JP2017104370A - ゴルフボール - Google Patents
ゴルフボール Download PDFInfo
- Publication number
- JP2017104370A JP2017104370A JP2015241859A JP2015241859A JP2017104370A JP 2017104370 A JP2017104370 A JP 2017104370A JP 2015241859 A JP2015241859 A JP 2015241859A JP 2015241859 A JP2015241859 A JP 2015241859A JP 2017104370 A JP2017104370 A JP 2017104370A
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- Prior art keywords
- golf ball
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- A—HUMAN NECESSITIES
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Abstract
【解決手段】ゴルフボール2は、コア4、中間層6及びカバー8備える。コア4における表面と中心点との硬度の差DH、中間層6における厚みTm及び硬度Hm、カバー8における厚みTc及び硬度Hc、並びにゴルフボール2の圧縮変形量Sbは、下記数式を満たす。(DH・Hm)/(Hc・Tc)>80、((Sb・Tc)/(Hc・Hm・Tm))・1000>0.75。カバー8の硬度Hcは、40以下である。カバー8の材質は、樹脂組成物である。この樹脂組成物は、ポリウレタン(A)及びポリロタキサン(B)を含む。
【選択図】図1
Description
(DH ・ Hm) / (Hc ・ Tc) > 80 (1)
((Sb ・ Tc) / (Hc ・ Hm ・Tm)) ・ 1000 > 0.75 (2)
カバーの硬度Hcは、40以下である。カバーの材質は、樹脂組成物である。この樹脂組成物は、
ポリウレタン(A)及びポリロタキサン(B)を含む。このポリロタキサン(B)は、シクロデキストリン、このシクロデキストリンの環状構造を貫通する直鎖状分子、及びこの直鎖状分子の両末端に配置されシクロデキストリンの脱離を防止する封鎖基を有する。このポリロタキサン(B)では、シクロデキストリンの水酸基の少なくとも一部は、−O−C3H6−O−基を介してカプロラクトン鎖によって変性されている。
(A)ポリウレタン
及び
(B)ポリロタキサン
を含む。このポリロタキサン(B)は、シクロデキストリン、このシクロデキストリンの環状構造を貫通する直鎖状分子、及びこの直鎖状分子の両末端に配置されシクロデキストリンの脱離を防止する封鎖基を有する。このポリロタキサン(B)では、シクロデキストリンの水酸基の少なくとも一部が、−O−C3H6−O−基を介してカプロラクトン鎖によって変性されている。
(A1)ポリイソシアネート成分と高分子量ポリオール成分とを含むポリウレタン、
(A2)ポリイソシアネート成分と高分子量ポリオール成分と低分子量ポリオールとを含むポリウレタン、
(A3)ポリイソシアネート成分と高分子量ポリオール成分とポリアミン成分とを含むポリウレタン、
及び
(A4)ポリイソシアネート成分と高分子量ポリオール成分と低分子量ポリオール成分とポリアミン成分とを含むポリウレタン
が例示される。
測定モード:引張
測定温度:0℃
加振周波数:10Hz
測定ひずみ:0.05%
測定のための試料片の、幅は4mmであり、クランプ間距離は20mmである。この試料片は、シートから切り出される。このシートの厚みは、0.5mmでる。このシートは、熱プレスによって該ポリウレタンから成形される。
標準物質:ポリスチレン
溶離液:テトラヒドロフラン
カラム:有機溶媒系GPC用カラム
(昭和電工社の「Shodex KFシリーズ」)
測定モード:引張
測定温度:0℃
加振周波数:10Hz
測定ひずみ:0.05%
測定のための試料片の、幅は4mmであり、クランプ間距離は20mmである。この試料片は、シートから切り出される。このシートの厚みは、0.5mmでる。このシートは、熱プレスによって、カバー8の樹脂組成物と同じ樹脂組成物から成形される。
V1 = (DH ・ Hm) / (Hc ・ Tc)
換言すれば、このゴルフボール2は、下記数式(1)を満たす。
(DH ・ Hm) / (Hc ・ Tc) > 80 (1)
本発明者が得た知見によれば、値V1は、ドライバーショットでのスピン速度と相関する。上記数式(1)を満たすゴルフボール2では、ドライバーショットでのスピンが抑制される。このゴルフボール2は、ドライバーショットでの飛行性能に優れる。この観点から、値V1は90以上がより好ましく、100以上が特に好ましい。打球感の観点及びコントロール性能の観点から、値V1は135以下が好ましい。
V2 = ((Sb ・ Tc) / (Hc ・ Hm ・Tm)) ・ 1000)
換言すれば、このゴルフボール2は、下記数式(2)を満たす。
((Sb ・ Tc) / (Hc ・ Hm ・Tm)) ・ 1000 > 0.75 (2)
本発明者が得た知見によれば、値V2は、ドライバーショットでの打球感と相関する。上記数式(2)を満たすゴルフボール2では、ドライバーショットにおいてソフトな打球感が得られる。さらに値V2は、ウエット状態にてショートアイアンで打撃されたときのコントロール性能と相関する。上記数式(2)を満たすゴルフボール2は、コントロール性能に優れる。これらの観点から、値V2は0.81以上がより好ましく、0.90以上が特に好ましい。飛行性能の観点から、値V2は1.30以下が好ましい。
