EP3181199B1 - Balle de golf en deux parties - Google Patents

Balle de golf en deux parties Download PDF

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Publication number
EP3181199B1
EP3181199B1 EP16193917.8A EP16193917A EP3181199B1 EP 3181199 B1 EP3181199 B1 EP 3181199B1 EP 16193917 A EP16193917 A EP 16193917A EP 3181199 B1 EP3181199 B1 EP 3181199B1
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EP
European Patent Office
Prior art keywords
golf ball
equal
less
preferably equal
core
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EP16193917.8A
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German (de)
English (en)
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EP3181199A3 (fr
EP3181199A2 (fr
Inventor
Hironori Takihara
Takahiro Sajima
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Sumitomo Rubber Industries Ltd
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Sumitomo Rubber Industries Ltd
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Publication of EP3181199A2 publication Critical patent/EP3181199A2/fr
Publication of EP3181199A3 publication Critical patent/EP3181199A3/fr
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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
    • A63B37/007—Characteristics of the ball as a whole
    • A63B37/0077—Physical properties
    • A63B37/0088—Frequency
    • 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
    • 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
    • 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
    • A63B37/005—Cores
    • 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
    • A63B37/0051—Materials other than polybutadienes; Constructional details
    • 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
    • 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
    • A63B37/0061—Coefficient of restitution
    • 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
    • A63B37/0065—Deflection or compression
    • 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
    • A63B37/0074—Two piece balls, i.e. cover and core
    • 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
    • A63B37/008—Diameter
    • 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
    • A63B37/0083—Weight; Mass
    • 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
    • A63B37/0087—Deflection or compression
    • 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
    • A63B37/009—Coefficient of lift
    • 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
    • A63B37/0094—Rebound resilience
    • 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
    • A63B37/0096—Spin rate
    • 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
    • A63B37/02—Special cores
    • A63B37/06—Elastic cores
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/32—Golf

Definitions

  • the present invention relates to golf balls. Specifically, the present invention relates to so-called two-piece golf balls including a core and a cover.
  • golf balls are hit with a wood type club, an iron type club, a hybrid type club (utility), and a putter, etc.
  • Feel at impact upon hitting is of interest to golf players.
  • golf players desire golf balls having soft feel at impact.
  • thread-wound balls used to be mainstream golf balls. At present, thread-wound balls are almost not available commercially. In recent golf, two-piece balls, three-piece balls, four-piece balls, five-piece balls, six-piece balls, and the like are used.
  • a two-piece ball includes a core and a cover.
  • the structure of the two-piece ball is simple.
  • the two-piece ball can be manufactured at low cost. Proposals concerning two-piece balls are disclosed in JPH11-76461 (USP 6,123,629 ) and US Patent No. 5971870 .
  • Two-piece balls are suitable for beginners, since two-piece balls can be manufactured at low cost. As descried above, beginners prefer soft feel at impact upon putting. Improvement of feel at impact of two-piece balls upon putting is desired.
  • An object of the present invention is to provide a two-piece golf ball having excellent feel at impact upon putting.
  • a two-piece golf ball according to the present invention includes a core and a cover positioned outside the core.
  • a value V calculated by the following mathematical formula is equal to or less than 1080 Hz.
  • V NF 2 2 ⁇ 2 / 3 * NF 2 1
  • NF(2)1 represents a secondary natural frequency of the core
  • NF(2)2 represents a secondary natural frequency of the golf ball.
  • the two-piece golf ball according to the present invention has a simple structure.
  • the golf ball can be manufactured at low cost. Since the value V is equal to or less than 1080 Hz, the feel at impact of the golf ball upon putting is soft. The golf ball can achieve both a low price and desired feel at impact.
  • a difference (H1s-H1o) between a Shore C hardness H1s at a surface of the core and a Shore C hardness H1o at a central point of the core is equal to or greater than 10.
  • the value V is equal to or less than 1040 Hz. Further preferably, the value V is equal to or less than 1000 Hz.
  • an amount of compressive deformation Df1 of the core is equal to or greater than 4.1 mm.
  • an amount of compressive deformation Df2 of the two-piece golf ball is equal to or greater than 3.5 mm.
  • a thickness T2 of the cover is equal to or greater than 0.80 mm but equal to or less than 2.00 mm.
