EP1522332B1 - Vierteiliger Golfball - Google Patents

Vierteiliger Golfball Download PDF

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Publication number
EP1522332B1
EP1522332B1 EP04022199.6A EP04022199A EP1522332B1 EP 1522332 B1 EP1522332 B1 EP 1522332B1 EP 04022199 A EP04022199 A EP 04022199A EP 1522332 B1 EP1522332 B1 EP 1522332B1
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EP
European Patent Office
Prior art keywords
inches
golf ball
cover layer
shore
thickness
Prior art date
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Expired - Fee Related
Application number
EP04022199.6A
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English (en)
French (fr)
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EP1522332A1 (de
Inventor
Frank M. Simonutti
Lane D. Lemons
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Wilson Sporting Goods Co
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Wilson Sporting Goods Co
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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B45/00—Apparatus or methods for manufacturing 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
    • 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
    • A63B37/0023—Covers
    • A63B37/0029—Physical properties
    • A63B37/0035—Density; Specific gravity
    • 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
    • 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

Definitions

  • the present invention relates to the field of golf balls.
  • the golf club/ball impact can best be described as a violent collision.
  • the typical professional can swing a 200 to 300 gram (7.06 to 10.6 ounce) driver and attain club speeds at the moment of impact of 105 mph (169 km/h) to 115 mph (185 km/h) striking a 46 gram (1.62 ounces) golf ball resting on a tee.
  • One side of the golf ball is smashed against the face of the club which can result in the balls of the prior art compressing nearly 20% before the golf ball leaves the tee.
  • the golf ball then accelerates from rest to speeds of approximately 155 mph (249 km/h) to 170 mph (274 km/h) and spin rates of 2000 to 4000 rpm's in less than half a millisecond, experiencing 50,000 times the force of gravity.
  • golf balls were molded using wound cores, which comprised a soft rubber center surrounded by a layer of thread rubber windings.
  • wound cores comprised a soft rubber center surrounded by a layer of thread rubber windings.
  • Surlyn® balls with ionomer covers (produced by E.I. du Pont de Nemours and Company, 1007 Market ST Wilmington, Delaware 19898 ("DuPont") under the trade name Surlyn®) were introduced.
  • Balls molded with Surlyn® covers were produced with both thread wound cores and solid rubber cores.
  • the balls molded using initial grades of Surlyn® and solid cores (hereafter referred to as "two-piece balls”) were significantly less expensive to produce; however, the initial two-piece golf balls were hard, having an unpleasant feel to the golfer.
  • Prior art golf balls are generally manufactured with a core made primarily from polybutadiene rubber, which is covered with a fairly hard, thin, ionomer inner cover, which is subsequently covered by a polyurethane or balata/polybutadiene outer cover. While providing adequate playing characteristics at a less expensive production cost, these solid balls typically exhibit lower velocities at driver impact than wound balls using like cover materials.
  • Prior art golf balls have used in their cores, mantles, and cover layers, either thermoset materials or thermoplastic materials. The prior art thermoplastic material allows for greater ease in manufacturing, but reduces resilience. Conversely, thermoset material is difficult to work with, but provides the needed resilience.
  • a golf ball in accordance with the principles of the present invention is economical to produce with known manufacturing equipment and provides spin control, durability, and feel while conforming to regulations.
  • One aspect of the present invention relates to a four-piece golf ball that performs well and is made of highly workable material.
  • the golf ball has a core, a mantle, an inner cover layer, and an outer cover layer.
  • the core provides spin control and a solid resilient structure to which the mantle can be molded.
  • the mantle provides high resilience.
  • the cover is comprised of two layers to provide adequate resilience and performance while still being able to accept dimples.
  • the Figure illustrates a cross-section of a golf ball in accordance with the principles of the present invention.
  • a golf ball in accordance with the principles of the present invention comprises a four-piece solid golf ball 10, wherein the four layers consist of (1) a center layer or core 12 comprising a first composition, (2) a middle layer or mantle 14 comprising a second composition, (3) an inner cover layer 16 comprising a third composition, and (4) a outer cover layer 18 on which the dimples are molded comprising a fourth composition.
