US20110159998A1 - Golf ball - Google Patents

Golf ball Download PDF

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Publication number
US20110159998A1
US20110159998A1 US12/938,501 US93850110A US2011159998A1 US 20110159998 A1 US20110159998 A1 US 20110159998A1 US 93850110 A US93850110 A US 93850110A US 2011159998 A1 US2011159998 A1 US 2011159998A1
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United States
Prior art keywords
hardness
golf ball
less
core
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/938,501
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English (en)
Inventor
Keiji Ohama
Takahiro Sajima
Yoshiko Matsuyama
Hirotaka Nakamura
Toshiyuki Tarao
Kazuyoshi Shiga
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dunlop Sports Co Ltd
Original Assignee
SRI Sports Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SRI Sports Ltd filed Critical SRI Sports Ltd
Assigned to SRI SPORTS LIMITED reassignment SRI SPORTS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MATSUYAMA, YOSHIKO, NAKAMURA, HIROTAKA, OHAMA, KEIJI, SAJIMA, TAKAHIRO, SHIGA, KAZUYOSHI, TARAO, TOSHIYUKI
Publication of US20110159998A1 publication Critical patent/US20110159998A1/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/005—Cores
    • A63B37/006—Physical properties
    • A63B37/0062—Hardness
    • A63B37/0063—Hardness gradient
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/005—Cores
    • A63B37/006—Physical properties
    • A63B37/0062—Hardness
    • A63B37/00621—Centre hardness
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/005—Cores
    • A63B37/006—Physical properties
    • A63B37/0062—Hardness
    • A63B37/00622—Surface hardness
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/007—Characteristics of the ball as a whole
    • A63B37/0072—Characteristics of the ball as a whole with a specified number of layers
    • A63B37/0076—Multi-piece balls, i.e. having two or more intermediate layers
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/007—Characteristics of the ball as a whole
    • A63B37/0077—Physical properties
    • A63B37/0092—Hardness distribution amongst different ball layers
    • A63B37/00922—Hardness distribution amongst different ball layers whereby hardness of the cover is lower than hardness of the intermediate layers
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0023—Covers
    • A63B37/0029—Physical properties
    • A63B37/0031—Hardness
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0023—Covers
    • A63B37/0029—Physical properties
    • A63B37/0033—Thickness
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0038—Intermediate layers, e.g. inner cover, outer core, mantle
    • A63B37/004—Physical properties
    • A63B37/0043—Hardness
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0038—Intermediate layers, e.g. inner cover, outer core, mantle
    • A63B37/004—Physical properties
    • A63B37/0045—Thickness
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/005—Cores
    • A63B37/006—Physical properties
    • A63B37/0064—Diameter

Definitions

  • the present invention relates to golf balls. More particularly, the present invention relates to multi-piece golf balls having a core, a mid layer and a cover.
  • an appropriate trajectory height is required.
  • the trajectory height varies depending on the spin rate and launch angle. Golf balls which achieve a high trajectory due to a high spin rate are accompanied by insufficient flight distance. Golf balls which achieve a high trajectory due to a great launch angle can attain a great flight distance.
  • a core having an outer-hard/inner-soft structure By employing a core having an outer-hard/inner-soft structure, a low spin rate and a great launch angle can be both achieved.
  • This core is composed of a center and an outer core layer.
  • the cover is composed of an inner cover layer and an outer cover layer.
  • Japanese Unexamined Patent Application, Publication No. 2003-205052 (equivalent to US 2003/0166422) discloses a golf ball having a center, a mid layer and a cover.
  • Japanese Unexamined Patent Application, Publication No. 2004-130072 (equivalent to US 2004/0029648) discloses a golf ball having a core and a cover. This core has a three-layer structure.
  • An object of the present invention is to provide a golf ball that can attain a great flight distance upon hitting with a driver, and that is excellent in a control performance achieved upon hitting with a short iron.