  • a Shore D hardness H2 of the cover is equal to or greater than 50 but equal to or less than 65.
  • a golf ball 2 shown in FIG. 1 includes a spherical core 4 and a cover 6 positioned outside the core 4. In the present embodiment, the cover 6 is joined directly to the core 4.
  • the golf ball 2 is a so-called two-piece ball.
  • the golf ball 2 has a plurality of dimples 8 on the surface thereof. Of the surface of the golf ball 2, a part other than the dimples 8 is a land 10.
  • the golf ball 2 includes a paint layer and a mark layer on the external side of the cover 6 although these layers are not shown in the drawing.
  • the golf ball 2 preferably has a diameter of equal to or greater than 40 mm but equal to or less than 45 mm. From the standpoint of conformity to the rules established by the United States Golf Association (USGA), the diameter is particularly preferably equal to or greater than 42.67 mm. In light of suppression of air resistance, the diameter is more preferably equal to or less than 44 mm and particularly preferably equal to or less than 42.80 mm.
  • the golf ball 2 preferably has a weight of equal to or greater than 40 g but equal to or less than 50 g. In light of attainment of great inertia, the weight is more preferably equal to or greater than 44 g and particularly preferably equal to or greater than 45.00 g. From the standpoint of conformity to the rules established by the USGA, the weight is particularly preferably equal to or less than 45.93 g.
  • the core 4 is formed by crosslinking a rubber composition.
  • base rubbers for use in the rubber composition include polybutadienes, polyisoprenes, styrene-butadiene copolymers, ethylenepropylene-diene copolymers, and natural rubbers. In light of resilience performance, polybutadienes are preferable.
  • polybutadiene and another rubber are used in combination, it is preferred if the polybutadiene is a principal component.
  • the proportion of the polybutadiene to the entire base rubber is preferably equal to or greater than 50% by weight and particularly preferably equal to or greater than 80% by weight.
  • a polybutadiene in which the proportion of cis-1,4 bonds is equal to or greater than 80% is particularly preferable.
  • the rubber composition of the core 4 preferably includes a co-crosslinking agent.
  • co-crosslinking agents in light of resilience performance of the golf ball 2 are monovalent or bivalent metal salts of an ⁇ , ⁇ -unsaturated carboxylic acid having 2 to 8 carbon atoms.
  • preferable co-crosslinking agents include zinc acrylate, magnesium acrylate, zinc methacrylate, and magnesium methacrylate. In light of resilience performance of the golf ball 2, zinc acrylate and zinc methacrylate are particularly preferable.
  • the rubber composition may include a metal oxide and an ⁇ , ⁇ -unsaturated carboxylic acid having 2 to 8 carbon atoms. They both react with each other in the rubber composition to obtain a salt.
  • the salt serves as a co-crosslinking agent.
  • preferable ⁇ , ⁇ -unsaturated carboxylic acids include acrylic acid and methacrylic acid.
  • preferable metal oxides include zinc oxide and magnesium oxide.
  • the amount of the co-crosslinking agent per 100 parts by weight of the base rubber is preferably equal to or greater than 10 parts by weight.
  • the golf ball 2 that includes the core 4 in which this amount is equal to or greater than 10 parts by weight has excellent resilience performance. In this respect, this amount is more preferably equal to or greater than 15 parts by weight and particularly preferably equal to or greater than 20 parts by weight.
  • the amount of the co-crosslinking agent per 100 parts by weight of the base rubber is preferably equal to or less than 40 parts by weight.
  • the golf ball 2 that includes the core 4 in which this amount is equal to or less than 40 parts by weight has soft feel at impact upon putting. In this respect, this amount is more preferably equal to or less than 35 parts by weight and particularly preferably equal to or less than 30 parts by weight.
  • the rubber composition of the core 4 includes an organic peroxide.
  • the organic peroxide serves as a crosslinking initiator.
  • the organic peroxide contributes to the resilience performance of the golf ball 2.
  • suitable organic peroxides include dicumyl peroxide, 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, and di-t-butyl peroxide.
  • An organic peroxide with particularly high versatility is dicumyl peroxide.
  • the amount of the organic peroxide per 100 parts by weight of the base rubber is preferably equal to or greater than 0.1 parts by weight.
