Sumitomo Rubber Industries Limited

Takanobu Kawamura

Kazuyoshi Shiga

Toshiyuki Tarao

Takahiro Shigemitsu

Mutsuki Sugimoto

Ryoji Kojima

Ayaka Shindo

Fusae Kaneko

Shinichiro Honda

Jun Okamoto

Shinya Nakano

Tomoko Konishi

An object of the present disclosure is to provide a golf ball having good shot feeling and excellent durability while having non-lowered resilience. The present disclosure provides a golf ball comprising a spherical core and one or more cover layers disposed outside the spherical core, wherein at least one layer of the cover layers contains (A) a base resin and (B) a polyethylene oxide.

Golf ball

An object of the present disclosure is to provide a golf ball having good shot feeling and excellent durability and not having lowered resilience even if a hard cover material is used. The present disclosure provides a golf ball comprising a spherical core, and a cover disposed outside the spherical core and composed of one or more layers, wherein at least one cover layer contains (A) a base resin, and (B) at least one member selected from the group consisting of a polyrotaxane, a polyethylene oxide, a polypropylene oxide, a polycaprolactone and a liquid polymer, and Sa×Spc≥100 wherein Sa (μm) is an arithmetic mean roughness of a surface of a cut plane of the cover, and Spc (mm) is an arithmetic mean curvature of a summit of the surface of the cut plane of the cover.

The present invention provides a method for estimating breaking energy of a rubber material, in particular breaking energy of a surface of a rubber material. The present invention also provides to a rubber composition excellent in crack resistance. The present invention relates to a method for estimating breaking energy of a rubber material, including determining a carbon-carbon double bond content in the rubber material.

Method for estimating breaking energy and rubber composition

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Kobe, Japan

Takanobu Kawamura