Otsuka Chemical Co., Ltd.

Bridgestone Corporation

Noriaki Shiina

Mifuyu Ueno

Takashi Sato

Masaki Abe

Shinya Nakashima

Kazuhiro Kodama

Aya Saiki

Hidehiro Minashima

Yuzaburo Yano

Noriaki Yukimura

Hiroaki Yuasa

Takahiro Yoshizawa

Hiroyuki Ishitobi

Eriko Sato

Kazuki Tsubokura

Crystals of 3-hydroxy-N'-(1,3-dimethylbutylidene)-2-naphthoic acid hydrazide having an X-ray powder diffraction pattern comprising a peak of maximum intensity at an angle of diffraction (2θ) of 6.9±0.2°, 11.4±0.2° and/or 25.2±0.2°. The crystals are useful as rubber additives in tires.

Crystals of 3-hydroxy-N'-(1,3-dimethylbutylidene)-2-naphthoic acid hydrazide and production method for the same

An object of the present invention is to provide novel crystals. Provided are crystals of 3-hydroxy-N'-(1,3-dimethylbutylidene)-2-naphthoic acid hydrazide having an X-ray powder diffraction pattern comprising a peak of maximum intensity at an angle of diffraction (2θ) of 6.1±0.2°.

Crystals and production method for the same

Provided is a rubber composition that contains at least one rubber component selected from natural rubber and diene-based synthetic rubbers and, blended therewith, at least one bisanilino compound represented by formula (I). In formula (I), Rand Reach represent, independently of one another, a hydrogen atom or an alkyl group having a carbon number of 1-6, m and n each represent an integer of 0 or 1, Arepresents an alkylene group having a carbon number of 1-7, Arepresents an alkylene group having a carbon number of 1-8, Xrepresents an oxygen atom, a sulfur atom, or an &#x2014;NR&#x2014; group, and Xrepresents an oxygen atom, a sulfur atom, or an &#x2014;NR&#x2014; group, where Rand Reach represent a hydrogen atom or an alkyl group having a carbon number of 1-4, or collectively form an alkylene group having a carbon number of 1-4. 

Rubber composition, tire, bisanilino compound, and anti-aging agent

Provided is a rubber composition that has better weather resistance than conventional rubber compositions and can inhibit surface discoloration of a rubber article. The rubber composition contains at least one rubber component selected from natural rubber and diene-based synthetic rubbers and, blended therewith, at least one amine compound represented by formula (I) shown below. In formula (I), Rand Reach represent, independently of one another, an alkyl group having a carbon number of 1-10, an aralkyl group, or a phenyl group, and A represents an alkylene group having a carbon number of 6-30 that may include an interposed phenylene group. 

Rubber composition, tire, amine compound, and anti-aging agent

The invention provides a rubber composition prepared by mixing, per 100 parts by mass of a rubber component comprising at least 50% by mass of a diene-based rubber, from 20 to 150 parts by mass of a filler, and from 0.05 to 30 parts by mass of a compound A which has a specific guanidine structure and has a functional group reactive with the diene-based rubber. The rubber composition improves both a high elastic modulus and a low tan &#x3b4;. The invention also provides a pneumatic tire using the rubber composition.

Rubber composition, and pneumatic tire using same

Provided is a rubber composition that has better weather resistance than conventional rubber compositions and can inhibit rubber article surface discoloration. The rubber composition contains at least one rubber component selected from natural rubber and diene-based synthetic rubbers and, blended therewith, at least one bisphenyldiamine compound represented by formula (I). In formula (I), R, R, R, and Reach represent, independently of one another, a hydrogen atom, an alkyl group having a carbon number of 1-10, or a phenyl group, but Rand Rdo not both simultaneously represent a hydrogen atom and Rand Rdo not both simultaneously represent a hydrogen atom, Rand Reach represent, independently of one another, an alkyl group having a carbon number of 1-8 or an aralkyl group, A represents an alkylene group having a carbon number of 1-12, and l, m, and n each represent an integer of 0 or 1. 

Rubber composition, tire, bisphenyldiamine compound, and anti-aging agent

The invention provides a rubber composition prepared by mixing, per 100 parts by mass of the rubber component comprising at least 50% by mass of a diene-based rubber, from 20 to 150 parts by mass of a filler, and from 0.05 to 30 parts by mass of a compound A which has a specific amidine structure and has a functional group reactive with the diene-based rubber. The rubber composition improves both a high elastic modulus and a low tan &#x3b4;. The invention also provides a pneumatic tire using the rubber composition.

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Osaka, Japan

Noriaki Shiina