  • the golf ball 2 that includes the core 4 in which this amount is equal to or greater than 0.1 parts by weight has excellent resilience performance. In this respect, this amount is more preferably equal to or greater than 0.3 parts by weight and particularly preferably equal to or greater than 0.5 parts by weight.
  • the amount of the organic peroxide per 100 parts by weight of the base rubber is preferably equal to or less than 3.0 parts by weight.
  • the golf ball 2 that includes the core 4 in which this amount is equal to or less than 3.0 parts by weight has soft feel at impact upon putting. In this respect, this amount is more preferably equal to or less than 2.5 parts by weight and particularly preferably equal to or less than 2.0 parts by weight.
  • the rubber composition of the core 4 includes an organic sulfur compound.
  • Organic sulfur compounds include naphthalenethiol compounds, benzenethiol compounds, and disulfide compounds.
  • naphthalenethiol compounds include 1-naphthalenethiol, 2-naphthalenethiol, 4-chloro-1-naphthalenethiol, 4-bromo-1-naphthalenethiol, 1-chloro-2-naphthalenethiol, 1-bromo-2-naphthalenethiol, 1-fluoro-2-naphthalenethiol, 1-cyano-2-naphthalenethiol, and 1-acetyl-2-naphthalenethiol.
  • benzenethiol compounds include benzenethiol, 4-chlorobenzenethiol, 3-chlorobenzenethiol, 4-bromobenzenethiol, 3-bromobenzenethiol, 4-fluorobenzenethiol, 4-iodobenzenethiol, 2,5-dichlorobenzenethiol, 3,5-dichlorobenzenethiol, 2,6-dichlorobenzenethiol, 2,5-dibromobenzenethiol, 3,5-dibromobenzenethiol, 2-chloro-5-bromobenzenethiol, 2,4,6-trichlorobenzenethiol, 2,3,4,5,6-pentachlorobenzenethiol, 2,3,4,5,6-pentafluorobenzenethiol, 4-cyanobenzenethiol, 2-cyanobenzenethiol, 4-nitrobenzenethiol, and 2-
  • disulfide compounds include diphenyl disulfide, bis(4-chlorophenyl)disulfide, bis(3-chlorophenyl)disulfide, bis(4-bromophenyl)disulfide, bis(3-bromophenyl)disulfide, bis(4-fluorophenyl)disulfide, bis(4-iodophenyl)disulfide, bis(4-cyanophenyl)disulfide, bis(2,5-dichlorophenyl)disulfide, bis(3,5-dichlorophenyl)disulfide, bis(2,6-dichlorophenyl)disulfide, bis(2,5-dibromophenyl)disulfide, bis(3,5-dibromophenyl)disulfide, bis(2-chloro-5-bromophenyl)disulfide, bis(
  • the amount of the organic sulfur compound per 100 parts by weight of the base rubber is preferably equal to or greater than 0.1 parts by weight and particularly preferably equal to or greater than 0.2 parts by weight. In light of feel at impact upon putting, the amount is preferably equal to or less than 1.5 parts by weight, more preferably equal to or less than 1.0 parts by weight, and particularly preferably equal to or less than 0.8 parts by weight. Two or more organic sulfur compounds may be used in combination.
  • the rubber composition of the core 4 may include a filler for the purpose of specific gravity adjustment and the like.
  • suitable fillers include zinc oxide, barium sulfate, calcium carbonate, and magnesium carbonate. The amount of the filler is determined as appropriate so that the intended specific gravity of the core 4 is accomplished.
  • the rubber composition may include various additives, such as sulfur, a carboxylic acid, a carboxylate, an anti-aging agent, a coloring agent, a plasticizer, a dispersant, and the like, in an adequate amount.
  • the rubber composition may include crosslinked rubber powder or synthetic resin powder.
  • the core 4 preferably has a diameter of equal to or greater than 39.0 mm.
  • the cover 6 is thin. Therefore, with the golf ball 2, the feel at impact upon putting is soft. Furthermore, the golf ball 2 has excellent resilience performance.
  • the diameter is more preferably equal to or greater than 39.3 mm and particularly preferably equal to or greater than 39.5 mm.
  • the diameter is preferably equal to or less than 41.0 mm, more preferably equal to or less than 40.6 mm, and particularly preferably equal to or less than 40.2 mm.