  • the core 12 provides some control of spin as well as a solid resilient structure to which the second layer is molded; the mantle 14 provides high resilience for the ball and increases spin; the inner cover 16 provides a suitable material for durability, control, and spin; and the outer cover 18 provides a suitable material for durability, control, spin, and dimple molding.
  • the core 12 is a solid comprised of a diene rubber, has a diameter of between about 1.00 (25.4 mm) and about 1.40 inches (35.6 mm), and has a defection under a 200 Ib. (90.7 kg) static load of between about 0.100 inches (2.5 mm) and about 0.180 inches (4.6 mm).
  • the core has a diameter of 1.20 inches (30.5 mm) to 1.38 inches (35.1 mm) and comprises a high cis-1,4 content (94% or greater) polybutadiene, 20 to 28 parts by weight of a co-crosslinking agent comprised primarily of a zinc salt of an unsaturated acrylate; 3 to 5 parts by weight of a metal oxide activator, preferably zinc oxide; and 0.8 to 1.5 parts per hundred resin of a free radical initiator.
  • a co-crosslinking agent comprised primarily of a zinc salt of an unsaturated acrylate
  • a metal oxide activator preferably zinc oxide
  • 0.8 to 1.5 parts per hundred resin of a free radical initiator 0.8 to 1.5 parts per hundred resin of a free radical initiator.
  • the mantle 14 is a thermoplastic material having a thickness of between about 0.050 inches (1.27 mm) and about 0.27 inches (6.9 mm); a Shore D hardness of 62 or below; and comprises about 7% to 12% by weight of a carboxylic acid, preferably acrylic acid, about 12% to 20% by weight of an acrylate salt, preferably n-butyl acrylate, and about 71% to 80% by weight of ethylene.
  • the carboxylic acid in the mantle is 100% neutralized with metal ions, preferably magnesium ions.
  • C.O.R coefficient of restitution
  • initial velocity will not be sufficient to produce the performance required for a premium golf ball.
  • the C.O.R is a measurement of the amount of energy returned in an inelastic collision, such as the impact between the golf ball and the club face. It is expressed as a ratio of energy present in the system before the impact to energy present in the system just after impact. This relates to the energy present in the ball and clubhead velocity just after the ball/club impact.
  • the inner cover layer 16 comprises a blend of ionomers having a Shore D hardness of 65 or more and a thickness of about 0.020 inches (0.51 mm) to about 0.050 inches (1.27 mm).
  • the outer cover layer 18 comprises thermoplastic polyurethane or thermoset material having a Shore D hardness of greater than 53 and a thickness of greater than 0.040 inches (1.02 mm).
  • a ball made in accordance with the principles of the present invention has a core with a deflection of between about 0.100 inches (2.5 mm) and 0.180 inches (4.6 mm) under an applied load of 200 Ib (90.7 kg).
  • the mantle 14 has a thickness of about 0.065 inches (1.65 mm) to 0.140 inches (3.6 mm), and a Shore D hardness of 55 to 62, and comprises a terpolymer consisting of approximately 70% to 80% ethylene; approximately 8% to 10.5% acrylic acid; and approximately 12% to 20% n-butyl acrylate, where 100% of the carboxylic acid groups are neutralized with magnesium ions.
  • the inner cover layer 16 comprises a blend of ionomers with a Shore D hardness of between 68 and 73, and a thickness of 0.025 inches (0.635 mm) to 0.045 inches (1.14 mm).
  • the outer cover layer 18 comprises a thermoplastic polyurethane or a thermoset material having a Shore D hardness of between 56 and 62, and a thickness of approximately 0.040 inches (1.02 mm) to 0.055 inches (1.40 mm).
  • the ball may be balanced.
  • a balanced ball does not depart from its intended flight or roll path due to an off-center core or outer layers of inconsistent thickness.
  • the ball would have a core, mantle, inner and outer cover layer that are of uniform density without any uneven areas of distribution. This can be accomplished by blending essentially nonreactive materials with the particular components of the golf ball.
  • a truly balanced ball in accordance with the principles of the present invention has a uniform density.
