JP2020185067A - ゴルフボール - Google Patents
ゴルフボール Download PDFInfo
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- JP2020185067A JP2020185067A JP2019089955A JP2019089955A JP2020185067A JP 2020185067 A JP2020185067 A JP 2020185067A JP 2019089955 A JP2019089955 A JP 2019089955A JP 2019089955 A JP2019089955 A JP 2019089955A JP 2020185067 A JP2020185067 A JP 2020185067A
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- 239000005060 rubber Substances 0.000 claims abstract description 73
- 239000000203 mixture Substances 0.000 claims abstract description 64
- 229910052751 metal Inorganic materials 0.000 claims abstract description 37
- 239000002184 metal Substances 0.000 claims abstract description 37
- 150000003839 salts Chemical class 0.000 claims abstract description 29
- 150000002989 phenols Chemical class 0.000 claims abstract description 21
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 18
- 238000004132 cross linking Methods 0.000 claims abstract description 12
- 239000003999 initiator Substances 0.000 claims abstract description 11
- 125000000524 functional group Chemical group 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 7
- 125000004432 carbon atom Chemical group C* 0.000 claims description 25
- 150000001875 compounds Chemical class 0.000 claims description 22
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 10
- 235000010354 butylated hydroxytoluene Nutrition 0.000 claims description 6
- FYPMFJGVHOHGLL-UHFFFAOYSA-N probucol Chemical compound C=1C(C(C)(C)C)=C(O)C(C(C)(C)C)=CC=1SC(C)(C)SC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 FYPMFJGVHOHGLL-UHFFFAOYSA-N 0.000 claims description 5
- SPSPIUSUWPLVKD-UHFFFAOYSA-N 2,3-dibutyl-6-methylphenol Chemical compound CCCCC1=CC=C(C)C(O)=C1CCCC SPSPIUSUWPLVKD-UHFFFAOYSA-N 0.000 claims description 4
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 4
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 claims description 3
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 3
- VNQNXQYZMPJLQX-UHFFFAOYSA-N 1,3,5-tris[(3,5-ditert-butyl-4-hydroxyphenyl)methyl]-1,3,5-triazinane-2,4,6-trione Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CN2C(N(CC=3C=C(C(O)=C(C=3)C(C)(C)C)C(C)(C)C)C(=O)N(CC=3C=C(C(O)=C(C=3)C(C)(C)C)C(C)(C)C)C2=O)=O)=C1 VNQNXQYZMPJLQX-UHFFFAOYSA-N 0.000 claims description 2
- WPMYUUITDBHVQZ-UHFFFAOYSA-M 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=CC(CCC([O-])=O)=CC(C(C)(C)C)=C1O WPMYUUITDBHVQZ-UHFFFAOYSA-M 0.000 claims description 2
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- WJQOZHYUIDYNHM-UHFFFAOYSA-N 2-tert-Butylphenol Chemical compound CC(C)(C)C1=CC=CC=C1O WJQOZHYUIDYNHM-UHFFFAOYSA-N 0.000 claims 1
- 150000007934 α,β-unsaturated carboxylic acids Chemical class 0.000 abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
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- 239000010410 layer Substances 0.000 description 17
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- 229920005989 resin Polymers 0.000 description 14
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 12
- 150000002898 organic sulfur compounds Chemical class 0.000 description 12
- 238000007906 compression Methods 0.000 description 11
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- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 10
- 239000005063 High cis polybutadiene Substances 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 9
