubber composition of the present invention is prepared by compounding natural rubber, which contains non-rubber components prepared by cleaving amide linkages of natural rubber latex, with silica and/or a particular inorganic filler.

Natural rubber master batch, production method thereof, and natural rubber composition

There are disclosed a resin-reinforced elastomer which comprises as principal components, a rubber and a polyolefin having an average particle diameter of at most 1 .mu.m, and in which the rubber and the polyolefin are linked together; a process for producing the resin-reinforced elastomer by melt kneading a polyolefin, a No.1 rubber and a binding agent to prepare a thermoplastic composition, adding a No.2 rubber to the resultant thermoplastic composition and melt kneading the mixture thus formed to disperse the polyolefin in the rubber components; and a pneumatic tire using the resin-reinforced elastomer in its tread. The above resin-reinforced elastomer has a uniform modulus and a low density, is minimized in directionality, and is excellent in tensile strength, fatigue resistance and abrasion resistance.

Resin-reinforced elastomer, process for producing same and pneumatic

The present invention provides a rubber composition in which the coexistence of low heat build-up, heat resistance and high hardness can be achieved without damaging failure characteristics. According to the present invention, a rubber composition comprising a 100 parts by weight of matrix rubber and a 2-75 parts by weight of a polyethylene composition which contains 0-80% by weight of polyethylene and 20% by weight or more of a composite comprising a polyethylene component and a rubber component previously bonded via a coupling agent to the polyethylene component, said rubber component is crosslinked with the matrix rubber. At least at one of the kneading stages before the final stage, the compound is kneaded so that the maximum temperature of the compound of the kneading of that stage is higher than the melting point of the polyethylene component mixed, preferably, by 10.degree. C. or more.

Rubber composition containing cross linkable polyethylene

A pneumatic tire comprises a tread of cap and base structure, in which a rubber composition comprising a particular amount of a specified rubber-reinforcing thermoplastic resin containing not less than 10% by weight of a conjugated diene rubber component and the balance being a resin component and having a particular glass transition temperature is used in a tread base rubber of the tread and has excellent chipping resistance, cut resistance and durability to heat build-up.

Pneumatic tire with cap and base structure

A rubber composition comprises natural rubber and/or a diene based synthetic rubber, and carbon black. The carbon black has characteristics that a line-width .DELTA.H (mT) in an electron spin resonance (ESR) satisfies .DELTA.H(mT).gtoreq..sub.e 0.11T-7.56+5 in which T is a colored transmittance (%) falling in a range of 100-60%, and an N.sub.2 SA value of the carbon black is not less than 114 m.sup.2 /g to 250 m.sup.2 g.

Rubber compositions

A rubber composition for tires having improved heat build-up and high temperature reinforcibility comprises specified amounts of particular surface-treated carbon black, silica and particular silane coupling agent based on 100 parts by weight of rubber ingredient.

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Tokyo, Japan

Uchu Mukai