EP0895792B1 - Balle de golf solide en plusieurs pièces - Google Patents

Balle de golf solide en plusieurs pièces Download PDF

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Publication number
EP0895792B1
EP0895792B1 EP19980306349 EP98306349A EP0895792B1 EP 0895792 B1 EP0895792 B1 EP 0895792B1 EP 19980306349 EP19980306349 EP 19980306349 EP 98306349 A EP98306349 A EP 98306349A EP 0895792 B1 EP0895792 B1 EP 0895792B1
Authority
EP
European Patent Office
Prior art keywords
cover layer
golf ball
weight
shore
hardness
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.)
Expired - Lifetime
Application number
EP19980306349
Other languages
German (de)
English (en)
Other versions
EP0895792A1 (fr
Inventor
Hiroshi Bridgestone Sports Co. Ltd. Higuchi
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.)
Bridgestone Sports Co Ltd
Original Assignee
Bridgestone Sports Co 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 Bridgestone Sports Co Ltd filed Critical Bridgestone Sports Co Ltd
Publication of EP0895792A1 publication Critical patent/EP0895792A1/fr
Application granted granted Critical
Publication of EP0895792B1 publication Critical patent/EP0895792B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • A63B37/0035—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
    • A63B37/005—Cores
    • A63B37/006—Physical properties
    • A63B37/0066—Density; Specific gravity

