Mizuno Corporation

Kenji Onoda

Masao Ogawa

Norikazu Ninomiya

Yuri Naka

Koji Sakai

Takeshi Naruo

Mototaka Iwata

Yoshihiro Fujikawa

Katsuyuki Aizawa

Yukihiro Teranishi

Takeshi Matsuzaki

Hsiu Hao Chuang

Kazuhiro Ohmori

Yukio Kawasima

Takatsugu Shimana

Naokazu Yuge

This invention is directed to A composition for forming a golf ball, the composition comprising polyurethane gel composite particles and at least one base material selected from the group consisting of synthetic resins and elastomers, the polyurethane gel composite particles consisting of colloidal polyurea particles precipitated from a non-aqueous solvent solution of colloidal polyurea and polyurethane gel particles covered with the polyurea particles, the polyurethane gel particles being three-dimensionally crosslinked and each of the polyurethane gel particles being formed of a polyisocyanate compound and a polyethylene oxide group-free, active-hydrogen-containing compound, at least one of the compounds being trifunctional or higher valency, and is also directed to a multi-piece golf ball having one or more layers formed of this composition.

Composition for producing golf balls and multi-piece golf balls

A multi-piece golf ball has a core, an interlayer, and a cover, the corehaving a spherical main partand a plurality of ribsprovided on the surface of the main part, the interlayerbeing inserted into depressions surrounded by the ribs, and the hardness of the interlayerbeing less than that of the core. The multi-piece golf ball can achieve an especially long carry distance.

Multi-piece golf ball and manufacturing method thereof

A multi-piece golf ball has a core (), an interlayer (), and a cover (), the core () being provided with a spherical main part () and a plurality of ribs () formed on the main part (), the interlayer () being accommodated in depressions () surrounded by the ribs () and having a thickness substantially the same as the height of the ribs (), each of the ribs () extending in such a manner that the width thereof becomes greater from the cover towards the core, each of the depressions () being formed into a cone-like shape by side faces of the ribs (), and the hardness of the interlayer () being less than that of the core (). This structure achieves satisfactory soft feeling and high bounce resilience.

The present invention relates to a high-strength golf ball comprising a core having a main core and optionally a sub-core comprising one or more layers, and a cover having one or more layers; and to a high-strength golf ball comprising a core having a main core and optionally a sub-core comprising one or more layers, an interlayer having one or more layers, and a cover having one or more layers; wherein at least one of the portions contains at least one member selected from the group consisting of carbon nanotubes and fullerenes.

High-strength golf ball

A golf ball comprising a core (), intermediate layer (), and cover (), wherein the intermediate layer () is provided with a plurality of apertures through which the core () is exposed, wherein the outer surface of the intermediate layer () and the surface of the core () exposed through the apertures are on substantially the same spherical surface, and wherein the hardness of the intermediate layer () is greater than that of the core (). The golf ball achieves both a high ball resilience and a soft impact feel.

Golf ball and mold for manufacturing core thereof

The present invention provides a multi-piece golf ball comprising a core, a first intermediate layer, a second intermediate layer, and a cover, wherein the first intermediate layercomprises a plurality of ribsformed on the core; the second intermediate layeris placed in concave portions surrounded by the ribs; and the coverforms an outermost layer; with each of the ribs extending so that its width increases from the cover side to the core side; the concave portions being shaped into a funnel-like form by the side surfaces of the ribs; the hardness of the core, the first intermediate layerand the second intermediate layerbeing different from each other; and the hardness of the first intermediate layerbeing greater than that of the second intermediate layer

Multi-piece golf ball, manufacturing method thereof and mold for manufacturing the same

This invention relates to a multi-layered, multi-piece golf ball that comprises a core, an intermediate layer, and a cover, wherein the core comprises a spherical body and ribs that are arranged on the surface of the spherical body and that have almost the same height as the thickness of the intermediate layer, wherein the intermediate layer fills a plurality of concave portions formed on the surface of the spherical body while being surrounded by the ribs. This arrangement enables the golf ball to have both high ball bounce resilience and a soft feel when hit.

The present invention intends to prevent deviation and gap from being generated in a joining section of a golf club in which a head main bodyA and a surface materialB are integrated by joining together and provide a high quality golf club head having an improved durability and manufacturing method thereof. In the golf club head in which the head main bodyA and the surface materialB are joined together such that they are integral, a grooveis provided in a joining section between the both members and joint materialcomposed of fiber reinforced resin material is embedded in that groove. Consequently, the joining strength is intensified.

Golf club head and manufacturing method thereof

A golf ball comprising a spherical core () and a cover () covering the spherical core (), wherein the core () is provided with grooves () along three great circles drawn on the surface of the core () so as to intersect each other at right angles, and projections () engaging in the grooves () are provided on the inner surface of the cover (). A golf ball with such a structure has both high resilience and soft feel when hit.

Golf ball and method of manufacturing the same

The inventive golf club comprises a head of a metal having a face and a flexural range, defined in the face, where the quantity of flexure in a direction perpendicular to the face is at least 45% of the maximum quantity of vertical flexure of the face. The flexural range is arranged in coincidence with a hitting spot distribution range of a player in the face. Alternatively, a flexural range having a spring constant of at least 2 kN/mm and not more than 4 kN/mm is present in the face of the inventive golf club.

Golf club

A midsole assembly for an athletic shoe in which a corrugated sheet is integrally arranged in the midsole thereof. The corrugated sheet provides a proper stiffness of the midsole made of rubber or expandable synthetic resin as well as a proper cushioning property thereof and therefore provides a comfortable feeling when worn, best suited to each athletic activity.

Growing community of inventors

Kashihara, Japan

Kenji Onoda