JP2012139401A - ゴルフボール - Google Patents
ゴルフボール Download PDFInfo
- Publication number
- JP2012139401A JP2012139401A JP2010294351A JP2010294351A JP2012139401A JP 2012139401 A JP2012139401 A JP 2012139401A JP 2010294351 A JP2010294351 A JP 2010294351A JP 2010294351 A JP2010294351 A JP 2010294351A JP 2012139401 A JP2012139401 A JP 2012139401A
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- Prior art keywords
- golf ball
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- core
- 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.)
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Abstract
【解決手段】ゴルフボール2は、コア4と、中間層6と、カバー8とを備えている。コア4は、センター10と包囲層12とを備えている。ゴルフボール2の仮想球の体積に対する、コア4の体積Veの比率は、76%以上である。センター10の圧縮変形量Coと、このセンター10の直径Doとの比(Co/Do)は、0.085以上0.130以下である。コア4の圧縮変形量Ceと、このコア4の直径Deとの比(Ce/De)は、0.015以上0.020以下である。
【選択図】図1
Description
小さなスピン速度と大きな打ち出し角度とが達成されうる。
装置:TAインスツルメント社の「レオメータARES」
測定モード:捻り(剪断)
測定温度:0℃
加振周波数:10Hz
測定ひずみ:0.1%
装置:ユービーエム社の動的粘弾性測定装置「Rheogel−E4000」
測定モード:引張
測定温度:0℃
加振周波数:10Hz
測定ひずみ:0.1%
装置:HLC−8120GPC(東ソー社)
溶離液:テトラヒドロフラン
濃度:0.2質量%
温度:40℃
カラム:TSKgel SuperHM−M(東ソー社)
サンプル量:5マイクロリットル
流速:0.5ミリリットル/min
標準物質:ポリスチレン(東ソー社の「PStQuick Kit−H」)
100質量部のハイシスポリブタジエン(JSR社の商品名「BR−730」)、18質量部のアクリル酸亜鉛、5質量部の酸化亜鉛、適量の硫酸バリウム、0.5質量部のジフェニルジスルフィド及び0.7質量部のジクミルパーオキサイドを混練し、ゴム組成物(3)を得た。このゴム組成物(3)を共に半球状キャビティを備えた上型及び下型からなる金型に投入し、170℃の温度下で15分間加熱して、直径が18mmであるセンターを得た。
センター、包囲層、中間層及びカバーの仕様を下記の表4から7に示される通りとした他は実施例1と同様にして、実施例2から8及び比較例1から6のゴルフボールを得た。センターのゴム組成物の詳細が、下記の表1に示されている。包囲層のゴム組成物の詳細が、下記の表2に示されている。カバーの樹脂組成物の詳細が、下記の表3に示されている。
ゴルフラボラトリー社のスイングマシンに、5番アイアン(SRIスポーツ社の商品名「SRIXON Z−TX(スチールシャフト)」)を装着した。ヘッド速度が41m/secである条件で、ゴルフボールを打撃した。打撃直後のボール速度及びスピン速度、並びに発射地点から静止地点までの距離を測定した。12回測定されて得られたデータの平均値(飛距離I)が、下記の表4から7に示されている。測定時は、ほぼ無風であった。さらに、同じマシン条件にて、向かい風のコンディション下において、発射地点から静止地点までの距離を測定した。12回測定されて得られたデータの平均値(飛距離II)が、下記の表4から7に示されている。
上記スイングマシンに、サンドウェッジ(SRIスポーツ社の商品名「CG15 クロムウェッジ、ロフト角:58°」)を装着した。ヘッド速度が21m/secである条件でゴルフボールを打撃して、打撃直後のスピン速度を測定した。12回測定されて得られたデータの平均値が、下記の表4から7に示されている。さらに、クラブフェイスとボールとに水を付着させてゴルフボールを打撃し、打撃直後のスピン速度を測定した。12回測定されて得られたデータの平均値が、下記の表4から7に示されている。