  • Materials suitable for use in adjusting the density of the component parts can be chosen from the group consisting of inorganic materials, organic materials, and combinations thereof.
  • Preferred inorganic fillers comprise zinc oxide, barium sulfate, titanium dioxide, or a combination thereof.
  • An unbalanced ball will generally have a light spot and a heavy spot.
  • a salt water solution of the float test described below When an unbalanced ball is repeatedly spun in a salt water solution of the float test described below, the ball will tend to consistently orient itself in the solution with its light spot up and its heavy spot down.
  • the "float" test is performed by filling a container with warm water. A salt, such as sodium chloride, is then added to the solution in sufficient amount to enable one or more golf balls to float in the solution. Preferably, a few drops of detergent are added to the container. The ball is spun and when the ball stops spinning in water, then the top is marked. The spinning is repeated to determine if the same portion will again be at the top when the ball stops.
  • a balanced ball would exhibit no orientational preference when placed in a salt bath of equivalent density.
  • the cover layer is adjusted to a target specific gravity of about 1.125 using inert fillers.
  • the core, mantle, inner cover layer and outer cover layer all have a specific gravity of between about 1.118 and about 1.132, with the golf ball preferably having a specific gravity of about 1.125.
  • a golf ball in accordance with the principles of the present invention was made having a core as set forth below in the master batch formulas: Table 1: Master Batch Formula Material Phr Polybutadiene Rubber 97.56 Millable Polyurethane 2.44 Zinc Diacrylate 90.28 Zinc Oxide 4.88 Titanium Dioxide 18.3 Colorant .16
  • the material used for molding the mantle was a terpolymer of ⁇ 76% ethylene, ⁇ 8.5% acrylic acid, and ⁇ 15.5% by weight n-butyl acrylate, wherein 100% of the acrylic acid groups was neutralized with magnesium ions.
  • This material is available from DuPont, under product number AD1016.
  • the terpolymer was compounded with barium sulfate and titanium dioxide to a specific gravity of 1.125.
  • the inner cover layer of the example balls was molded using ionomers produced and provided by DuPont under the product name Surlyn TM , in the following blend: Surlyn TM 6120 - 40 phr and Surlyn TM 8140 - 60 phr.
  • the blend was compounded with barium sulfate and titanium dioxide to a specific gravity of 1.125.
  • the outer cover layer for the balls of examples 1 and 2, was molded using the thermoset material formula outlined below using the second pass batch, with 432 dimples in an icosadodecahedron pattern consistent through all examples, as well as in the control ball: Table 2: Second Pass Formula Material Phr Trans-polyisoprene 59.00 Peroxide 2.00 Master Batch Compound 87.57
  • the compound was mixed in two parts. First a master batch was mixed as described in Table 1, followed by a second pass procedure to mix the peroxide and balata into the compound as described in Table 2. Mixing was performed using techniques well known to those in the golf ball industry.
  • Balls were buffed, finished and painted using methods known in the art. Balls were tested for performance properties compared to a premium performance golf ball, specifically the Staff® True Tour TM , produced by Wilson Sporting Goods Company, 8700 West Bryn Mawr Avenue, Chicago, Illinois 60631.
  • Balls of Example 1 were molded using layers as described above. Specifically, the layers were as follows: • Core - 1.25 inches diameter, 0.150 deflection under an applied load of 200 Ib. • Mantle - 0.135 inches thickness. • Inner cover layer - 0.0325 inches thickness, Shore D hardness 72. • Outer cover layer - 0.0475 inches thickness, Shore D hardness 60. Table 3: Example 1 Physical Properties Ball Size Defl.
  • Weight Shore D Example 1 1.681 .085 45.52 61 Wilson Staff® True Tour TM 1.679 .087 45.42 62 Shore D Hardness was measured using a Shore D durometer (manufactured by Instron Corporation, 100 Royall Street, Canton, Massachusetts, 02021) with the hardness reading taken at the surface of the ball. Deflection was measured under a 200 Ib. applied load, using Wilson Dead Weight Deflection testing machine. The deflection of a test subject golf ball is taken by placing the ball between two round plates, which are supported from below by round shafts. A force is then applied forcing the bottom plate to compress the ball into the upper plate, using a lever mechanism. The force applied is a nominal 200 Ibs. The deflection is determined by taking the measured distance between the inside of the two plates at contact and the measured distance between the inside of the two plates at some time after the force is applied. The deflection is calculated as the simple difference between the two measurements.