  • the golf ball according to one aspect of the present invention has a core, a mid layer situated on the external side of the core, and a cover situated on the external side of the mid layer.
  • the proportion of the volume of the core relative to the volume of a phantom sphere of the golf ball is no less than 76%.
  • the difference (He ⁇ Ho) between the JIS-C hardness He of the surface of the core and the JIS-C hardness Ho of the central point of the core is 20 or greater and 40 or less.
  • the JIS-C hardness Hc of the cover is less than the hardness Ho.
  • H 1 represents the JIS-C hardness at a point P 1 that is located inside the point P along the radial direction and away from the point P at a distance of 1 mm
  • H 2 represents the JIS-C hardness at a point P 2 that is located outside the point P along the radial direction and away from the point P at a distance of 1 mm.
  • the core has an appropriate hardness distribution.
  • This core is accompanied by less energy loss upon hitting with a driver. According to this golf ball, a great flight distance is attained upon hitting with a driver.
  • This golf ball is excellent in a control performance achieved upon hitting with a short iron.
  • a principal component of the base material of the cover is a thermoplastic polyurethane.
  • the polyol component of this thermoplastic polyurethane is a polytetramethylene ether glycol having a number average molecular weight of no greater than 1,500.
  • the hardness Hm is greater than the hardness He.
  • the hardness He is 70 or greater and 95 or less.
  • the hardness Ho is 40 or greater and 80 or less.
  • the difference (Ho ⁇ Hc) between the hardness Ho and the hardness Hc is 3 or greater and 15 or less.
  • the core may have a center and an envelope layer situated on the external side of the center.
  • the center has a diameter of preferably 10 mm or greater and 20 mm or less
  • the envelope layer has a thickness of preferably mm or greater and 18 mm or less.
  • the hardness He is greater than the surface hardness of the center.
  • the difference (He ⁇ Hi) between the hardness He and the hardness Hi of the innermost point of the envelope layer is 10 or greater and 25 or less.
  • FIG. 2 shows a graph illustrating a hardness distribution of the core of a golf ball according to Example 1 of the present invention
  • FIG. 3 shows a graph illustrating a hardness distribution of the core of a golf ball according to Example 2 of the present invention
  • FIG. 5 shows a graph illustrating a hardness distribution of the core of a golf ball according to Comparative Example 1;
  • FIG. 6 shows a graph illustrating a hardness distribution of the core of a golf ball according to Comparative Example 2.
  • FIG. 7 shows a graph illustrating a hardness distribution of the core of a golf ball according to Comparative Example 3.
  • This golf ball 2 has a diameter of from 40 mm to 45 mm. From the standpoint of conformity to a rule defined by the United States Golf Association (USGA), the diameter is preferably no less than 42.67 mm. In light of suppression of the air resistance, the diameter is preferably no greater than 44 mm, and more preferably no greater than 42.80 mm.
  • the weight of this golf ball 2 is 40 g or greater and 50 g or less. In light of attainment of great inertia, the weight is preferably no less than 44 g, and more preferably no less than 45.00 g. From the standpoint of conformity to a rule defined by the USGA, the weight is preferably no greater than 45.93 g.
  • the amount of the co-crosslinking agent is preferably no less than 5 parts by weight, and particularly preferably no less than 10 parts by weight relative to 100 parts by weight of the base rubber. In light of soft feel at impact, the amount of the co-crosslinking agent is preferably no greater than 30 parts by weight, and more preferably no greater than 25 parts by weight, and particularly preferably no greater than 20 parts by weight relative to 100 parts by weight of the base rubber.
  • the amount of the organic peroxide is preferably no less than 0.1 part by weight, more preferably no less than 0.2 part by weight, and particularly preferably no less than 0.3 part by weight relative to 100 parts by weight of the base rubber. In light of soft feel at impact, the amount of the organic peroxide is preferably no greater than 1.5 parts by weight, more preferably no greater than 1.0 part by weight, and particularly preferably no greater than 0.8 part by weight relative to 100 parts by weight of the base rubber.