  • the core 4 preferably has an amount of compressive deformation Df1 of equal to or greater than 4.1 mm. With the core 4 having an amount of compressive deformation Df1 of equal to or greater than 4.1 mm, the feel at impact upon putting is soft. In this respect, the amount of compressive deformation Df1 is more preferably equal to or greater than 4.2 mm and particularly preferably equal to or greater than 4.4 mm. In light of resilience performance of the golf ball 2, the amount of compressive deformation Df1 is preferably equal to or less than 6.5 mm, more preferably equal to or less than 6.0 mm, and particularly preferably equal to or less than 5.5 mm.
  • a YAMADA type compression tester For measurement of the amount of compressive deformation, a YAMADA type compression tester is used. In the tester, a sphere (the core 4 or the golf ball 2) is placed on a hard plate made of metal. Next, a cylinder made of metal gradually descends toward the sphere. The sphere, squeezed between the bottom face of the cylinder and the hard plate, becomes deformed. A migration distance of the cylinder, starting from the state in which an initial load of 98 N is applied to the sphere up to the state in which a final load of 1274 N is applied thereto, is measured. A moving speed of the cylinder until the initial load is applied is 0.83 mm/s. A moving speed of the cylinder after the initial load is applied until the final load is applied is 1.67 mm/s.
  • the difference (H1s-H1o) between a Shore C hardness H1s at the surface of the core 4 and a Shore C hardness H1o at the central point of the core 4 is preferably equal to or greater than 10.
  • the core 4 having a difference (H1s-H1o) of equal to or greater than 10 has a so-called outer-hard/inner-soft structure.
  • an appropriate trajectory height and appropriate flight duration are required.
  • the run after landing is short.
  • the golf ball 2 that achieves a desired trajectory height and desired flight duration at a high launch angle the run after landing is long.
  • the golf ball 2 that achieves a desired trajectory height and desired flight duration at a high launch angle is preferable.
  • the core 4 having an outer-hard/inner-soft structure can contribute to a high launch angle and a low spin rate as described above. Although the amount of compressive deformation Df1 is small, the core 4 can contribute to the flight performance of the golf ball 2.
  • the difference (H1s-H1o) is more preferably equal to or greater than 11 and particularly preferably equal to or greater than 12.
  • the difference (H1s-H1o) is preferably equal to or less than 30, more preferably equal to or less than 28, and particularly preferably equal to or less than 25.
  • the central hardness H1o is preferably equal to or greater than 40, more preferably equal to or greater than 45, and particularly preferably equal to or greater than 50.
  • the hardness H1o is preferably equal to or less than 70, more preferably equal to or less than 65, and particularly preferably equal to or less than 60.
  • the hardness H1o is measured with a Shore C type hardness scale mounted to an automated hardness meter (trade name "digi test II” manufactured by Heinrich Bareiss für Anlagenbau GmbH).
  • the hardness scale is pressed against the central point of the cross-section of a hemisphere obtained by cutting the golf ball 2.
  • the measurement is conducted in the environment of 23°C.
  • the surface hardness H1s is preferably equal to or greater than 64, more preferably equal to or greater than 66, and particularly preferably equal to or greater than 68. In light of durability of the golf ball 2, the hardness H1s is preferably equal to or less than 85, more preferably equal to or less than 83, and particularly preferably equal to or less than 80.
  • the hardness H1s is measured with a Shore C type hardness scale mounted to an automated hardness meter (trade name "digi test II” manufactured by Heinrich Bareiss für Anlagenbau GmbH).
  • the hardness scale is pressed against the surface of the core 4. The measurement is conducted in the environment of 23°C.
  • the core 4 preferably has a weight of equal to or greater than 10 g but equal to or less than 42 g.
  • the temperature for crosslinking the core 4 is equal to or higher than 140°C but equal to or lower than 180°C.
  • the time period for crosslinking the core 4 is equal to or longer than 10 minutes but equal to or shorter than 60 minutes.
  • the cover 6 is positioned outside the core 4.
  • the cover 6 is the outermost layer except the mark layer and the paint layer.
  • the cover 6 is formed from a thermoplastic resin composition.
  • the base polymer of the resin composition include ionomer resins, thermoplastic polyester elastomers, thermoplastic polyamide elastomers, thermoplastic polyurethane elastomers, thermoplastic polyolefin elastomers, and thermoplastic polystyrene elastomers.