Definitions

  • This invention relates to a multi-piece solid golf ball comprising a solid core enclosed with a cover having an inner and an outer layer.
  • a multi-piece solid golf ball comprising a solid core and a cover of two inner and outer layers surrounding the core that the solid core is formed relatively soft, the inner cover layer is formed mainly of a thermoplastic polyester elastomer, the outer cover layer is formed mainly of a thermoplastic polyurethane elastomer, the inner cover layer has a Shore D hardness of 28 to 58, and the outer cover layer has a Shore D hardness of 30 to 55.
  • the present invention provides:
  • the golf ball of the invention features an increased flight distance, superior control upon iron shots, good feeling upon shots with any club of wood, iron and putter, high resistance to scraping upon control shots with an iron, and good durability.
  • the multi-piece solid golf ball of the invention has a solid core and a cover surrounding the core of a two-layer structure of inner and outer cover layers.
  • the solid core used herein is formed mainly of a rubber base.
  • Natural rubber and/or synthetic rubber which is used in conventional solid golf balls can be used as the rubber base although 1,4-polybutadiene having at least 40% of a cis structure is especially preferred in the practice of the invention.
  • natural rubber, polyisoprene rubber, styrene-butadiene rubber or the like may be blended with the polybutadiene rubber if desired.
  • the solid core of the golf ball according to the invention is obtained in conventional ways by adjusting vulcanizing conditions and blending ratio.
  • the solid core composition contains a base rubber, a crosslinking agent, a co-crosslinking agent, an inert filler, etc.
  • the base rubber used may be the above-mentioned natural rubber and/or synthetic rubber.
  • the crosslinking agent is exemplified by organic peroxides such as dicumyl peroxide and di-t-butyl peroxide, with the dicumyl peroxide being especially preferred.
  • the amount of the crosslinking agent blended is usually 0.5 to 2.0 parts by weight per 100 parts by weight of the base rubber.
  • the co-crosslinking agent is not critical and exemplified by metal salts of unsaturated fatty acids, especially zinc and magnesium salts of unsaturated fatty acids having 3 to 8 carbon atoms (e.g., acrylic acid and methacrylic acid), with zinc acrylate being especially preferred.
  • the amount of the co-crosslinking agent blended is 3 to 50 parts by weight, preferably 20 to 48 parts by weight per 100 parts by weight of the base rubber.
  • the inert filler examples include zinc oxide, barium sulfate, silica, calcium carbonate, and zinc carbonate, with zinc oxide and barium sulfate being commonly used.
  • the amount of the filler blended is governed by the specific gravity of the core and the cover, the weight specification of the ball, etc. and not critical although it is usually 10 to 30 parts by weight per 100 parts by weight of the base rubber. It is understood that in the practice of the invention, the solid core is given an optimum hardness by properly adjusting the amount of zinc oxide and barium sulfate blended.
  • a solid core composition is prepared by kneading the above-mentioned components in a conventional mixer such as a Banbury mixer and roll mill, and it is compression or injection molded in a core mold. The molding is then cured into a solid core by heating at a sufficient temperature for the crosslinking agent and co-crosslinking agent to function (for example, about 130 to 170°C when dicumyl peroxide and zinc acrylate are used as the crosslinking agent and the co-crosslinking agent, respectively).
  • the solid core should have a distortion or deformation of at least 2.7 mm, preferably 2.9 to 7.0 mm, more preferably 3.0 to 6.0 mm under an applied load of 100 kg.
  • a distortion of less than 2.7 mm under an applied load of 100 kg (hard core) would give disadvantages such as a hard hitting feel.
  • a too much distortion (too soft core) would sometimes result in poor restitution.
  • the solid core preferably has a specific gravity of 0.9 to 1.2, more preferably 1.04 to 1.20, especially 1.05 to 1.18.
  • the solid core preferably has a diameter of 30 to 40 mm, especially 33 to 39 mm.
  • the solid core may be of multi-layer structure insofar as it satisfies the above-defined distortion under an applied load of 100 kg.
  • the inner cover layer is formed mainly of a thermoplastic polyester elastomer.
  • thermoplastic polyester elastomer used herein includes polyether ester type multi-block copolymers synthesized from terephthalic acid, 1,4-butane diol, and polytetramethylene glycol (PTMG) or polypropylene glycol (PPG) wherein polybutylene terephthalate (PBT) portions become hard segments and polytetramethylene glycol (PTMG) or polypropylene glycol (PPG) portions become soft segments, for example, Hytrel 3078, 4047, G3548W, 4767, and 5577 (by Toray duPont K.K.).
  • PBT polytetramethylene glycol
  • PPG polypropylene glycol
  • an ionomer resin having a Shore D hardness of at least 55, preferably 55 to 70, more preferably 56 to 69 can be added in a proportion of less than 70 parts by weight per 100 parts by weight of the thermoplastic polyester elastomer.
  • the ionomer resin having a Shore D hardness of at least 55 is not contained in the outer cover layer to be described later, it is essential to mix the ionomer resin with the thermoplastic polyester elastomer.
  • Preferably 3 to 70 parts by weight, more preferably 4 to 68 parts by weight of the ionomer resin is mixed per 100 parts by weight of the thermoplastic polyester elastomer.
  • thermoplastic polyester elastomer may be blended with the thermoplastic polyester elastomer insofar as the objects of the invention are not impaired.
  • the inner cover layer composed mainly of the thermoplastic polyester elastomer may contain 0 to about 30% by weight of an inorganic filler such as zinc oxide, barium sulfate, and titanium dioxide.
  • the inner cover layer should have a Shore D hardness of 28 to 58, especially 30 to 56. A Shore D hardness of less than 28 would detract from restitution whereas hitting feel would become too hard above 58.
  • the inner cover layer should preferably have a specific gravity of 1.05 to 1.3, especially 1.06 to 1.2.
  • the inner cover layer preferably has a gage of 0.5 to 3.0 mm, especially 1.0 to 2.5 mm.
  • the outer cover layer is formed of a thermoplastic polyurethane elastomer.
  • thermoplastic polyurethane elastomer used herein has a molecular structure consisting of a high molecular weight polyol compound constituting a soft segment, a monomolecular chain extender constituting a hard segment, and a diisocyanate.
  • the high molecular weight polyol compound is not critical and may be any of polyester polyols, polyether polyols, copolyester polyols, and polycarbonate polyols.