100質量部のハイシスポリブタジエン(JSR社の商品名「BR−730」)、29.5質量部のアクリル酸亜鉛、12質量部の酸化亜鉛、適量の硫酸バリウム、0.1質量部の2−ナフタレンチオール、0.3質量部のペンタブロモジフェニルジスルフィド、0.85質量部のジクミルパーオキサイド及び2質量部の安息香酸を混練し、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、150℃で20分間加熱して、直径が39.7mmであるコアを得た。所定のボール質量が得られるよう、硫酸バリウムの量を調整した。
コア、中間層及びカバーの仕様を下記の表7−12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2−10並びに比較例1−7及び9−17のゴルフボールを得た。コアの仕様の詳細が、下記の表1に示されている。中間層の仕様の詳細が、下記の表2に示されている。カバーの仕様の詳細が、下記の表3に示されている。比較例8では、カバーの成形ができなかった。
ゴルフラボラトリー社のスイングマシンに、ドライバー(ダンロップスポーツ社の商品名「Z745」、シャフト硬度:S、ロフト角:8.5°)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て、ボール速度、スピン速度及び飛距離を測定した。飛距離は、打撃地点とボールが静止した地点との距離である。12回の測定で得られたデータの平均値が、下記の表7−12に示されている。
ゴルフラボラトリー社製スイングマシンに、ウエッジ(クリーブランドゴルフ社の商品名「RTX588BLD」、ロフト角:58°)を装着した。ゴルフクラブのフェース及びゴルフボールを水で濡らした後、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、スピン速度を測定した。12回の測定で得られた値の平均を、算出した。各ゴルフボールの平均の、比較例1に係るゴルフボールの平均との差が、下記の表7−12に示されている。
30名のプレーヤーにドライバー(ダンロップスポーツ社の商品名「Z745」、シャフト硬度:S、ロフト角:8.5°)にてゴルフボールを打撃させ、フィーリングを聞き取った。「フィーリングが良好」と答えたプレーヤーの数に基づき、下記の格付けを行った。
A:25人以上
B:20−24人
C:15−19人
D:14人以下
この結果が、下記の表7−12に示されている。
エラストランNY80A
ショアA硬度:80
損失弾性率E”:1.43・107Pa
エラストランNY82A
ショアA硬度:82
損失弾性率E”:2.72・107Pa
エラストランNY84A
ショアA硬度:84
損失弾性率E”:3.91・107Pa
エラストランNY86A
ショアA硬度:86
損失弾性率E”:4.20・107Pa
エラストランNY88A
ショアA硬度:88
損失弾性率E”:4.50・107Pa
エラストランNY90A
ショアA硬度:90
損失弾性率E”:5.37・107Pa
エラストランNY95A
ショアA硬度:95
損失弾性率E”:5.65・107Pa
エラストラン1190ATR
ショアA:硬度90
損失弾性率E”:1.26・107Pa
4・・・コア
6・・・中間層
8・・・カバー
10・・・ディンプル
12・・・ランド
Claims (6)
- 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たゴルフボールであって、
上記コアにおける表面と中心点とのショアC硬度の差DH、上記中間層における厚みTm(mm)及びショアD硬度Hm、上記カバーにおける厚みTc(mm)及びショアD硬度Hc、並びに上記ゴルフボールの圧縮変形量Sb(mm)が、下記数式(1)及び(2)を満たし、
(DH ・ Hm) / (Hc ・ Tc) > 80 (1)
((Sb ・ Tc) / (Hc ・ Hm ・Tm)) ・ 1000 > 0.75 (2)
上記カバーの硬度Hcが40以下であり、
上記カバーの材質が樹脂組成物であり、
上記樹脂組成物が、
(A)ポリウレタン
並びに
(B)シクロデキストリン、このシクロデキストリンの環状構造を貫通する直鎖状分子、及びこの直鎖状分子の両末端に配置され上記シクロデキストリンの脱離を防止する封鎖基を有し、かつ、上記シクロデキストリンの水酸基の少なくとも一部が−O−C3H6−O−基を介してカプロラクトン鎖によって変性されたポリロタキサン
を含むゴルフボール。 - 上記中間層の硬度Hmが55以上である請求項1に記載のゴルフボール。
- 上記直鎖状分子がポリエチレングリコールであり、上記封鎖基がアダマンチル基である請求項1又は2に記載のゴルフボール。
- 上記カバーの樹脂組成物におけるポリロタキサン(B)の量が、100質量部のポリウレタン(A)に対し、1質量部以上50質量部以下である請求項1から3のいずれかに記載のゴルフボール。
- 上記ポリウレタン(A)の損失弾性率E”が、5.0・107Pa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。
- 上記カバーの損失弾性率E”が、5.0・107Pa以下である請求項1から5のいずれかに記載のゴルフボール。