  • Ionomer resins are particularly preferable. Ionomer resins are highly elastic.
  • the golf ball 2 that includes the cover 6 including an ionomer resin has excellent resilience performance.
  • the cover 6 may be formed from a thermosetting resin composition.
  • an ionomer resin and another resin may be used in combination.
  • the ionomer resin is included as the principal component of the base polymer.
  • the proportion of the ionomer resin to the entire base polymer is preferably equal to or greater than 50% by weight, more preferably equal to or greater than 70% by weight, and particularly preferably equal to or greater than 85% by weight.
  • preferable ionomer resins include binary copolymers formed with an ⁇ -olefin and an ⁇ , ⁇ -unsaturated carboxylic acid having 3 to 8 carbon atoms.
  • a preferable binary copolymer includes 80% by weight or more but 90% by weight or less of an ⁇ -olefin, and 10% by weight or more but 20% by weight or less of an ⁇ , ⁇ -unsaturated carboxylic acid.
  • the binary copolymer has excellent resilience performance.
  • Examples of other preferable ionomer resins include ternary copolymers formed with: an ⁇ -olefin; an ⁇ , ⁇ -unsaturated carboxylic acid having 3 to 8 carbon atoms; and an ⁇ , ⁇ -unsaturated carboxylate ester having 2 to 22 carbon atoms.
  • a preferable ternary copolymer includes 70% by weight or more but 85% by weight or less of an ⁇ -olefin, 5% by weight or more but 30% by weight or less of an ⁇ , ⁇ -unsaturated carboxylic acid, and 1% by weight or more but 25% by weight or less of an ⁇ , ⁇ -unsaturated carboxylate ester.
  • the ternary copolymer has excellent resilience performance.
  • preferable ⁇ -olefins are ethylene and propylene, while preferable ⁇ , ⁇ -unsaturated carboxylic acids are acrylic acid and methacrylic acid.
  • a particularly preferable ionomer resin is a copolymer formed with ethylene and acrylic acid.
  • Another particularly preferable ionomer resin is a copolymer formed with ethylene and methacrylic acid.
  • some of the carboxyl groups are neutralized with metal ions.
  • metal ions for use in neutralization include sodium ion, potassium ion, lithium ion, zinc ion, calcium ion, magnesium ion, aluminum ion, and neodymium ion.
  • the neutralization may be carried out with two or more types of metal ions.
  • Particularly suitable metal ions in light of resilience performance and durability of the golf ball 2 are sodium ion, zinc ion, lithium ion, and magnesium ion.
  • ionomer resins include trade names "Himilan 1555”, “Himilan 1557”, “Himilan 1605", “Himilan 1706", “Himilan 1707”, “Himilan 1856", “Himilan 1855”, “Himilan AM7311”, “Himilan AM7315”, “Himilan AM7317”, “Himilan AM7329”, and “Himilan AM7337”, manufactured by Du Pont-MITSUI POLYCHEMICALS Co., Ltd.; trade names “Surlyn 6120”, “Surlyn 6910", “Surlyn 7930", “Surlyn 7940", “Surlyn 8140”, “Surlyn 8150”, “Surlyn 8940", “Surlyn 8945”, “Surlyn 9120”, “Surlyn 9150”, “Surlyn 9910", “Surlyn 9945”, “Surlyn AD8546", "HPF1000”, and “HPF2000”, manufactured by E.I.
  • IOTEK 7010 du Pont de Nemours and Company
  • IOTEK 7030 trade names "IOTEK 7510", “IOTEK 7520”, “IOTEK 8000”, and "IOTEK 8030”, manufactured by ExxonMobil Chemical Corporation.
  • Two or more ionomer resins may be used in combination.
  • the resin composition of the cover 6 may include a styrene block-containing thermoplastic elastomer.
  • the styrene block-containing thermoplastic elastomer includes a polystyrene block as a hard segment, and a soft segment.
  • a typical soft segment is a diene block.
  • Examples of compounds for the diene block include butadiene, isoprene, 1,3-pentadiene, and 2,3-dimethyl-1,3-butadiene. Butadiene and isoprene are preferable. Two or more compounds may be used in combination.