  • Driver test results are an average of 3 tests at the following conditions: (1) club head velocity of 160 ft/s and (2) launch angle of 9.5°.
  • Balls of Example 2 were molded using layers as described above. Specifically the layers were as follows: • Core - 1.375 inches diameter, 0.135 deflection under an applied load of 200 lb. • Mantle - 0.0725 inches thickness. • Inner cover layer- 0.0325 inches thickness, Shore D hardness 72. • Outer cover layer - 0.0475 inches thickness, Shore D hardness 60. Table 5: Example 2 Physical Properties Ball Size Defl. Weight Shore D Example 2 1.678 .080 45.02 61 Wilson Staff® True Tour TM 1.680 .090 45.46 61 Shore D Hardness was measured using a Shore D durometer with the hardness reading taken at surface of ball. Deflection was measured under 200 lb. applied load, using Wilson Dead Weight Deflection testing machine.
  • Driver test results are an average of 3 tests at the following conditions: (1) club head velocity of 160 ft/s and (2) launch angle of 9.5°.
  • Balls of Example 3 were molded using layers as described above. Specifically the layers were as follows: • Core - 1.130 inches diameter, 0.135 deflection under an applied load of 200 lb. • Mantle - 0.0725 inches thickness. • Inner cover layer - 0.0325 inches thickness, Shore D hardness 72. • Outer cover layer - 0.0475 inches thickness, Shore D hardness 60. Table 5: Example 3 Physical Properties Ball Size (in) Defl. (in) Weight (g) Shore D Example 3 1.684 0.083 45.93 59 Wilson Staff® True Tour TM 1.680 0.081 45.43 59 Shore D Hardness was measured using a Shore D durometer with the hardness reading taken at surface of ball. Deflection was measured under 200 lb. applied load, using Wilson Dead Weight Deflection testing machine.
  • Driver test results are an average of 3 tests at the following conditions: (1) club head velocity of 167 ft/s and (2) launch angle of 9.5°.
  • Example 3 As seen by comparing the ball of Example 3 and the Titleist Pro V1, the ball of Example 3 outperformed the other balls For example the ball of Example 3 had a higher initial velocity and a lower spin rate than the Titleist Pro V1. Additionally, Example 3 carried nearly 10 yards farther and had a longer total distance than the Titleist Pro V1.
  • Example 3 As seen by comparing the ball of Example 3 and the Titleist Pro V1, the ball of Example 3 outperformed the other balls For example the ball of Example 3 had a higher initial velocity and a lower spin rate than the Titleist Pro V1. Additionally, Example 3 carried nearly 5 yards farther and had a longer total distance than the Titleist Pro V1.
  • Example 3 As seen by comparing the ball of Example 3 and the Titleist Pro V1, the ball of Example 3 outperformed the other balls For example the ball of Example 3 had a higher initial velocity and a lower spin rate than the Titleist Pro V1. Additionally, Example 3 carried and rolled farther and had a longer total distance than the Titleist Pro V1.
  • both examples increase ball speed, and reduce spin rate on the driver. This results in increased distance, through both carry and roll. Also with this increased speed and lower spin, more optimum dimples can be utilized which could potentially increase distance further.
  • the ball of the present invention exhibits the desired low spin/high velocity off of the golf tee; yet, it also exhibits the desired high spin and controllability when hit on the green with a club such as a 9-iron.

