Patent application number | Description | Published |
20120277020 | PRACTICE GOLF BALL - A practice golf ball has a core and a cover. The core is made of a rubber composition which includes a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide. The base rubber is a mixture of polybutadiene with styrene-butadiene rubber and/or isoprene rubber, and the co-crosslinking agent is methacrylic acid. The core has a specific deflection under a specific load, and the ball has a specific initial velocity. The dimples on the surface of the ball have a volume ratio VR of from 0.95 to 1.7. | 11-01-2012 |
20120277021 | PRACTICE GOLF BALL - A practice golf ball has a core made of a rubber composition which includes a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide, and has a cover which encases the core and is made of a resin material. The co-crosslinking agent is methacrylic acid. The resin material has a breaking strength of 20 to 80 MPa and an elongation of 150 to 600%. The ball is endowed with the properties required of practice balls intended for long-term use, including better durability to cracking and durability of appearance than ordinary game balls, and also better durability to ball surface loss than the one-piece golf balls which are commonly used as practice balls. | 11-01-2012 |
20120277022 | PRACTICE GOLF BALL - A practice golf ball has a core and a cover. The core is made of a rubber composition which includes a base rubber, a co-crosslinking agent which is methacrylic acid, a crosslinking initiator and a metal oxide. The respective ingredients in the rubber composition are formulated in specific amounts, and the core has an optimized hardness profile. The cover is made of a resin component which is composed primarily of polyurethane. The cover has a thickness of 0.3 mm to 1.9 mm, and a material hardness, expressed as the Shore D hardness, of 30 to 57. The respective deflections of the core and the ball under a specific load, and the relationship therebetween, are optimized. | 11-01-2012 |
20120277023 | PRACTICE GOLF BALL - In a practice golf ball having a core and a cover encasing the core, the cover has a material hardness, expressed as the Shore D hardness, of from 30 to 57. The core has an initial velocity CV (m/s) and the ball has an initial velocity BV | 11-01-2012 |
20120277024 | PRACTICE GOLF BALL - A practice golf ball has a core and a cover. The core is made of a rubber composition which includes a base rubber, a co-crosslinking agent which is methacrylic acid, a crosslinking initiator and a metal oxide. The respective ingredients in the rubber composition are formulated in specific amounts, and the core has an optimized hardness profile. The cover includes a resin component which is composed primarily of polyurethane. The cover has a thickness of 0.3 mm to 1.9 mm, and a material hardness, expressed as the Shore D hardness, of 30 to 48. The respective deflections of the core and the ball under a specific load, and the relationship therebetween, are optimized. The volume ratio VR of dimples on the surface of the ball is optimized. | 11-01-2012 |
20120277025 | PRACTICE GOLF BALL - A practice golf ball with a core and a cover has, upon initial measurement, a deflection BH1 (mm) when compressed under a final load of 1,275 N from an initial load of 98 N and an initial velocity BV1 (m/s), and also has, when measured again after being left to stand for 350 days following initial measurement, a deflection BH2 (mm) when compressed under a final load of 1,275 N from an initial load of 98 N and an initial velocity BV2 (m/s), such that the difference BH2−BH1 is not more than 0.2 mm and the difference BV2−BV1 is not more than 0.3 m/s. The ball has excellent durability to cracking and durability of appearance, and also maintains a stable feel and flight performance over a long period of time. | 11-01-2012 |
20130095955 | SOLID GOLF BALL - The invention provides a solid golf ball having a core and a cover, the core being formed of a rubber composition containing a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide. The base rubber is a mixture of polybutadiene and a styrene-butadiene rubber, the styrene-butadiene rubber having a styrene bond content of not more than 35 wt %. The co-crosslinking agent is methacrylic acid. The core deflection under specific loading and the VR value for dimples on the ball surface are set within specific ranges. | 04-18-2013 |
20130108783 | GOLF BALL MANUFACTURING METHOD | 05-02-2013 |
20130109505 | GOLF BALL MANUFACTURING METHOD AND GOLF BALL | 05-02-2013 |
20130150181 | 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 having a molecular weight distribution (Mw/Mn) of less than 1.9. | 06-13-2013 |
20130150182 | 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. | 06-13-2013 |
20130150183 | GOLF BALL COMPOSITION AND GOLF BALL - 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 40×10 | 06-13-2013 |
20130150184 | 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 contains a diene polymer having a smallest molecular weight value of at least 3,000. | 06-13-2013 |
20130150185 | 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 contains a diene polymer having an aluminum catalyst residue content of not more than 650 ppm. | 06-13-2013 |
20130165268 | GOLF BALL MANUFACTURING METHOD AND GOLF BALL - A method of manufacturing golf balls having a solid core formed of a rubber composition and a cover of one or more layer encasing the core is disclosed. The method includes the steps of forming a solid core, treating a surface of the core with an aqueous solution containing a haloisocyanuric acid and/or a metal salt thereof, washing the surface of the surface-treated core, and covering the washed surface of the core with a cover material. The manufacturing method lowers the burden on the environment, and the golf balls thus obtained have a good feel when struck, a good scuff resistance and a high durability to impact. | 06-27-2013 |
20130172107 | SOLID GOLF BALL - The invention provides a solid golf ball having a core and a cover. The core is formed of a rubber composition containing a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide. The co-crosslinking agent is methacrylic acid, and the rubber composition includes a specific waste material in the form of a powder. The core deflection and the cover material are optimized. Utilizing a waste material in a solid golf ball conserves resources and thus is beneficial to the global environment. Even during prolonged use, the golf ball maintains its basic performance attributes (feel, flight, durability) at a high level. | 07-04-2013 |
20130172108 | SOLID GOLF BALL - The invention provides a solid golf ball having a core and a cover. The core is formed of a rubber composition containing a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide. The base rubber contains polybutadiene, a styrene-butadiene rubber and, optionally, an isoprene rubber. The co-crosslinking agent is methacrylic acid, and the rubber composition includes a specific waste material in the form of a powder. The core deflection and the cover material are optimized. Utilizing a waste material in a solid golf ball conserves resources and thus is beneficial to the global environment. Even during prolonged use, the golf ball maintains its basic performance attributes (feel, flight, durability) at a high level. | 07-04-2013 |
20140073461 | GOLF BALL - The invention provides a golf ball endowed with an improved distance and durability. The ball has a core and a cover, the core being formed of a rubber composition containing a base rubber, a co-crosslinking agent, a crosslinking initiator, a metal oxide and an organosulfur compound. The co-crosslinking agent is methacrylic acid, the metal oxide is zinc oxide, and the rubber composition contains the crosslinking initiator in an amount of from 1.2 to 5 parts by weight per 100 parts by weight of the base rubber. The finished ball has an initial velocity of at least 74.3 m/s. | 03-13-2014 |