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- 238000000034 method Methods 0.000 description 8
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- 239000000945 filler Substances 0.000 description 7
- 229910021645 metal ion Inorganic materials 0.000 description 7
- 150000001451 organic peroxides Chemical class 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- GUUVPOWQJOLRAS-UHFFFAOYSA-N Diphenyl disulfide Chemical class C=1C=CC=CC=1SSC1=CC=CC=C1 GUUVPOWQJOLRAS-UHFFFAOYSA-N 0.000 description 6
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 6
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000005077 polysulfide Substances 0.000 description 6
- 229920001021 polysulfide Polymers 0.000 description 6
- 150000008117 polysulfides Polymers 0.000 description 6
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 6
- 239000011787 zinc oxide Substances 0.000 description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 5
- 239000000806 elastomer Substances 0.000 description 5
- 125000004464 hydroxyphenyl group Chemical group 0.000 description 5
- 229920002857 polybutadiene Polymers 0.000 description 5
- 239000002356 single layer Substances 0.000 description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 4
- RFCQDOVPMUSZMN-UHFFFAOYSA-N 2-Naphthalenethiol Chemical compound C1=CC=CC2=CC(S)=CC=C21 RFCQDOVPMUSZMN-UHFFFAOYSA-N 0.000 description 4
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 4
- 150000001336 alkenes Chemical class 0.000 description 4
- 230000003712 anti-aging effect Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- 239000004611 light stabiliser Substances 0.000 description 4
- SEXOVMIIVBKGGM-UHFFFAOYSA-N naphthalene-1-thiol Chemical class C1=CC=C2C(S)=CC=CC2=C1 SEXOVMIIVBKGGM-UHFFFAOYSA-N 0.000 description 4
- 239000000049 pigment Substances 0.000 description 4
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 4
- 229960002447 thiram Drugs 0.000 description 4
- 229920002554 vinyl polymer Polymers 0.000 description 4
- 150000003751 zinc Chemical class 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000001530 fumaric acid Substances 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 3
- 239000011976 maleic acid Substances 0.000 description 3
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- 239000012463 white pigment Substances 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- LGXISKQYIKXYTC-UHFFFAOYSA-N 1,2,3,4,5-pentabromo-6-[(2,3,4,5,6-pentabromophenyl)disulfanyl]benzene Chemical compound BrC1=C(Br)C(Br)=C(Br)C(Br)=C1SSC1=C(Br)C(Br)=C(Br)C(Br)=C1Br LGXISKQYIKXYTC-UHFFFAOYSA-N 0.000 description 2
- ULKSDPXEXXZFQY-UHFFFAOYSA-N 1,3-dibromo-2-[(2,6-dibromophenyl)disulfanyl]benzene Chemical compound BrC1=CC=CC(Br)=C1SSC1=C(Br)C=CC=C1Br ULKSDPXEXXZFQY-UHFFFAOYSA-N 0.000 description 2
- LSMZVCLPPFOFNM-UHFFFAOYSA-N 1,3-dichloro-2-[(2,6-dichlorophenyl)disulfanyl]benzene Chemical compound ClC1=CC=CC(Cl)=C1SSC1=C(Cl)C=CC=C1Cl LSMZVCLPPFOFNM-UHFFFAOYSA-N 0.000 description 2
- LLMLGZUZTFMXSA-UHFFFAOYSA-N 2,3,4,5,6-pentachlorobenzenethiol Chemical group SC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl LLMLGZUZTFMXSA-UHFFFAOYSA-N 0.000 description 2
- JARIALSGFXECCH-UHFFFAOYSA-N 2,4,5-trichlorobenzenethiol Chemical group SC1=CC(Cl)=C(Cl)C=C1Cl JARIALSGFXECCH-UHFFFAOYSA-N 0.000 description 2
- FGBVJFREPSJSNG-UHFFFAOYSA-N 2,4-dichlorobenzenethiol Chemical class SC1=CC=C(Cl)C=C1Cl FGBVJFREPSJSNG-UHFFFAOYSA-N 0.000 description 2
