JP5547162B2 - ゴルフボール - Google Patents
ゴルフボール Download PDFInfo
- Publication number
- JP5547162B2 JP5547162B2 JP2011241814A JP2011241814A JP5547162B2 JP 5547162 B2 JP5547162 B2 JP 5547162B2 JP 2011241814 A JP2011241814 A JP 2011241814A JP 2011241814 A JP2011241814 A JP 2011241814A JP 5547162 B2 JP5547162 B2 JP 5547162B2
- Authority
- JP
- Japan
- Prior art keywords
- intermediate layer
- hardness
- less
- cover
- golf ball
- 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 - Fee Related
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- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical group CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 1
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Images
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- Compositions Of Macromolecular Compounds (AREA)
Description
80質量部のポリブタジエン(JSR社の商品名「BR−730」)、20質量部の他のポリブタジエン(JSR社の商品名「BR−51」)、27.0質量部のアクリル酸亜鉛(日本触媒社の商品名「ZN−DA90S」)、5.0質量部の酸化亜鉛(三井金属社の商品名「酸化亜鉛2種」)、0.8質量部のジクミルパーオキサイド(日本油脂社)、0.5質量部のジフェニルジスルフィド(住友精化社)及び17.4質量部の硫酸バリウムを混練し、ゴム組成物を得た。このゴム組成物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38.6mmである内球を得た。
材質、内球の直径、第一中間層の厚みTf、第二中間層の厚みTs及びカバーの厚みTcを下記の表1から6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10及び比較例1から3のゴルフボールを得た。
ゴルフラボラトリー社のスイングマシンに、メタルヘッドを備えたドライバーを装着した。ヘッド速度が50m/secである条件でゴルフボールを打撃し、打撃直後のボール速度及びスピン速度並びに飛距離(発射地点から静止地点までの距離)を測定した。10回の測定の平均値が、下記の表4から6に示されている。
上記スイングマシンに、アプローチウエッジを装着した。ヘッド速度が21m/secとなるようにマシン条件を設定し、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。10回の測定の平均値を算出した。さらに、10回の測定の最大値と最小値との幅を算出し、下記の基準に基づいて格付けを行った。
A:幅が100rpm未満である
B:幅が100rpm以上200rpm未満である
C:幅が200rpm以上である
これらの結果が、下記の表4から6に示されている。
上級ゴルファーに、ドライバーでゴルフボールを打撃させた。このゴルファーに、下記の基準に基づき打球感を格付けさせた。
A:衝撃が小さくて良好
B:普通
C:衝撃が大きくて不良
この結果が、下記の表4から6に示されている。
上記スイングマシンに、ピッチングウエッジを装着した。ヘッド速度が36m/secとなるようにマシン条件を設定し、ゴルフボールを打撃した。このゴルフボールの表面を目視観察し、下記の基準に基づき格付けした。
A:傷がほとんどない
B:傷があり、毛羽がある
C:大きな傷があり、毛羽が目立つ
この結果が、下記の表4から6に示されている。
4・・・コア
6・・・補強層
8・・・カバー
10・・・内球
12・・・第一中間層
14・・・第二中間層
16・・・ディンプル
18・・・ランド
Claims (6)
- 球状のコアと、このコアの外側に位置しかつ熱可塑性樹脂組成物からなるカバーとを備えており、
このコアが、内球と、この内球の外側に位置しかつ熱可塑性樹脂組成物からなる第一中間層と、この第一中間層の外側に位置しかつ熱可塑性樹脂組成物からなる第二中間層とを備えており、
この第二中間層のショアD硬度Hsが、第一中間層のショアD硬度Hf及びカバーのショアD硬度Hcよりも大きく、
このカバーのショアD硬度Hcが18以上38以下であり、
このカバーのショアD硬度Hcが内球の中心のショアD硬度Hiよりも小さく、
この硬度Hiと硬度Hcとの差(Hi−Hc)が4以上であり、
このカバーの、厚みTc(mm)とショアD硬度Hcとの積(Tc・Hc)が25以下であり、
このカバーの厚みTcが0.3mm以上0.8mm以下であるゴルフボール。 - 上記第一中間層の厚みTf、第二中間層の厚みTs及びカバーの厚みTcの和(Tf+Ts+Tc)が0.5mm以上3.7mm以下である請求項1に記載のゴルフボール。
- 上記カバーのショアD硬度Hcに対する第二中間層のショアD硬度Hsの比(Hs/Hc)が1.4以上3.7以下である請求項1又は2に記載のゴルフボール。
- 上記第二中間層のショアD硬度Hsと第一中間層のショアD硬度Hfとの差(Hs−Hf)が3以上である請求項1から3のいずれかに記載のゴルフボール。
- 上記第一中間層の基材ポリマーの主成分がアイオノマー樹脂であり、
上記第二中間層の基材ポリマーの主成分がアイオノマー樹脂であり、
上記カバーの基材ポリマーの主成分が熱可塑性ポリウレタンエラストマーである請求項1から4のいずれかに記載のゴルフボール。 - 上記第二中間層とカバーとの間に、厚みが3μm以上50μm以下である補強層をさらに備えた請求項1から5のいずれかに記載のゴルフボール。
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