Claims (21)

  1. Golfball umfassend:
    einen Kern (12), umfassend Polybutadien mit einem hohen cis-1,4-Gehalt von 94% oder mehr, 20 bis 28 Gewichtsteile eines Co-Quervernetzungsmittels, das hauptsächlich aus einem Zinksalz aus einem ungesättigten Acrylat gebildet ist, 3 bis 5 Gewichtsteile eines Metalloxidaktivators, und 0,8 bis 1,5 Teile pro Hundert Harz eines Initiators für freie Radikale;
    einen Mantel (14) bestehend aus einem Terpolymer bestehend aus 70 bis 80% Ethylen, 8 bis 10,5% Acrylsäure und 12 bis 20% n-Butylacrylat, wobei 100% der Carboxylsäuregruppen mit Magnesiumionen neutralisiert sind;
    eine Umhüllung mit einer inneren Umhüllung (16) und einer äußeren Umhüllung (18);
    wobei die Schicht der inneren Umhüllung (16) eine Mischung von Ionomeren umfasst; und
    die Schicht der äußeren Umhüllung (18) ein thermoplastisches Polyurethan umfasst.
  2. Golfball nach Anspruch 1, wobei der Kern (12) einen Durchmesser von 30 mm bis 35 mm (1,2 Inch bis 1,38 Inch) aufweist.
  3. Golfball nach Anspruch 1, wobei der hohe cis-1,4-Gehalt an Polybutadien höher als 94% ist.
  4. Golfball nach Anspruch 3, wobei der Kern (12) unter angewendeter Belastung von 90,7 kg (200 lb) eine Ablenkung von 2,54 mm bis 4,57 mm (0,100 und 0,180 Inch) aufweist.
  5. Golfball nach Anspruch 1, wobei der Mantel (14) eine Dicke von 1,65 mm bis 3,65 mm (0,065 Inch bis 0,140 Inch) und eine Shore-D-Härte im Bereich von 55 bis 62 aufweist.
  6. Golfball nach Anspruch 1, wobei die innere Umhüllung (16) eine Mischung von Ionomeren mit einer Shore-D-Härte von 65 oder mehr und eine Dicke von 0,51 mm bis 1,27 mm (0,020 Inch bis 0,050 Inch) aufweist.
  7. Golfball nach Anspruch 1, wobei die innere Umhüllung (16) eine Shore-D-Härte im Bereich von 68 bis 73 und eine Dicke von 0,64 mm bis 1,14 mm (0,025 Inch bis 0,045 Inch) aufweist.
  8. Golfball nach Anspruch 1, wobei die äußere Umhüllung (18) eine Shore-D-Härte im Bereich von 56 bis 62 und eine Dicke von 1,02 mm bis 1,40 mm (0,040 Inch bis 0,055 Inch) aufweist.
  9. Golfball nach Anspruch 1, wobei der Kern (12), das Zentrum, der Mantel (14) die innere Umhüllung (16) und die äußere Umhüllung (18) dieselbe spezifische Dichte aufweisen.
  10. Golfball nach Anspruch 1, ferner umfassend ein Füllmittel ausgewählt aus der Gruppe bestehend aus Zinkoxid, Bariumsulfat, Titandioxid, und Kombinationen daraus.
  11. Golfball umfassend:
    eine zentrale Schicht (12) umfassend einen Dienkautschuk, mit einem Durchmesser von zwischen 25,4 mm und 35,6 mm (1,00 Inch und 1,40 Inch) und einer Ablenkung unter einer statischen Belastung von 90,7 kg (200 lb) von zwischen 2,54 mm und 4,57 mm (0,100 Inch und 0,180 Inch);
    eine mittlere Schicht (14) bestehend aus einem thermoplastischen Material mit einer Dicke von 1,27 mm bis 6,86 mm (0,050 Inch und 0,27 Inch), eine Shore-D-Härte von 62 oder niedriger;
    eine innere Umhüllung (16) umfassend eine Mischung von Ionomeren, eine Shore-D-Härte von wenigstens 65, und eine Dicke von 0,51 mm bis 1,27 mm (0,020 Inch bis 0,050 Inch); und eine äußere Umhüllung (18) umfassend ein thermoplastisches Polyurethan mit einer Shore-D-Härte über 53 und einer Dicke, die größer ist als 1,02 mm (0,040 Inch),
    wobei das thermoplastische Material aus 7 Gew.-% bis 12 Gew.-% Carboxylsäure, 12 Gew.-% bis 20 Gew.-% Acrylatsalz, und 71 Gew.-% bis 80 Gew.-% Ethylen besteht,
    wobei die Carboxylsäure eine Acrylsäure ist und das Acrylatsalz n-Butylacrylat ist,
    wobei 100% der Carboxylsäuregruppen mit einem Metallion neutralisiert sind.
