Bridgestone Corporation

Other

Jsr Corporation

Sony Corporation

Koji Masaki

Yoichi Ozawa

Takuo Sone

H Jerrold Miller

Iwakazu Hattori

Tatsuo Fujimaki

Koichi Morita

Tetsuya Omura

Toshihiro Tadaki

Ryouji Tanaka

Kouichirou Tani

Junko Kurazumi

Steven Luo

Takahiro Nakamura

Tetsuo Amamoto

Fuminori Ohta

William L Hergenrother

David F Lawson

Xiaorong Wang

Victor J Foltz

Thomas A Antkowiak

David M Roggeman

Shigeaki Matsuo

Tatsuro Hamada

Yoshikatsu Hatakeyama

Tetsuyo Omura

Keisuke Kidono

Luo Steven

Jerrold H Miller

Tetsuya Ohmura

This invention provides a rubber composition being excellent in the workability during production and the heat resistance and high in the storage elastic modulus (G') and small in the loss tangent (tan &#x3b4;), which is formed by compounding 1-60 parts by mass of a low-molecular weight conjugated diene-based polymer (B) having a weight average molecular weight as measured through a gel permeation chromatography and converted to polystyrene of 10,000-200,000 and a vinyl bond content in a conjugated diene compound portion of not less than 40% based on 100 parts by mass of a rubber component (A) comprised of at least one selected from the group consisting of natural rubber, polyisoprene rubber, styrene-butadiene copolymer rubber, polybutadiene rubber and isobutylene isoprene rubber, wherein the rubber component (A) comprises natural rubber and/or polyisoprene rubber and a proportion of styrene units in total of the low-molecular weight conjugated diene-based polymer (B) is less than 5% by mass.

Rubber compostion and pneumatic tire using the same

In general the present invention provides a functionalized polymer prepared by a process comprising the steps of preparing a pseudo-living polymer by polymerizing conjugated monomer with a lanthanide-based catalyst, and reacting the pseudo-living polymer with a functionalizing agent defined by the formula (I)A-R&#x2014;Z&#x2003;&#x2003; (I)where Ris a divalent bond or divalent organic group comprising from 0 to about 20 carbon atoms, A is a substituent that will undergo an addition reaction with a pseudo-living polymer, and Z is a substituent that will react or interact with silica or carbon black reinforcing fillers, with the proviso that A, R, and Z are substituents that will not protonate a pseudo-living polymer.

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The present invention provides a vulcanized rubber capable of improving ice performance of the tire, in particular a vulcanized rubber which is made by vulcanizing a rubber component and has cells with an aspect ratio of 1-30 of which at least a part of a wall surface is hydrophilic.

Vulcanized rubber, method of manufacturing same and tire

The present invention relates to a run-flat tire employing a rubber composition capable of improving processability without reducing the durability during run-flat traveling. More specifically, the present invention relates to a run-flat tire comprising a bead fillerand a pair of side-reinforcing rubber layers. At least one of the bead fillerand the side-reinforcing rubber layeremploys a rubber composition obtained by adding 3 to 10 parts by mass of sulfur and 0.1 to 30 parts by mass of a low-molecular-weight conjugated diene-based polymer (B) having a weight average molecular weight in the range of 2,000 to 10,000, to 100 parts by mass of a rubber component (A) containing at least a natural rubber or polyisoprene rubber and having a weight average molecular weight in the range of 150,000 to 2,000,000.

Run-flat tire

The present invention relates to a rubber composition capable of sustaining improved on-ice performance of a tire over a long period of time. Specifically, the present invention provides a rubber composition having a rubber component (A) and a composite fiber (B), wherein the composite fiber (B) comprises: a fiber (B) made of a hydrophilic resin; a covering layer (B) made of a resin having an affinity for a rubber component and provided to cover at least a portion of the fiber; and a bonding layer (B) present at least in a portion of an interface between the fiber (B) and the covering layer (B) and having affinities for both the hydrophilic resin and the resin having an affinity for the rubber component.

Rubber composition and tire using the same

In general the present invention provides a functionalized polymer prepared by a process comprising the steps of preparing a pseudo-living polymer by polymerizing conjugated monomer with a lanthanide-based catalyst, and reacting the pseudo-living polymer with a functionalizing agent defined by the formula (I)A-R&#x2014;Z&#x2003;&#x2003;(I)where Ris a divalent bond or divalent organic group comprising from 0 to about 20 carbon atoms, A is a substituent that will undergo an addition reaction with a pseudo-living polymer, and Z is a substituent that will react or interact with silica or carbon black reinforcing fillers, with the proviso that A, R, and Z are substituents that will not protonate a pseudo-living polymer.