  • styrene block-containing thermoplastic elastomers examples include styrene-butadiene-styrene block copolymers (SBS), styrene-isoprene-styrene block copolymers (SIS), styrene-isoprene-butadiene-styrene block copolymers (SIBS), hydrogenated SBS, hydrogenated SIS, and hydrogenated SIBS.
  • hydrogenated SBS include styrene-ethylene-butylene-styrene block copolymers (SEBS).
  • hydrogenated SIS examples include styrene-ethylenepropylene-styrene block copolymers (SEPS).
  • SIBS styrene-ethylene-ethylenepropylene-styrene block copolymers
  • the content of the styrene component in the styrene block-containing thermoplastic elastomer is preferably equal to or greater than 10% by weight, more preferably equal to or greater than 12% by weight, and particularly preferably equal to or greater than 15% by weight.
  • the content is preferably equal to or less than 50% by weight, more preferably equal to or less than 47% by weight, and particularly preferably equal to or less than 45% by weight.
  • styrene block-containing thermoplastic elastomers include an alloy of an olefin and one or more members selected from the group consisting of SBS, SIS, SIBS, SEBS, SEPS, and SEEPS.
  • the olefin component in the alloy is presumed to contribute to improvement of compatibility with another base polymer.
  • the alloy can contribute to the resilience performance of the golf ball 2.
  • An olefin having 2 to 10 carbon atoms is preferable.
  • suitable olefins include ethylene, propylene, butene, and pentene. Ethylene and propylene are particularly preferable.
  • polymer alloys include trade names "RABALON T3221C”, “RABALON T3339C”, “RABALON SJ4400N”, “RABALON SJ5400N”, “RABALON SJ6400N”, “RABALON SJ7400N”, “RABALON SJ8400N”, “RABALON SJ9400N”, and “RABALON SR04", manufactured by Mitsubishi Chemical Corporation.
  • styrene block-containing thermoplastic elastomers include trade name “Epofriend A1010” manufactured by Daicel Chemical Industries, Ltd., and trade name “SEPTON HG-252" manufactured by Kuraray Co., Ltd.
  • the proportion of the styrene block-containing thermoplastic elastomer to the entire base polymer is preferably equal to or greater than 2% by weight, more preferably equal to or greater than 4% by weight, and particularly preferably equal to or greater than 6% by weight.
  • the proportion is preferably equal to or less than 30% by weight, more preferably equal to or less than 25% by weight, and particularly preferably equal to or less than 20% by weight.
  • the resin composition of the cover 6 may include a coloring agent, a filler, a dispersant, an antioxidant, an ultraviolet absorber, a light stabilizer, a fluorescent material, a fluorescent brightener, and the like in an adequate amount.
  • a typical coloring agent is titanium dioxide.
  • the cover 6 preferably has a thickness T2 of equal to or less than 2.00 mm.
  • the cover 6 having a thickness T2 of equal to or less than 2.00 mm does not impair soft feel at impact upon putting.
  • the thickness T2 is more preferably equal to or less than 1.85 mm and particularly preferably equal to or less than 1.70 mm.
  • the thickness T2 is preferably equal to or greater than 0.80 mm, more preferably equal to or greater than 0.95 mm, and particularly preferably equal to or greater than 1.05 mm.
  • the thickness T2 is measured at a position immediately below the land 10.
  • the cover 6 has a Shore D hardness H2 of preferably equal to or greater than 50, more preferably equal to or greater than 53, and particularly preferably equal to or greater than 55.
  • the hardness H2 is preferably equal to or less than 65, more preferably equal to or less than 63, and particularly preferably equal to or less than 61.
  • the hardness H2 of the cover 6 is measured according to the standards of "ASTM-D 2240-68".
  • the hardness H2 is measured with a Shore D type hardness scale mounted to an automated hardness meter (trade name "digi test II” manufactured by Heinrich Bareiss für Anlagen GmbH).
  • a sheet that is formed by hot press is formed from the same material as that of the cover 6, and has a thickness of about 2 mm is used. Prior to the measurement, a sheet is kept at 23°C for two weeks. At the measurement, three sheets are stacked.