10名のゴルファーにサンドウェッジにてゴルフボールを打撃させ、打球感を聞き取った。「打球感が良好」と答えたゴルファーの数に基づき、下記の格付けを行った。
A:8人以上
B:6−7人
C:4−5人
D:3人以下
この結果が、下記の表4から7に示されている。
ポリウレタン#1
BASFジャパン社の商品名「エラストランXNY97A」
ポリオール成分:ポリテトラメチレンエーテルグリコール
ポリオール成分の数平均分子量:1800
ポリウレタン#2
熱可塑性ポリウレタンエラストマー
ポリオール成分:ポリテトラメチレンエーテルグリコール
ポリオール成分の数平均分子量:1500
4・・・コア
6・・・中間層
8・・・カバー
10・・・センター
12・・・包囲層
14・・・ディンプル
16・・・ランド
Claims (10)
- コアと、このコアの外側に位置する中間層と、この中間層の外側に位置するカバーとを備えており、このコアが、センターと、このセンターの外側に位置する包囲層とを有しているゴルフボールであって、
上記ゴルフボールの仮想球の体積に対する、上記コアの体積Veの比率が、76%以上であり、
初荷重が98Nであり終荷重が294Nである条件で測定された上記センターの圧縮変形量Coと、このセンターの直径Doとの比(Co/Do)が、0.085以上0.130以下であり、
初荷重が98Nであり終荷重が294Nである条件で測定された上記コアの圧縮変形量Ceと、このコアの直径Deとの比(Ce/De)が、0.015以上0.020以下であるゴルフボール。 - 上記カバーのJIS−C硬度Hcがセンターの中心のJIS−C硬度Hoよりも小さい請求項1に記載のゴルフボール。
- 上記センターの体積Voと上記コアの体積Veとの比(Vo/Ve)が0.01以上0.13以下である請求項2に記載のゴルフボール。
- 上記カバーのJIS−C硬度Hcが65以下である請求項1から3のいずれいかに記載のゴルフボール。
- 上記カバーの厚みが0.8mm以下である請求項1から4のいずれかに記載のゴルフボール。
- 上記中間層のJIS−C硬度Hmが90以上である請求項1から5のいずれかに記載のゴルフボール。
- 上記中間層の厚みが1.5mm以下である請求項1から6のいずれかに記載のゴルフボール。
- 上記カバーが樹脂組成物からなり、加振周波数が10Hzであり温度が0℃である条件下で測定された上記樹脂組成物の剪断損失弾性率G”が、1.95×107Pa以下であり、
加振周波数が10Hzであり温度が0℃である条件下で測定された上記樹脂組成物の引張損失弾性率E”の、上記剪断損失弾性率G”に対する比(E”/G”)が、1.76以上である請求項1から7のいずれかに記載のゴルフボール。 - 上記カバーが樹脂組成物からなり、この樹脂組成物の基材の主成分が熱可塑性ポリウレタンである請求項1から8のいずれかに記載のゴルフボール。
- 上記熱可塑性ポリウレタンのポリオール成分が、数平均分子量が1500以下であるポリテトラメチレンエーテルグリコールである請求項9に記載のゴルフボール。
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US10639523B2 (en) | 2018-02-20 | 2020-05-05 | Bridgestone Sports Co., Ltd. | Multi-piece solid golf ball |
US10758786B2 (en) | 2017-11-09 | 2020-09-01 | Bridgestone Sports Co., Ltd. | Multi-piece solid golf ball |
US10967226B2 (en) | 2017-11-09 | 2021-04-06 | Bridgestone Sports Co., Ltd. | Multi-piece solid golf ball |
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US10758786B2 (en) | 2017-11-09 | 2020-09-01 | Bridgestone Sports Co., Ltd. | Multi-piece solid golf ball |
US10967226B2 (en) | 2017-11-09 | 2021-04-06 | Bridgestone Sports Co., Ltd. | Multi-piece solid golf ball |
US10639523B2 (en) | 2018-02-20 | 2020-05-05 | Bridgestone Sports Co., Ltd. | Multi-piece solid golf ball |
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