JP5854701B2 - 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 - Google Patents
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 Download PDFInfo
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- JP5854701B2 JP5854701B2 JP2011183080A JP2011183080A JP5854701B2 JP 5854701 B2 JP5854701 B2 JP 5854701B2 JP 2011183080 A JP2011183080 A JP 2011183080A JP 2011183080 A JP2011183080 A JP 2011183080A JP 5854701 B2 JP5854701 B2 JP 5854701B2
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- golf ball
- polyurethane composition
- polyurethane
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- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000001995 cyclobutyl group Chemical group [H]C1([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- 125000000582 cycloheptyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 125000000640 cyclooctyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C([H])([H])C1([H])[H] 0.000 description 1
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- 125000001559 cyclopropyl group Chemical group [H]C1([H])C([H])([H])C1([H])* 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- SZXQTJUDPRGNJN-UHFFFAOYSA-N dipropylene glycol Chemical compound OCCCOCCCO SZXQTJUDPRGNJN-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003480 eluent Substances 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000006081 fluorescent whitening agent Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
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- 125000005843 halogen group Chemical group 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
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- 229910052744 lithium Inorganic materials 0.000 description 1
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- 229910052700 potassium Inorganic materials 0.000 description 1
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- ULWHHBHJGPPBCO-UHFFFAOYSA-N propane-1,1-diol Chemical compound CCC(O)O ULWHHBHJGPPBCO-UHFFFAOYSA-N 0.000 description 1
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- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
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- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
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- 150000004072 triols Chemical class 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
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- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
Classifications
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- Chemical Kinetics & Catalysis (AREA)
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Description
log(E’/E”2)≧−6.08
log(E’/E”2)≧−6.08
前記log(E’/E”2)は、−6.01以上がより好ましい。また、前記log(E’/E”2)は、特に限定されないが、−3.00以下が好ましく、−3.20以下がより好ましい。前記log(E’/E”2)が−3.00になると、反発係数が最大値である1に近づくからである。前記log(E’/E”2)は、後述するポリウレタンエラストマーのポリイソシアネート成分、ポリオール成分、または、鎖延長剤成分の種類、含有量などを適宜選択することにより制御することができる。なお、上記式においてlogは常用対数である。
(1)スラブ硬度(JIS−A硬度、ショアD硬度)
ゴルフボール用ポリウレタン組成物を用いて、熱プレス成形により、厚み約2mmのシートを作製し、23℃で2週間保存した。このシートを、測定基板などの影響が出ないように、3枚以上重ねた状態で、スプリング式硬度計JIS−A型またはASTM−D2240に規定するスプリング式硬度計ショアD型を備えた高分子計器社製自動ゴム硬度計P1型を用いて測定した。