  • Exemplary polyester polyols include polycaprolactone glycol, poly(ethylene-1,4-adipate) glycol, and poly(butylene-1,4-adipate) glycol; an exemplary copolyester polyol is poly(diethylene glycol adipate) glycol; an exemplary polycarbonate polyol is (hexanediol-1,6-carbonate) glycol; and an exemplary polyether polyol is polyoxytetramethylene glycol.
  • Their number average molecular weight is about 600 to 5,000, preferably 1,000 to 3,000.
  • diisocyanate aliphatic diisocyanates are preferably used in consideration of the yellowing resistance of the cover. Examples include hexamethylene diisocyanate (HDI), 2,2,4- or 2,4,4-trimethylhexamethylene diisocyanate (TMDI), and lysine diisocyanate (LDI). HDI is especially preferred for its compatibility with another resin upon blending.
  • the monomolecular chain extender is not critical and may be selected from conventional polyhydric alcohols and amines. Examples include 1,4-butylene glycol, 1,2-ethylene glycol, 1,3-propylene glycol, 1,6-hexylene glycol, 1,3-butylene glycol, dicyclohexylmethylmethanediamine (hydrogenated MDA), and isophoronediamine (IPDA).
  • 1,4-butylene glycol 1,2-ethylene glycol, 1,3-propylene glycol, 1,6-hexylene glycol, 1,3-butylene glycol, dicyclohexylmethylmethanediamine (hydrogenated MDA), and isophoronediamine (IPDA).
  • thermoplastic polyurethane elastomers those having a tans peak temperature of lower than -15°C, especially -16°C to -50°C as determined by viscoelasticity measurement are preferred in view of resiliency.
  • thermoplastic polyurethane elastomer there may be used commercially available ones whose diisocyanate component is aliphatic, for example, Pandex T7298 (-20°C), T7295 (-26°C), and T7890 (-30°C) (by Dai-Nihon Ink Chemical Industry K.K.). Note that the numerals in parentheses each represent a tan ⁇ peak temperature.
  • an ionomer resin having a Shore D hardness of at least 55, preferably 55 to 70, more preferably 56 to 69 can be added in a proportion of less than 70 parts by weight per 100 parts by weight of the thermoplastic polyurethane elastomer.
  • the ionomer resin having a Shore D hardness of at least 55 is not contained in the aforementioned inner cover layer, it is essential to mix the ionomer resin with the thermoplastic polyurethane elastomer.
  • Preferably 2 to 70 parts by weight, more preferably 3 to 68 parts by weight of the ionomer resin is mixed per 100 parts by weight of the thermoplastic polyurethane elastomer.
  • thermoplastic polyurethane elastomer may be blended with the thermoplastic polyurethane elastomer insofar as the objects of the invention are not impaired.
  • the outer cover layer composed mainly of the thermoplastic polyurethane elastomer may contain 0.5 to 30% by weight, especially 1 to 25% by weight of an inorganic filler such as zinc oxide, barium sulfate, and titanium dioxide.
  • the outer cover layer should have a Shore D hardness of 30 to 55, preferably 35 to 54, more preferably 38 to 53. A Shore D hardness of less than 30 would detract from restitution whereas hitting feel would become too hard above 55.
  • the outer cover layer should preferably have a specific gravity of 1.05 to 1.4, especially 1.08 to 1.3.
  • the outer cover layer preferably has a gage of 0.5 to 2.5 mm, especially 1.0 to 2.3 mm.
  • the inner and outer cover layers preferably have a total gage (overall cover gage) of 1.0 to 5.5 mm, more preferably 1.5 to 5.0 mm, especially 1.5 to 3.5 mm.
  • an ionomer resin having a Shore D hardness of at least 55 is essential in the practice of the invention to mix an ionomer resin having a Shore D hardness of at least 55 with the thermoplastic polyester elastomer and/or the thermoplastic polyurethane elastomer.
  • Useful as the ionomer resin having a Shore D hardness of at least 55 are Himilan 1605 and Himilan 1706 by Mitsui duPont Polychemicals K.K.
  • the mixing of the ionomer resin having a Shore D hardness of at least 55 is effective for maintaining a good balance of hardness and resiliency. In contrast, such effects are not achievable by mixing an ionomer resin having a Shore D hardness of lower than 55.
  • the amount of the ionomer resin having a Shore D hardness of at least 55 blended is as described above while too large amounts prevent the elastomer from fully exerting its effect and too small amounts of the ionomer resin fail to achieve its addition effect
  • the inner and outer cover layers may be formed by well-known techniques such as injection molding and compression molding using half shells.
  • the multi-piece solid golf ball thus obtained should preferably have an inertia moment of at least 83 g-cm 2 , especially 83.5 to 87.0 g-cm 2 as measured by the method described later.
  • An inertia moment of less than 83 g-cm 2 would lead to the disadvantage that the ball rolling upon putting becomes unsustained.
  • the outer cover layer is formed with dimples in a conventional manner.
  • the golf ball of the invention is constructed in accordance with the Rules of Golf to a diameter of not less than 42.67 mm and a weight of not greater than 45.93 grams.
  • Solid cores of the composition shown in Table 1 were prepared.
  • Solid core composition (pbw) Example Comparative Example 1 2 3 4 5 1 2 3 4 5 6
  • Polybutadiene 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 Dicumyl peroxide 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 Barium sulfate 5 2.6 6.1 2.4 8.2 0 19 21.2 12.9 20.7 10 Zinc oxide 5 5 5 5 5 3.8 5 5 5 5 5 5 5
  • Antioxidant 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2
  • compositions f,g,h in Table 2 and F,G,H,I in Table are not according to the invention and were tested for comparative purposes only.
  • the golf balls were examined for inertia moment, flight distance, spin rate, feeling, scraping resistance, and consecutive durability by the following tests.
  • the results are shown in Tables 4, in accordance with the invention, and 5, showing the comparative examples.
  • the inertia moment is a value calculated from the diameters (gages) and specific gravities of the respective layers and it can be determined from the following equation on the assumption that the ball is spherical.
  • the specific gravity of the outer cover layer is lower than the specific gravity of the outer cover-forming resin itself because the dimples are present on the actual ball.
  • the specific gravity of the outer cover layer is herein designated a phantom outer cover layer specific gravity, which is used for the calculation of an inertia moment M.
  • M ( ⁇ /5880000)x ⁇ (r1-r2)xD1 5 + (r2-r3)xD2 5 + r3xD3 5 ⁇
  • the ball was hit with a driver (#W1, head speed 45 m/sec.) to measure a carry and total distance.
  • a spin rate was calculated from photographic analysis by photographing the behavior of the ball immediately after impact with #W1 and a sand wedge (#SW, head speed 20 m/sec.).
  • the ball was hit at two points with a sand wedge (#SW, head speed 38 m/sec.). The ball at the hit points was visually examined.
  • the ball was repeatedly hit at a head speed of 38 m/sec.
  • the ball was evaluated in terms of the number of hits repeated until the ball was broken.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Claims (10)