Functionalized high cis-1,4-polybutadiene prepared using novel functionalizing agents

A display capable of inhibiting deformation of a component during transport or the like and an electronic unit including the display are provided. A display includes: a main section; and a board-mounting plate disposed on one surface of the main section, and having a board-mounting region on a main surface on a side opposite to a side facing the main section, in which the board-mounting plate includes, at corners at both ends of a side of the mounting region, hook sections allowing corners of a board to be hooked thereto, and the hook sections each are fixed to the main surface on two sides of the corner of the mounting region.

Display and electronic unit

A method for preparing a functionalized polymer comprising the steps of preparing a polymer by polymerizing conjugated diene monomer with a lanthanide-based catalyst, wherein the lanthanide-based catalyst comprises (a) a lanthanide compound, (b) an alkylating agent, and (c) a source of halogen, and reacting the pseudo-living polymer with at least one amide-containing functionalizing agent.

This invention provides a rubber composition highly balancing flexibility at a low temperature and a low rolling resistance, which is formed by compounding a low-molecular weight conjugated diene-based polymer (B) having at least one functional group, an aromatic vinyl compound content of less than 5% by mass and a weight average molecular weight as measured without terminating by modification through a gel permeation chromatography and converted to polystyrene of not less than 2,000 but less than 150,000 and a filler (C) into a high-molecular weight rubber component (A) having a weight average molecular weight as measured without terminating by modification through a gel permeation chromatography and converted to polystyrene of not less than 150,000.

Rubber composition and pneumatic tire using the same

A process for simply and inexpensively producing a conjugated diene polymer with a narrow molecular weight distribution and a high cis-bond content at a low cost is provided. The process comprises a polymerization step, wherein a conjugated diene polymer having a cis-1,4-bond content of 98.5 mass % or more and a ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) measured by gel permeation chromatography of 2.5 or less is obtained by carrying out a polymerization reaction in conjugated diene compounds using a catalyst composition containing a rare earth element-containing compound or a reaction product of the rare earth element-containing compound with a Lewis base, an aluminoxane and/or organoaluminum compound, and an iodine-containing compound.

Process for producing conjugated diene polymer, conjugated diene polymer, and rubber composition

A process for producing a modified conjugated diene polymer includes subjecting an active terminal of a conjugated diene polymer having a vinyl content of less than 10% and a cis-1,4 bond content of 75% or more to a modification reaction with an alkoxysilane compound, and subjecting the alkoxysilane compound (residue) to a condensation reaction in an aqueous solution at a pH of 9 to 14 and a temperature of 85 to 180&#xb0; C. in the presence of a condensation accelerator including a compound containing titanium. The modified conjugated diene polymer exhibits low heat build-up and increased reinforcing properties when used for a rubber composition, and exhibits excellent wear resistance, mechanical characteristics, and processability.

Process for producing modified conjugated diene polymer, modified conjugated diene polymer obtained by the process, and rubber composition containing the same

A method for preparing a functionalized polymer comprising the steps of preparing a pseudo-living polymer by polymerizing conjugated diene monomer with a lanthanide-based catalyst, and reacting the pseudo-living polymer with at least one functionalizing agent defined by the formula (I) where A is a substituent that will undergo an addition reaction with a pseudo-living polymer, Ris a divalent organic group, Ris a monovalent organic group, and each R, which may be the same or different, is a monovalent organic group or a substituent defined by &#x2014;ORwhere Ris a monovalent organic group, with the proviso that A, R, R, R, and Rare substituents that will not protonate a pseudo-living polymer. Also, the functionalized polymer and a vulcanizable composition containing the polymer.

Modified polymers prepared with lanthanide-based catalysts

A reduced oil rubber composition includes (a) a silica filler, (b) a N-substituted polyalkylene succinimide derivative, and (c) a rubber matrix. In certain embodiments, the composition may comprise a reduced amount of oil, especially a reduced amount of aromatic oil or even no aromatic oil. Rubber articles manufactured from such composition, such as tires and power belts, have improved properties such as reduced rolling resistance, improved wet/snow traction and winter softness, improved dynamic stiffness, improved tensile strength, easy handling, and/or compatibility with higher environmental standard, among others.

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Fairlawn, OH, United States of America

Koji Masaki