溶融粘度は、流動特性評価装置(島津製作所製、フローテスターCFT−500D)を用いて、ペレット状の試料について、下記条件で測定した。
測定条件
ダイ長さ:10mm
ダイ穴径:1mm
シリンダー圧力:3MPa
温度:190℃
ゴルフボール用ポリウレタン組成物を用いて、熱プレス成形にて厚み約2mmのシートを作製し、当該シートから直径28mmの円形状に打抜いたものを6枚重ねることにより、厚さ約12mm、直径28mmの円柱状試験片を作製した。この試験片についてリュプケ式反発弾性試験(試験温湿度23℃、50RH%)を行った。なお、試験片の作製および試験方法は、JIS K6255に準じて行った。
球形体に初期荷重98Nを負荷した状態から終荷重1275Nを負荷したときまでの圧縮方向の変形量(圧縮方向に球形体が縮む量)を測定した。圧縮変形量は、ゴルフボールNo.20の圧縮変形量を1.00として指数化した値で示した。
各球形体に198.4gの金属製円筒物を40m/秒の速度で衝突させ、衝突前後の円筒物および球形体の速度を測定し、それぞれの速度および重量から各球形体の反発係数を算出した。測定は、各球形体について12個ずつ行って、その平均値を各球形体の反発係数とした。
アマチュアゴルファー(上級者)10人により、ドライバーを用いた実打テストを行って、各人の打撃時のフィーリングを下記基準で評価させた。10人の評価のうち、最も多い評価をそのゴルフボールの打球感とした。
評価基準
優:衝撃が少なくてフィーリングが良い。
良:普通。
不良:衝撃が大きくてフィーリングが悪い。
ゴルフボール用ポリウレタン組成物の貯蔵弾性率E’(Pa)および損失弾性率E”(Pa)を以下の条件で測定した。
装置:ユービーエム社製動的粘弾性測定装置Rheogel−E4000
測定サンプル:ゴルフボール用ポリウレタン組成物から、熱プレス成形により厚み2mmのシートを作製し、このシートから、幅4mm、クランプ間距離20mmになるように試料片を切り出した。
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%
デスモジュール(登録商標)Wを、3〜4℃で91時間保存した後、室温にてヌッチェを用いて4時間かけてろ過を行った。ヌッチェ上の物を回収してフラスコに仕込み、90℃に昇温して完全に溶融させた後、10時間かけて45℃まで徐冷して、45℃で8時間保存し、さらに24時間かけて室温まで徐冷した。室温まで徐冷したものを、ヌッチェを用いて3時間かけてろ過を行った。ヌッチェ上の物を回収してフラスコに仕込み、70℃に昇温して1時間保持した後、液体成分を除去した。さらに、80℃に昇温して1時間保持した後、液体成分を除去することにより、トランス,トランス体の含有率が95モル%であるH12MDIを得た。得られたトランス,トランス体の含有率が95モル%であるH12MDIと、デスモジュール(登録商標)Wとを混合することにより、表1〜3に記載のトランス,トランス体の含有率のH12MDIを調製した。なお、H12MDI中のトランス,トランス体の含有率は、ガスクロマトグラフィー(島津製作所製、型番「GC−2010」)を用いて、下記条件で測定した。
(ガスクロマトグラフィー測定条件)
カラム:DB−1(島津製作所社製)、30m×0.25mm×0.25μm、
温度:150℃で2分保持、5℃/minで250℃まで昇温、10℃/minで300℃まで昇温、300℃で3分保持
インジェクション温度:280℃
ディテクタ温度:280℃
キャリアガス:ヘリウム、流量:2ml/min
表1〜表3に示した組成比を有するポリウレタンエラストマーを、以下のようにして合成した。80℃に加熱した4,4’−ジシクロヘキシルメタンジイソシアネート(H12MDI)に、80℃に加熱したポリテトラメチレンエーテルグリコール(PTMG2000)を投入し、さらに、原料(H12MDI、PTMG2000およびBD)の総量の0.005質量%のジブチルチンジラウレート(アルドリッチ社製)を投入した後、窒素気流下にて、80℃で2時間撹拌を行った。続いて、窒素気流下にて、80℃に加熱した1,4−ブタンジオール(BD)を投入した後、80℃で1分間撹拌を行った。その後、反応液を冷却して、室温にて1分間減圧することにより系中の脱気を行った。脱気後の反応液を、容器に延展し、窒素雰囲気下、110℃にて6時間保存することにより、鎖延長反応を行いポリウレタンエラストマーを得た。
上記のようにして得られたポリウレタンエラストマーを、二軸混練型押出機により、ストランド状に冷水中に押し出した。押出されたストランドをペレタイザーにより切断してペレット状のゴルフボール用ポリウレタン組成物を調製した。押出条件は、スクリュー径45mm、スクリュー回転数200rpm、スクリューL/D=35であり、配合物は、押出機のダイの位置で160〜230℃に加熱された。得られたペレット状のゴルフボール用ポリウレタン組成物を220℃にて射出成形し、直径40mmの球形体(コア)を得た。
PTMG2000:BASFジャパン社製ポリテトラメチレンエーテルグリコール(数平均分子量2000)
BD:東京化成工業社製1,4−ブタンジオール
log(E’/E”2)≧−6.08
Claims (9)
- 樹脂成分として、ポリウレタンエラストマーを含有し、
前記ポリウレタンエラストマーは、ポリイソシアネート成分として、4,4’−ジシクロヘキシルメタンジイソシアネートを含有し、
前記4,4’−ジシクロヘキシルメタンジイソシアネートのうちの50モル%以上がトランス,トランス体であり、
動的粘弾性装置を用いて、加振周波数10Hz、温度0℃、測定ひずみ0.05%の条件で、引張モードで測定したときに、貯蔵弾性率E’(Pa)と損失弾性率E”(Pa)とが、下記式を満足することを特徴とするゴルフボール用ポリウレタン組成物。
log(E’/E”2)≧−6.08 - 前記ポリウレタンエラストマーが、ポリオール成分として、ポリテトラメチレンエーテルグリコールを含有する請求項1に記載のゴルフボール用ポリウレタン組成物。
- 前記ポリテトラメチレンエーテルグリコールの数平均分子量が、1000〜3000である請求項2に記載のゴルフボール用ポリウレタン組成物。
- 前記ポリウレタンエラストマーが、鎖長延長剤成分として、1,4−ブタンジオールを含有する請求項1〜3のいずれか一項に記載のゴルフボール用ポリウレタン組成物。
- 前記貯蔵弾性率E’が、1×10 5 Pa〜50×10 7 Paである請求項1〜4のいずれか一項に記載のゴルフボール用ポリウレタン組成物。
- 反発弾性が58%以上である請求項1〜5のいずれか一項に記載のゴルフボール用ポリウレタン組成物。
- 請求項1〜6のいずれか一項に記載のゴルフボール用ポリウレタン組成物から形成された構成部材を有することを特徴とするゴルフボール。
- 少なくとも一層以上のコアと前記コアを被覆するカバーとを有するゴルフボールであって、
前記コアの少なくとも一層が、請求項1〜6のいずれか一項に記載のゴルフボール用ポリウレタン組成物から形成されていることを特徴とするゴルフボール。 - ゴルフボール本体が、請求項1〜6のいずれか一項に記載のゴルフボール用ポリウレタン組成物から形成されていることを特徴とするワンピースゴルフボール。
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