  • the amount of the organic sulfur compound is preferably no less than 0.1 part by weight, and more preferably no less than 0.2 part by weight relative to 100 parts by weight of the base rubber. In light of soft feel at impact, the amount of the organic sulfur compound is preferably no greater than 1.5 parts by weight, more preferably no greater than 1.0 part by weight, and particularly preferably no greater than 0.8 part by weight relative to 100 parts by weight of the base rubber.
  • An anti-aging agent, a coloring agent, a plasticizer, a dispersant, sulfur, a vulcanization accelerator and the like may be added to the rubber composition for use in the center 10 as needed.
  • this rubber composition may be also dispersed crosslinked rubber powders or synthetic resin powders.
  • the center 10 is covered by two pieces of uncrosslinked or partially crosslinked half shell.
  • the half shells are compressed and heated. The heating causes a crosslinking reaction, thereby completing an envelope layer 12 .
  • the crosslinking temperature is usually 140° C. or higher and 180° C. or lower.
  • the crosslinking time period of the envelope layer 12 is usually 10 minutes or longer and 60 minutes or shorter.
  • the hardness Hi is measured on a hemisphere obtained by cutting the core 4 .
  • a JIS-C type hardness scale By pushing a JIS-C type hardness scale on a section of the hemisphere, the hardness Hi is measured.
  • the hardness scale is pushed on a region sandwiched between a first circle and a second circle.
  • the first circle corresponds to a boundary between the center and the envelope layer 12 .
  • the second circle is concentric with the first circle and has a radius greater than the first circle by 1 mm.
  • an automated rubber hardness tester (“P1”, trade name, available from Kobunshi Keiki Co., Ltd.) equipped with this hardness scale is used.
  • the cover 8 including a polyurethane absorbs impact. This absorption leads to a soft feel at impact achieved. In particular, when hit with a short iron or a putter, the cover 8 leads to an excellent feel at impact achieved.
  • the polyurethane and other resin may be used in combination.
  • the polyurethane is included as a principal component of the base polymer in light of the spin performance and the feel at impact.
  • the percentage of the amount of the polyurethane relative to the total amount of the base polymer is preferably no less than 50% by weight, more preferably no less than 70% by weight, and particularly preferably no less than 85% by weight.
  • the polyurethane contains a polyol component.
  • a polymer polyol is preferred.
  • the polymer polyol include: polyether polyols such as polyoxyethylene glycol (PEG), polyoxypropylene glycol (PPG) and polytetramethylene ether glycol (PTMG); condensed polyester polyols such as polyethylene adipate (PEA), polybutylene adipate (PBA) and polyhexamethylene adipate (PHMA); lactone based polyester polyols such as poly- ⁇ -caprolactone (PCL); polycarbonate polyols such as polyhexamethylene carbonate; and acrylic polyols. Two or more kinds of the polyol may be used in combination.
  • a polytetramethylene ether glycol is preferred.
  • a spin rate attained upon hitting of the golf ball 2 with a short iron has a great correlation with the content of the polytetramethylene ether glycol.
  • a spin rate attained upon hitting of the golf ball 2 with a driver has a less correlation with the content of the polytetramethylene ether glycol.
  • the golf ball 2 in which the polyurethane contains an appropriate amount of a polytetramethylene ether glycol is excellent in both terms of the flight performance achieved upon hitting with a driver, and the control performance achieved upon hitting with a short iron.
  • the number average molecular weight is measured with a gel permeation chromatography.
  • the measurement conditions are as in the following.
  • Amount of sample 5 microliter
  • the polyurethane may contain a chain extender as a component thereof.
  • a chain extender include low molecular weight polyols and low molecular weight polyamines.
  • the low molecular weight polyamines are exemplified by aliphatic polyamines, monocyclic aromatic polyamines and polycyclic aromatic polyamines.
  • Specific examples of the aliphatic polyamine include ethylene diamine, propylene diamine, butylene diamine and hexamethylene diamine.