  • the golf ball 2 preferably has an amount of compressive deformation Df2 of equal to or greater than 3.5 mm. With the golf ball 2 having an amount of compressive deformation Df2 of equal to or greater than 3.5 mm, the feel at impact upon putting is soft. In this respect, the amount of compressive deformation Df2 is more preferably equal to or greater than 3.6 mm and particularly preferably equal to or greater than 3.8 mm. In light of resilience performance of the golf ball 2, the amount of compressive deformation Df2 is preferably equal to or less than 6.0 mm, more preferably equal to or less than 5.5 mm, and particularly preferably equal to or less than 5.0 mm.
  • FIG. 2 shows a device for measuring natural frequencies of the core 4 and the golf ball 2.
  • the device includes a vibration exciter 12, a plate 14, a first acceleration pickup 16, and a second acceleration pickup 18.
  • the plate 14 is mounted on the vibration exciter 12.
  • a sphere (the core 4 or the golf ball 2) is placed on the plate 14.
  • the first acceleration pickup 16 is mounted on the plate 14.
  • the second acceleration pickup 18 is mounted on the sphere. Vibration is applied to the sphere by the vibration exciter 12.
  • a signal of acceleration applied to the sphere is outputted from the first acceleration pickup 16.
  • a signal of the acceleration of the sphere is outputted from the second acceleration pickup 18.
  • a curve is obtained which shows a relationship between frequency and mechanical impedance at the sphere.
  • the frequency at a minimum point of the curve is a natural frequency.
  • the frequency at a minimum point that appears first on the curve is a primary natural frequency.
  • the frequency at a minimum point that appears second on the curve is a secondary natural frequency.
  • the vibration exciter 12 is typically trade name "PET”, manufactured by IMV Corporation.
  • the dynamic signal analyzer is typically trade name "HP-5420A", manufactured by Yokokawa Hewlett-Packard, Ltd.
  • FIG. 3 is a graph showing a relationship between the secondary natural frequency NF(2)1 of the core 4 and the secondary natural frequency NF(2)2 of the golf ball 2.
  • the horizontal axis indicates the secondary natural frequency NF(2)1 of the core
  • the vertical axis indicates the secondary natural frequency NF(2)2 of the golf ball.
  • a straight line indicated by reference sign L1 in this graph is represented by the following mathematical formula.
  • NF 2 2 2 / 3 * NF 2 1 + 1080
  • a value V calculated by the following mathematical formula is equal to or less than 1080 Hz.
  • the golf ball 2 having a value V of equal to or less than 1080 Hz has excellent feel at impact upon putting. With the golf ball 2, the feel at impact upon putting is soft.
  • a straight line indicated by reference sign L2 in the graph of FIG. 3 is represented by the following mathematical formula.
  • NF 2 2 2 / 3 * NF 2 1 + 1040
  • the value V is equal to or less than 1040 Hz.
  • the golf ball 2 having a value V of equal to or less than 1040 Hz has excellent feel at impact upon putting. With the golf ball 2, the feel at impact upon putting is soft.
  • a straight line indicated by reference sign L3 in the graph of FIG. 3 is represented by the following mathematical formula.
  • NF 2 2 2 / 3 * NF 2 1 + 1000
  • the value V is equal to or less than 1000 Hz.
  • the golf ball 2 having a value V of equal to or less than 1000 Hz has excellent feel at impact upon putting. With the golf ball 2, the feel at impact upon putting is soft.
  • the value V is preferably equal to or greater than 800 Hz.
  • a rubber composition A was obtained by kneading 100 parts by weight of a high-cis polybutadiene (trade name "BR-730", manufactured by JSR Corporation), 22.0 parts by weight of zinc diacrylate, 5 parts by weight of zinc oxide, an appropriate amount of barium sulfate, 0.5 parts by weight of diphenyl disulfide, and 0.9 parts by weight of dicumyl peroxide.
  • This rubber composition A was placed into a mold including upper and lower mold halves each having a hemispherical cavity, and heated at 160°C for 20 minutes to obtain a core with a diameter of 39.8 mm. The amount of barium sulfate was adjusted such that the weight of a golf ball was appropriate.
  • a resin composition a was obtained by kneading 47 parts by weight of an ionomer resin (the aforementioned "Himilan 1555"), 46 parts by weight of another ionomer resin (the aforementioned “Himilan 1557”), 7 parts by weight of a styrene block-containing thermoplastic elastomer (the aforementioned "RABALON T3221C”), 4 parts by weight of titanium dioxide, and 0.2 parts by weight of a light stabilizer (trade name "JF-90", manufactured by Johoku Chemical Co., Ltd.) with a twin-screw kneading extruder.