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| JP2013042958A (ja) * | 2011-08-24 | 2013-03-04 | Dunlop Sports Co Ltd | ゴルフボール用ポリウレタン組成物およびゴルフボール |
| JP2013230363A (ja) * | 2012-05-01 | 2013-11-14 | Bridgestone Sports Co Ltd | ゴルフボール |
| JP2013248298A (ja) * | 2012-06-01 | 2013-12-12 | Dunlop Sports Co Ltd | ゴルフボール |
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| JP3554408B2 (ja) * | 1995-07-07 | 2004-08-18 | 住友ゴム工業株式会社 | ゴルフボールの製造方法 |
| US7053142B2 (en) * | 2003-12-19 | 2006-05-30 | Acushnet Company | Plasticized polyurethanes for use in golf balls |
| ATE474020T1 (de) * | 2004-01-08 | 2010-07-15 | Univ Tokyo | Verbindung mit vernetztem polyrotaxan und herstellungsverfahren dafür |
| JP4927930B2 (ja) * | 2009-12-16 | 2012-05-09 | Sriスポーツ株式会社 | ゴルフボール用材料およびこれを用いたゴルフボール |
| JP5424990B2 (ja) | 2010-06-10 | 2014-02-26 | ブリヂストンスポーツ株式会社 | ゴルフボール |
| JP5484261B2 (ja) | 2010-08-27 | 2014-05-07 | ダンロップスポーツ株式会社 | ゴルフボールカバー用材料およびこれを用いたゴルフボール |
| JP5545345B2 (ja) | 2012-11-22 | 2014-07-09 | ブリヂストンスポーツ株式会社 | ゴルフボール |
| EP3006480B1 (en) * | 2013-06-07 | 2019-02-06 | Advanced Softmaterials Inc. | Crosslinking composition having a polyrotaxane and a compound having two or more oxirane groups and/or oxetane groups |
| EP3246362B1 (en) * | 2015-01-13 | 2020-06-24 | Advanced Softmaterials Inc. | Thermoplastic elastomer composition, thermoplastic elastomer, and method for producing thermoplastic elastomer |
| JP6638374B2 (ja) * | 2015-12-17 | 2020-01-29 | 住友ゴム工業株式会社 | ゴルフボール |
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| WO2005095493A1 (ja) * | 2004-03-31 | 2005-10-13 | The University Of Tokyo | ポリロタキサンを有するポリマー材料、並びにその製造方法 |
| JP2007106860A (ja) * | 2005-10-13 | 2007-04-26 | Nissan Motor Co Ltd | ポリロタキサン含有自動車用着色プラスチック |
| JP2012130524A (ja) * | 2010-12-22 | 2012-07-12 | Dunlop Sports Co Ltd | ゴルフボール |
| JP2012223286A (ja) * | 2011-04-18 | 2012-11-15 | Dunlop Sports Co Ltd | ゴルフボール |
| JP2013009814A (ja) * | 2011-06-29 | 2013-01-17 | Dunlop Sports Co Ltd | ゴルフボール |
| JP2013042958A (ja) * | 2011-08-24 | 2013-03-04 | Dunlop Sports Co Ltd | ゴルフボール用ポリウレタン組成物およびゴルフボール |
| JP2013230363A (ja) * | 2012-05-01 | 2013-11-14 | Bridgestone Sports Co Ltd | ゴルフボール |
| JP2013248298A (ja) * | 2012-06-01 | 2013-12-12 | Dunlop Sports Co Ltd | ゴルフボール |
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| JP6724356B2 (ja) | 2020-07-15 |
| US10232226B2 (en) | 2019-03-19 |
| US20170165530A1 (en) | 2017-06-15 |
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