  • Specific examples of the monocyclic aromatic polyamine include phenylene diamine, toluene diamine, dimethyltoluene diamine, dimethylthiotoluene diamine and xylylene diamine.
  • the cover 8 may be molded from a composition containing a thermoplastic polyurethane and an isocyanate compound. During or following molding of the cover 8 , the polyurethane is crosslinked by this isocyanate compound.
  • a coloring agent such as titanium dioxide
  • a filler such as barium sulfate, a dispersant, an antioxidant, an ultraviolet absorbent, a light stabilizer, a fluorescent agent, a fluorescent brightening agent and the like in an appropriate amount as needed.
  • the hardness Hc of the cover 8 is less than the central hardness Ho of the core 4 .
  • This golf ball 2 is excellent in the control performance achieved upon shots with a short iron.
  • the difference (Ho ⁇ Hc) is preferably no less than 3, more preferably no less than 5, and particularly preferably no less than 8.
  • the difference (Ho ⁇ Hc) is preferably no greater than 15.
  • the cover 8 has a thickness of preferably no greater than 0.8 mm, more preferably no greater than 0.6 mm, still more preferably no greater than 0.5 mm, and particularly preferably no greater than 0.4 mm. In light of the control performance achieved upon shots with a short iron, the thickness is preferably no less than 0.10 mm, and particularly preferably no less than 0.15 mm.
  • Dimples 14 are formed by way of pimples formed on the cavity face of the mold when the cover 8 is molded.
  • the amount of compressive deformation Db of the golf ball 2 is preferably no less than 2.3 mm, more preferably no less than 2.4 mm, and particularly preferably no less than 2.5 mm.
  • the deformation Db is preferably no greater than 3.5 mm, more preferably no greater than 3.2 mm, and particularly preferably no greater than 3.0 mm.
  • the golf ball 2 Upon measurement of the deformation Db, the golf ball 2 is placed on a hard plate made of metal. A cylinder made of metal gradually descends toward this golf ball 2 . The golf ball 2 interposed between the bottom face of the cylinder and the hard plate is deformed. A migration distance of the cylinder, starting from the state in which an initial load of 98 N is applied to the golf ball 2 up to the state in which a final load of 1,274 N is applied thereto is measured.
  • the golf ball 2 may have a reinforcing layer between the mid layer 6 and the cover 8 .
  • the reinforcing layer firmly adheres to the mid layer 6 , and firmly adheres also to the cover 8 . Due to the reinforcing layer, detachment of the cover 8 from the mid layer 6 can be suppressed. As described above, this golf ball 2 has thin cover 8 . When a golf ball which has a thin cover is hit with an edge of a clubface, a wrinkle is liable to be generated. The reinforcing layer suppresses generation of such a wrinkle.
  • a two-component cured thermosetting resin may be suitably used for the base polymer of the reinforcing layer.
  • the two-component cured thermosetting resin include epoxy resins, urethane resins, acrylic resins, polyester based resins and cellulose based resins.
  • two-component cured epoxy resins and two-component cured urethane resins are preferred.
  • the reinforcing layer may include additives such as a coloring agent (typically, titanium dioxide), a phosphate based stabilizer, an antioxidant, a light stabilizer, a fluorescent brightening agent, an ultraviolet absorbent, a blocking preventive agent and the like.
  • a coloring agent typically, titanium dioxide
  • a phosphate based stabilizer typically, an antioxidant
  • a light stabilizer typically, a fluorescent brightening agent
  • an ultraviolet absorbent typically, titanium dioxide
  • the additive may be added either to the base material of the two-component cured thermosetting resin, or to the curing agent of the two-component cured thermosetting resin.
  • the reinforcing layer is obtained by coating a liquid, which had been prepared by dissolving or dispersing a base material and a curing agent in a solvent, on the surface of the mid layer 6 .
  • a liquid which had been prepared by dissolving or dispersing a base material and a curing agent in a solvent
  • coating with a spray gun is preferred.