  1. Une balle de golf solide en plusieurs pièces comprenant un noyau solide et un revêtement possédant une couche intérieure et extérieure entourant le noyau, caractérisé en ce que ledit noyau solide subit une distorsion d'au moins 2,7 mm lorsqu'une charge de 100 kg lui est appliquée, ladite couche de revêtement intérieure est principalement constituée d'un élastomère polyester thermoplastique, ladite couche de revêtement extérieure est principalement constituée d'un élastomère polyuréthane thermoplastique, une ou plusieurs résines ionomère possédant une dureté Shore D d'au moins 55 sont mélangées soit avec l'élastomère polyester thermoplastique de ladite couche de revêtement intérieure ou avec l'élastomère polyuréthane thermoplastique de ladite couche de revêtement extérieure soit avec les deux élastomères, ladite couche de revêtement intérieure possède une dureté Shore D de 28 à 58, et ladite couche de revêtement extérieure possède une dureté Shore D de 30 à 55.
  2. La balle de golf de la revendication 1 possédant une couche de revêtement intérieure dans laquelle la résine ionomère possédant une dureté Shore D d'au moins 55 est mélangée dans une proportion de 3 à 70 parties en poids pour 100 parties en poids de l'élastomère polyester thermoplastique.
  3. La balle de golf de la revendication 1 ou 2 possédant une couche de revêtement extérieure dans laquelle la résine ionomère possédant une dureté Shore D d'au moins 55 est mélangée dans une proportion de 2 à 70 parties en poids pour 100 parties en poids de l'élastomère polyuréthane thermoplastique.
  4. La balle de golf selon une quelconque des revendications 1 à 3 dans laquelle la balle dans son ensemble possède un moment d'inertie d'au moins 83 g-cm2.
  5. La balle de golf selon une quelconque des revendications 1 à 4 dans laquelle 0,5 à 30% en poids d'une matière de charge inorganique est ajoutée à ladite couche de revêtement extérieure.
  6. La balle de golf selon une quelconque des revendications 1 à 5 dans laquelle ladite couche de revêtement intérieure contient 0 à 30% en poids d'une matière de charge inorganique.
  7. La balle de golf selon une quelconque des revendications 1 à 6 dans laquelle ladite couche de revêtement extérieure possède un poids spécifique de 1,05 à 1,4.
  8. La balle de golf selon une quelconque des revendications 1 à 7 dans laquelle ladite couche de revêtement intérieure possède un poids spécifique de 1,05 à 1,3.
  9. La balle de golf selon une quelconque des revendications 1 à 8 dans laquelle ledit noyau possède un poids spécifique de 0,9 à 1,2.
  10. La balle de golf selon une quelconque des revendications 1 à 9 dans laquelle ladite couche de revêtement extérieure possède une épaisseur de 0,5 à 2,5 mm, ladite couche de revêtement intérieure possède une épaisseur de 0,5 à 3,0 mm, et ledit revêtement possède une épaisseur totale de 1,0 à 5,5 mm.
EP19980306349 1997-08-08 1998-08-07 Balle de golf solide en plusieurs pièces Expired - Lifetime EP0895792B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP22760897 1997-08-08
JP227608/97 1997-08-08
JP22760897 1997-08-08
JP30797097 1997-10-22
JP30797097A JP3516124B2 (ja) 1997-08-08 1997-10-22 マルチピースソリッドゴルフボール
JP307970/97 1997-10-22