  12. Golfball nach Anspruch 11, wobei das Metallion Magnesium ist.
  13. Golfball nach Anspruch 11, wobei das Zentrum (12) folgendes umfasst:
    ein Polybutadien;
    20 bis 28 Gewichtsteile eines Co-Quervernetzungsmittels, das hauptsächlich aus einem Zinksalz aus einem ungesättigten Acrylat besteht;
    3 bis 5 Gewichtsteile eines Metalloxidaktivators; und
    0,8 bis 1,5 Teile aus Hundert Teilen Harz eines freien radikalen Initiators.
  14. Golfball nach Anspruch 11, wobei der cis-1,4-Gehalt des Polybutadiens 94% oder mehr beträgt.
  15. Golfball nach Anspruch 11, wobei der Kern, das Zentrum (12), der Mantel (14), die innere Deckschickt (16) und die äußere Deckschickt (18) dieselbe spezifische Dichte aufweisen.
  16. Golfball nach Anspruch 11, ferner umfassend ein Füllmittel ausgewählt aus der Gruppe bestehend aus Zinkoxid, Bariumsulfat, Titandioxid und Kombinationen daraus.
  17. Verfahren zur Herstellung eines Golfballs (10) umfassend:
    Ausbilden eines Kerns (12) mit einem Durchmesser von 30 mm bis 35 mm (1,2 Inch bis 1,38 Inch) umfassend einen Dienkautschuk;
    Ausbilden eines Mantels (14) mit einer Dicke von 1,65 mm bis 3,56 mm (0,065 Inch bis 0,140 Inch) bestehend aus einem Terpolymer bestehend aus 70% bis 80% Ethylen, 8% bis 10,5% Acrylsäure, und 12% bis 20% n-Butylacrylat, wobei 100% der Carboxylsäuregruppen mit Metallionen neutralisiert sind;
    Ausbilden einer inneren Umhüllung (16) mit einer Dicke von 0,64 mm bis 1,14 mm (0,025 Inch bis 0,045 Inch) umfassend Ionomere; und
    Ausbilden einer äußeren Umhüllung (18) mit einer Dicke von 1,02 mm bis 1,40 mm (0,040 Inch bis 0,055 Inch) umfassend Duroplast.
  18. Verfahren zur Herstellung eines Golfballs (10) nach Anspruch 17, ferner umfassend das Ausbilden des Kerns (12) mit einem Dienkautschuk, umfassend:
    ein Polybutadien mit einem hohen cis-1,4-Gehalt von 94% oder mehr;
    20 bis 28 Gewichtsteile eines Co-Quervernetzungsmittels, das hauptsächlich aus einem Zinksalz aus einem ungesättigten Acrylat besteht;
    3 bis 5 Gewichtsteile eines Metalloxidaktivators; und
    0,8 bis 1,5 Teile pro Hundert Harz aus einem Initiator für freie Radikale.
  19. Verfahren zur Herstellung eines Golfballs (10) nach Anspruch 17, ferner umfassend das Ausbilden der inneren Umhüllung (16) mit einer Shore-D-Härte zwischen 68 und 73.
  20. Verfahren zur Herstellung eines Golfballs (10) nach Anspruch 17, ferner umfassend das Ausbilden der äußeren Umhüllung (18) mit einer Shore-D-Härte zwischen 56 und 62.
  21. Verfahren nach Anspruch 17, ferner umfassend den Schritt des Herstellens des Kerns, des Zentrums (12), des Mantels (14), der inneren Umhüllung (16) und der äußeren Umhüllung (18), wobei diese dieselbe spezifische Dichte aufweisen.
EP04022199.6A 2003-10-09 2004-09-17 Vierteiliger Golfball Expired - Fee Related EP1522332B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US682321 2001-08-20
US10/682,321 US20040102257A1 (en) 2002-08-22 2003-10-09 Four piece golf ball

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JP2005118550A (ja) 2005-05-12
EP1522332A1 (de) 2005-04-13

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