  • the solvent is volatilized after the coating to permit a reaction of the base material with the curing agent, thereby forming the reinforcing layer.
  • the reinforcing layer has a thickness of preferably no less than 3 ⁇ m, and more preferably no less than 5 ⁇ m.
  • the thickness is preferably no greater than 300 ⁇ m, more preferably no greater than 50 ⁇ m, and particularly preferably no greater than 20 ⁇ m. The thickness is measured by observation of the cross section of the golf ball 2 with a microscope. When the surface of the mid layer 6 has roughness resulting from a surface roughening treatment, the thickness is measured immediately above the protruded portion.
  • the reinforcing layer has a pencil hardness of preferably no less than 4 B, and more preferably no less than B.
  • the reinforcing layer In light of less loss of the force during transfer from the cover 8 to the mid layer 6 upon hitting of the golf ball 2 , the reinforcing layer has a pencil hardness of preferably no greater than 3 H. The pencil hardness is measured in accordance with a standard of “JIS K5400”.
  • a rubber composition (1) was obtained by kneading 100 parts by weight of a high-cis polybutadiene (“BR-730”, trade name, available from JSR Corporation), 20 parts by weight of zinc diacrylate, 5 parts by weight of zinc oxide, an adequate amount of barium sulfate, 0.5 part by weight of diphenyl disulfide and 0.7 part by weight of dicumyl peroxide.
  • This rubber composition (1) was placed into a mold having upper and lower mold half each having a hemispherical cavity, and heated at a temperature of 170° C. for 15 minutes to obtain a center having a diameter of 15 mm.
  • a rubber composition (4) was obtained by kneading 100 parts by weight of a high-cis polybutadiene (“BR-730”, supra), 35 parts by weight of zinc diacrylate, 5 parts by weight of zinc oxide, an adequate amount of barium sulfate, 0.5 part by weight of diphenyl disulfide and 0.7 part by weight of dicumyl peroxide.
  • Half shells were formed from this rubber composition (4). The aforementioned center was covered by two pieces of the half shell. The center and the half shells were placed into a mold having upper and lower mold half each having a hemispherical cavity, and heated at a temperature of 170° C. for 20 min to obtain a core having a diameter of 39.7 mm.
  • An envelope layer was formed from the rubber composition (4). The amount of barium sulfate was adjusted such that the envelope layer has a specific gravity identical to the specific gravity of the center, and the ball has a weight of 45.4 g.
  • a paint composition containing a two-component cured epoxy resin as a base polymer (“POLIN 750LE”, trade name, available from Shinto Paint Co., Ltd.) was prepared.
  • the base material liquid of this paint composition consists of 30 parts by weight of a bisphenol A type solid epoxy resin and 70 parts by weight of a solvent.
  • the curing agent liquid of this paint composition consists of 40 parts by weight of denatured polyamide amine, 55 parts by weight of a solvent and 5 parts by weight of titanium dioxide.
  • the weight ratio of the base material liquid and the curing agent liquid was 1/1.
  • This paint composition was coated on the surface of the mid layer with a spray gun, and kept in an atmosphere of 40° C. for 24 hrs to give a reinforcing layer. This reinforcing layer had a thickness of 10 ⁇ m.
  • a resin composition (b) was obtained by kneading 100 parts by weight of a thermoplastic polyurethane elastomer (“Elastollan® XNY85A”, trade name, available from BASF Japan Ltd.) and 4 parts by weight of titanium dioxide in a biaxial kneading extruder.
  • Half shells were obtained from this resin composition (b) with compression molding.
  • a sphere composed of the core, the mid layer and the reinforcing layer was covered by two pieces of the half shell.
  • the sphere and half shells were placed into a final mold having upper and lower mold half each having a hemispherical cavity and being provided with a large number of pimples on the cavity face thereof.
  • a cover was obtained by compression molding.
