Bridgestone Corporation

Bridgestone Sports Co., Ltd.

Teppei Mori

Tsuyoshi Nakajima

Yuichiro Ozawa

Yusuke Yamagata

Takahiro Iwai

Takashi Ohira

Hideo Takeichi

Satoru Tamaki

Masafumi Daifuku

Kei Tsuchiya

Hideyuki Kaneda

Kanae Fujikake

A tire state management system () is provided with an image data acquisition unit () for acquiring 1st image data acquired by imaging the outer surface at a first timing and second image data acquired by imaging the outer surface at a second timing later than the first timing, a damage portion acquisition unit () for acquiring a damage included in the 1st image data and a damage included in the 2nd image data, a vehicle operation information acquisition unit () for acquiring operation information of a vehicle on which a tire is mounted, and a maintenance prediction unit () for estimating a progress speed based on the damage included in the 1st image data and the progress speed included in the 2nd image data and predicting a maintenance timing for the tire based on the progress speed and the operation information.

Tire state management system and tire state management program

A tire state estimation system () is provided with a crack shape acquisition unit () for acquiring the shape of a crack on the outer surface of a tire, a crack information DB () for holding a correspondence relationship in which at least either degree of opening or deviation width of the crack based on the shape of the crack is associated with the depth of the crack, and a crack depth estimation unit () for estimating the depth of the crack based on the acquired crack shape and the correspondence relationship.

Tire state estimation system and tire state estimation program

A tire damage detection system () is provided with an image data acquisition unit () which acquires image data including a rim wheel and a tire side part of a tire assembled to the rim wheel, a rim information acquisition unit () which acquires rim information including a radial size of the rim wheel associated with the tire, an damage detection unit () which detects an damage portion of the tire side part on the basis of the image data and detects a size of the damage portion with reference to a diameter of the rim wheel based on the rim information, and an output unit () which outputs information on the damage portion detected by the damage detection unit ().

Tire damage detection system and tire damage detection program

A golf ball having a good rebound and excellent flight performance can be obtained using a golf ball composition which contains a diene polymer having an aluminum catalyst residue content of not more than 650 ppm.

Golf ball composition and golf ball

A golf ball having a good rebound and excellent flight performance can be obtained using a golf ball composition which includes a diene polymer containing not more than 1.5% of components having a molecular weight of 30,000 or less.

A golf ball having a good rebound and excellent flight performance can be obtained using a golf ball composition which includes a diene polymer having a molecular weight distribution (Mw/Mn) of less than 1.9.

A golf ball endowed with a good rebound and an excellent flight performance can be obtained using a golf ball composition of good workability which contains a diene polymer having a peak top molecular weight (Mp) on a molecular weight distribution curve measured using gel permeation chromatography (GPC) of at least 40&#xd7;10and not more than 100&#xd7;10.

A golf ball having a good rebound and excellent flight performance can be obtained using a golf ball composition which contains a diene polymer having a smallest molecular weight value of at least 3,000.

The invention provides a rubber composition for golf balls which includes (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %, (B) an unsaturated carboxylic acid and/or a metal salt thereof, and (C) a benzimidazole of general formula (1) or (2) below wherein R is a hydrogen atom or a hydrocarbon group of 1 to 20 carbons, and m is an integer from 1 to 4, with the proviso that if m is 2 or more, each occurrence of R may be the same or different. The golf ball rubber composition of the invention enables a high-quality molded and crosslinked product having a suitable hardness and a high resilience to be obtained.

Rubber composition for golf ball

The invention provides a rubber composition for golf balls which includes (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %, (B) an unsaturated carboxylic acid and/or a metal salt thereof, and (C) a diphenylamine of the general formula wherein Rand Rare each independently a hydrogen atom or a hydrocarbon group of 1 to 20 carbons, m is an integer from 1 to 5, and n is an integer from 1 to 4, with the proviso that if m and/or n is 2 or more, each occurrence of Rand Rmay be the same or different. The golf ball rubber composition of the invention enables a high-quality molded and crosslinked product having a suitable hardness and a high resilience to be obtained.

The invention provides a rubber composition for golf balls which includes: (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %; (B) an unsaturated carboxylic acid and/or a metal salt thereof; (C) an anthranilic acid derivative of the general formula wherein Rand Rare each independently a hydrogen atom or a hydrocarbon group of 1 to 20 carbons, m is an integer from 1 to 4, and n is an integer from 1 to 3, with the proviso that if m and/or n is 2 or more, each occurrence of Rand Rmay be the same or different; and (D) sulfur. The rubber composition for golf balls of the invention enables a high-quality molded and crosslinked product having a suitable hardness and a high resilience to be obtained.

Rubber composition for golf balls which includes: (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %; (B) an unsaturated carboxylic acid and/or a metal salt thereof; (C) an anthranilic acid derivative of the general formula wherein Rand Rare each independently a hydrogen atom or a hydrocarbon group of 1 to 20 carbons, m is an integer from 1 to 4, and n is an integer from 1 to 3, with the proviso that if m and/or n is 2 or more, each occurrence of Rand Rmay be the same or different; and (D) an organic peroxide having a one-minute half-life temperature which is at least 158&#xb0; C. and less than 175&#xb0; C. The rubber composition for golf balls of the invention enables a high-quality molded and crosslinked product having a suitable hardness and a high resilience to be obtained.

The invention provides a rubber composition for golf balls which includes (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %, (B) an unsaturated carboxylic acid and/or a metal salt thereof, and (C) a thiourea of the general formula wherein R is independently at each occurrence a hydrogen atom or a hydrocarbon group of 1 to 20 carbons. The golf ball rubber composition of the invention enables a high-quality molded and crosslinked product having a suitable hardness and a high resilience to be obtained.

The invention provides a rubber composition for golf balls which includes (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %, (B) an unsaturated carboxylic acid and/or a metal salt thereof, and (C) an anthranilic acid derivative of the general formula wherein Rand Rare each independently a hydrogen atom or a hydrocarbon group of 1 to 20 carbons, m is an integer from 1 to 4, and n is an integer from 1 to 3, with the proviso that if m and/or n is 2 or more, each occurrence of Rand Rmay be the same or different. The golf ball rubber composition of the invention enables a high-quality molded and crosslinked product having a suitable hardness and a high resilience to be obtained.

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Kodaira, Japan

Teppei Mori