  • an ionomer resin the aforementioned "Himilan 1555"
  • another ionomer resin the aforementioned "Himilan 1557
  • RABALON T3221C styrene block-containing thermoplastic elastomer
  • titanium dioxide the aforementioned "RABALON T3221C”
  • a light stabilizer
  • the core was placed into a final mold that includes upper and lower mold halves each having a hemispherical cavity.
  • the final mold has a large number of pimples on the cavity face thereof.
  • the melted resin composition a was injected around the core to form a cover with a thickness T2 of 1.45 mm. Dimples having a shape that is the inverted shape of the pimples were formed on the cover.
  • a clear paint including a two-component curing type polyurethane as a base material was applied to this cover to obtain a golf ball of Example 1 with a diameter of about 42.7 mm and a weight of about 45.6 g.
  • a driver (trade name "XXIO8", manufactured by DUNLOP SPORTS CO. LTD., shaft hardness: R, loft angle: 10.5°) was attached to a swing machine manufactured by Golf Laboratories, Inc.
  • a golf ball was hit under a condition of a head speed of 40 m/sec, and the ball initial speed, the spin rate, and the flight distance were measured.
  • the flight distance is the distance between the point at the hit and the point at which the golf ball stopped.
  • Tables 4 to 6 The average value of values obtained by 12 measurements is shown in Tables 4 to 6 below.
  • the golf ball of each Example has excellent feel at impact upon putting and has excellent flight performance upon a shot with a driver. From the results of evaluation, advantages of the present invention are clear.
  • the golf ball according to the present invention is suitable for, for example, playing golf on golf courses and practicing at driving ranges.
  • the above descriptions are merely illustrative examples, and various modifications can be made without departing from the principles of the present invention, as defined by the appended claims.

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Claims (8)

  1. Balle de golf en deux parties incluant un noyau et une couverture positionnée à l'extérieur du noyau, dans laquelle
    une valeur V calculée par la formule mathématique suivante est égale ou inférieure à 1080 Hz, V = NF 2 2 − 2 / 3 * NF 2 1,
    Figure imgb0008
     dans laquelle NF(2)1 représente une fréquence naturelle secondaire du noyau, et NF(2)2 représente une fréquence naturelle secondaire de la balle de golf.
  2. Balle de golf en deux parties selon la revendication 1, dans laquelle une différence (H1s-H1o) entre une dureté Shore C H1s à une surface du noyau et une dureté Shore C H1o à un point central du noyau est égale ou supérieure à 10.
  3. Balle de golf en deux parties selon la revendication 1 ou 2, dans laquelle la valeur V est égale ou inférieure à 1040 Hz.
  4. Balle de golf en deux parties selon la revendication 3, dans laquelle la valeur V est égale ou inférieure à 1000 Hz.
  5. Balle de golf en deux parties selon l'une quelconque des revendications 1 à 4, dans laquelle une quantité de déformation par compression Df1 du noyau est égale ou supérieure à 4,1 mm.
  6. Balle de golf en deux parties selon l'une quelconque des revendications 1 à 5, dans laquelle une quantité de déformation par compression Df2 de la balle de golf en deux parties est égale ou supérieure à 3,5 mm.
  7. Balle de golf en deux parties selon l'une quelconque des revendications 1 à 6, dans laquelle une épaisseur T2 de la couverture est égale ou supérieure à 0,80 mm, mais égale ou inférieure à 2,00 mm.
  8. Balle de golf en deux parties selon l'une quelconque des revendications 1 à 7, dans laquelle une dureté Shore D H2 de la couverture est égale ou supérieure à 50 mais égale ou inférieure à 65.
EP16193917.8A 2015-12-14 2016-10-14 Balle de golf en deux parties Active EP3181199B1 (fr)

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JP6631224B2 (ja) 2020-01-15
KR102602817B1 (ko) 2023-11-15
CN106938134A (zh) 2017-07-11
CN106938134B (zh) 2020-05-05
US20170165529A1 (en) 2017-06-15
JP2017108762A (ja) 2017-06-22
KR20170070798A (ko) 2017-06-22
EP3181199A2 (fr) 2017-06-21

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