  • Example 2 Golf balls of Examples 2 to 7, and Comparative Examples 1 to 4 were obtained in a similar manner to Example 1 except that specifications of the center, the envelope layer, the mid layer and the cover were as listed in Tables 3 to 5 below. Details of the rubber compositions of the core are presented in Table 1 below. Details of the resin compositions of the mid layer and the cover are presented in Table 2 below. The golf ball according to Comparative Example 1 does not have an envelope layer.
  • a driver with a titanium head (SRI Sports Limited, trade name “SRIXON W505”, shaft hardness: X, loft angle:) 8.5° was attached to a swing machine available from Golf Laboratory Co. Then the golf ball was hit under a condition to give the head speed of 50 m/sec. The ball speed and spin rate immediately after the hitting, and the distance from the launching point to the point where the ball stopped were measured. Mean values of the data obtained by measuring 12 times are shown in Tables 3 to 5 below.
  • a sand wedge (SW) was attached to a swing machine available from Golf Laboratory Co. Then the golf ball was hit under a condition to give the head speed of 21 m/sec, and the spin rate immediately after the hitting was measured. Mean values of the data obtained by measuring 12 times are shown in Tables 3 to 5 below.
  • the golf balls were hit by ten golf players with a sand wedge, and an interview was conducted on the feel at impact. Based on the number of golf players who evaluated that “the feel at impact was favorable”, rating was performed according to the following criteria.
  • Polyol component polytetramethylene ether glycol
  • Polyol component polytetramethylene ether glycol
  • Polyol component polytetramethylene ether glycol
  • Polyol component polytetramethylene ether glycol
  • Polyol component polytetramethylene ether glycol
  • Example 6 Example 7 Center Composition (1) (1) (1) Cross- temperature 170° C. 170° C. 170° C. linking time (min) 15 15 15 Diameter (mm) 15 15 15 Envelope Composition (4) (4) (4) layer Cross- temperature 170° C. 170° C. 170° C. linking time (min) 20 20 20 Core Diameter (mm) 39.7 39.7 39.7 Volume proportion (%) 80.4 80.4 80.4 Hardness Ho (JIS-C) 60 60 60 Hardness He (JIS-C) 85 85 85 He-Ho 25 25 25 25 Hardness distribution FIG. 2 FIG. 2 FIG. 2 FIG.
  • the golf ball according to the present invention can be used for the play at the golf course, and the practice at the driving range.
  • the foregoing description is just for illustrative examples; therefore, various modifications can be made in the scope without departing from the principles of the present invention.
US12/938,501 2009-12-28 2010-11-03 Golf ball Abandoned US20110159998A1 (en)

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JP2009297651A JP4927934B2 (ja) 2009-12-28 2009-12-28 ゴルフボール
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US20130324320A1 (en) * 2012-06-01 2013-12-05 Dunlop Sports Co., Ltd. Golf ball
US20150119170A1 (en) * 2013-10-29 2015-04-30 Dunlop Sports Co. Ltd. Golf ball
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US20150182808A1 (en) * 2013-12-27 2015-07-02 Dunlop Sports Co. Ltd. Golf ball
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US9364720B2 (en) 2010-12-29 2016-06-14 Dunlop Sports Co. Ltd. Golf ball
US9409058B2 (en) 2010-12-29 2016-08-09 Dunlop Sports Co. Ltd. Golf ball
US20160228747A1 (en) * 2013-12-25 2016-08-11 Dunlop Sports Co. Ltd. Golf ball
US9415271B2 (en) 2014-06-24 2016-08-16 Bridgestone Sports Co., Ltd. Multi-piece solid golf ball
US9486673B2 (en) 2010-12-29 2016-11-08 Dunlop Sports Co. Ltd. Golf ball
US9873024B2 (en) 2012-05-01 2018-01-23 Bridgestone Sports Co., Ltd. Golf ball
US20180140904A1 (en) * 2015-04-27 2018-05-24 Dunlop Sports Co. Ltd. Golf ball
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