Publications (2)

Publication Number Publication Date
EP0895792A1 EP0895792A1 (fr) 1999-02-10
EP0895792B1 true EP0895792B1 (fr) 2003-06-11

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Family Applications (1)

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EP19980306349 Expired - Lifetime EP0895792B1 (fr) 1997-08-08 1998-08-07 Balle de golf solide en plusieurs pièces

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EP (1) EP0895792B1 (fr)
JP (1) JP3516124B2 (fr)
DE (1) DE69815450T2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3710080B2 (ja) * 1998-06-18 2005-10-26 ブリヂストンスポーツ株式会社 ソリッドゴルフボール
US6702695B1 (en) 1999-08-19 2004-03-09 Bridgestone Sports Co., Ltd. Multi-piece solid golf ball
JP2002186687A (ja) * 2000-12-22 2002-07-02 Bridgestone Sports Co Ltd マルチピースソリッドゴルフボール
US7744492B2 (en) 2007-07-31 2010-06-29 Bridgestone Sports Co., Ltd. Multi-piece solid golf ball
US7425182B1 (en) 2007-07-31 2008-09-16 Bridgestone Sports Co., Ltd. Multi-piece solid golf ball
US7959524B2 (en) 2007-07-31 2011-06-14 Bridgestone Sports Co., Ltd. Three-piece solid golf ball
US7946933B2 (en) 2007-10-31 2011-05-24 Bridgestone Sports Co., Ltd. Three-piece solid golf ball

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH078301B2 (ja) * 1986-05-23 1995-02-01 ブリヂストンスポーツ株式会社 ソリツドゴルフボ−ル
FR2666018A1 (fr) 1990-08-22 1992-02-28 Salomon Sa Balle de golf.
US5026067A (en) * 1990-11-08 1991-06-25 Gentiluomo Joseph A Golf ball
US5873796A (en) * 1990-12-10 1999-02-23 Acushnet Company Multi-layer golf ball comprising a cover of ionomer blends
JP2570587B2 (ja) 1992-08-31 1997-01-08 ブリヂストンスポーツ株式会社 マルチピースソリッドゴルフボール
US5439227A (en) * 1992-08-31 1995-08-08 Bridgestone Sports Co., Ltd. Multi-piece solid golf ball
JP2910516B2 (ja) 1993-07-08 1999-06-23 ブリヂストンスポーツ株式会社 スリーピースソリッドゴルフボール
JP2658811B2 (ja) * 1993-07-08 1997-09-30 ブリヂストンスポーツ株式会社 スリーピースソリッドゴルフボール
JP2924720B2 (ja) 1995-06-23 1999-07-26 ブリヂストンスポーツ株式会社 スリーピースソリッドゴルフボール

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JP3516124B2 (ja) 2004-04-05
EP0895792A1 (fr) 1999-02-10
DE69815450T2 (de) 2004-05-06
DE69815450D1 (de) 2003-07-17
JPH11104272A (ja) 1999-04-20

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