- ZHJYYYKHRSMJJP-UHFFFAOYSA-N 2,6-dibromobenzenethiol Chemical compound SC1=C(Br)C=CC=C1Br ZHJYYYKHRSMJJP-UHFFFAOYSA-N 0.000 description 2
- JBISHCXLCGVPGW-UHFFFAOYSA-N 2,6-dichlorobenzenethiol Chemical group SC1=C(Cl)C=CC=C1Cl JBISHCXLCGVPGW-UHFFFAOYSA-N 0.000 description 2
- PALORHWWZVBSLZ-UHFFFAOYSA-N 2,6-difluorobenzenethiol Chemical compound FC1=CC=CC(F)=C1S PALORHWWZVBSLZ-UHFFFAOYSA-N 0.000 description 2
- GRBTZPXUKHVFBN-UHFFFAOYSA-N 2,6-diiodobenzenethiol Chemical class SC1=C(I)C=CC=C1I GRBTZPXUKHVFBN-UHFFFAOYSA-N 0.000 description 2
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical group C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 2
- WEVQKZCDRQCPNR-UHFFFAOYSA-N 2-[(2,6-difluorophenyl)disulfanyl]-1,3-difluorobenzene Chemical class FC1=CC=CC(F)=C1SSC1=C(F)C=CC=C1F WEVQKZCDRQCPNR-UHFFFAOYSA-N 0.000 description 2
- SYBQDIZDGZAUBF-UHFFFAOYSA-N 2-[(2,6-diiodophenyl)disulfanyl]-1,3-diiodobenzene Chemical compound IC1=CC=CC(I)=C1SSC1=C(I)C=CC=C1I SYBQDIZDGZAUBF-UHFFFAOYSA-N 0.000 description 2
- GJYCVCVHRSWLNY-UHFFFAOYSA-N 2-butylphenol Chemical compound CCCCC1=CC=CC=C1O GJYCVCVHRSWLNY-UHFFFAOYSA-N 0.000 description 2
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- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Abstract
Description
0.04≦HF/B≦0.35・・・・(1)
(式(1)中、
HF=(d)ヒンダードフェノール系化合物1分子が有するOH基の官能基数×
(a)基材ゴム100質量部に対する(d)ヒンダードフェノール系化合物の配合量(モル数)、
B=(a)基材ゴム100質量部に対する(b)共架橋剤の配合量(モル数)である。)
0.04≦HF/B≦0.35・・・・(1)
(式(1)中、
HF=(d)ヒンダードフェノール系化合物1分子が有するOH基の官能基数×
(a)基材ゴム100質量部に対する(d)ヒンダードフェノール系化合物の配合量(モル数)、
B=(a)基材ゴム100質量部に対する(b)前記共架橋剤の配合量(モル数)である。)
0.005≦HF≦0.09・・・(2)
(式(2)中、 HF=(d)ヒンダードフェノール系化合物1分子が有するOH基の官能基数×(a)基材ゴム100質量部に対する(d)ヒンダードフェノール系化合物の配合量(モル数))
前記HFは、0.005以上であることがより好ましく、0.007以上であることがさらに好ましく、0.09以下であることがより好ましく、0.085以下であることがさらに好ましい。HFの値が、前記範囲内であれば、耐久性がより良好となるからである。
前記(a)基材ゴムとしては、天然ゴムおよび/または合成ゴムを使用することができ、例えば、ポリブタジエンゴム、天然ゴム、ポリイソプレンゴム、スチレンポリブタジエンゴム、エチレン−プロピレン−ジエンゴム(EPDM)などを使用できる。これらは単独で用いても良いし、2種以上を併用してもよい。これらの中でも、特に、反発に有利なシス−1,4−結合を、40質量%以上、好ましくは80質量%以上、より好ましくは90質量%以上、さらに好ましくは95質量%以上有するハイシスポリブタジエンが好適である。
前記コア用ゴム組成物に使用される(b)炭素数が3〜8のα,β−不飽和カルボン酸および/またはその金属塩は、共架橋剤としてゴム組成物に配合されるものであり、基材ゴム分子鎖にグラフト重合することによって、ゴム分子を架橋する作用を有する。
前記コア用ゴム組成物に使用される(c)架橋開始剤は、(a)基材ゴム成分を架橋するために配合されるものである。(c)架橋開始剤としては、有機過酸化物が好適である。前記有機過酸化物は、具体的には、ジクミルパーオキサイド、1,1−ビス(t−ブチルパーオキシ)−3,3,5−トリメチルシクロヘキサン、2,5−ジメチル−2,5−ジ(t―ブチルパーオキシ)ヘキサン、ジ−t−ブチルパーオキサイドなどの有機過酸化物が挙げられる。これらの有機過酸化物は、単独で使用してもよいし、2種以上を併用してもよい。これらの中でもジクミルパーオキサイドが好ましく用いられる。
ヒンダードフェノール系化合物は、ヒドロキシ基が、嵩高い官能基によって立体的に保護されたヒドロキシフェニル構造を有する化合物である。嵩高い官能基は、ヒドロキシ基に隣接する位置に存在することが好ましい。嵩高い官能基としては、例えば、t−ブチル基、炭素数の一部が硫黄で置換されていてもよい長鎖アルキル基などが挙げられる。ヒンダードフェノール系化合物としては、tert−ブチル基を少なくとも一つ有するtert−ブチルヒドロキシフェニル構造を有する化合物が好ましく、tert−ブチル基を二つ有するジ−tert−ブチルヒドロキシフェニル構造を有する化合物がより好ましい。
前記コア用ゴム組成物は、さらに(e)有機硫黄化合物を含有することが好ましい。(e)有機硫黄化合物を含有することにより、得られるコアの反発性が向上する。
前記コア用ゴム組成物は、共架橋剤として炭素数が3〜8個のα,β−不飽和カルボン酸のみを含有する場合、さらに(f)金属化合物を含有することが好ましい。コア用ゴム組成物中で炭素数が3〜8個のα,β−不飽和カルボン酸を金属化合物で中和することにより、共架橋剤として炭素数が3〜8個のα,β−不飽和カルボン酸の金属塩を使用する場合と実質的に同様の効果が得られるからである。なお、共架橋剤として、炭素数が3〜8個のα,β−不飽和カルボン酸とその金属塩とを併用する場合においては、任意成分として、(f)金属化合物を用いてもよい。
本発明のゴルフボールが有するコアは、前述のコア用ゴム組成物を混合、混練し、金型内で成形することにより得ることができる。この際の条件は、特に限定されないが、通常は130℃〜200℃、圧力2.9MPa〜11.8MPaで10分間〜60分間で行われる。例えば、前記コア用ゴム組成物を130℃〜200℃で10分間〜60分間加熱するか、あるいは、130℃〜150℃で20分間〜40分間加熱した後、160℃〜180℃で5分間〜15分間の2段階で加熱することが好ましい。
本発明のゴルフボールのカバーは、樹脂成分を含有するカバー用組成物から形成される。前記樹脂成分としては、例えば、アイオノマー樹脂、BASFジャパン(株)から商品名「エラストラン(登録商標)」で市販されている熱可塑性ポリウレタンエラストマー、アルケマ(株)から商品名「ペバックス(登録商標)」で市販されている熱可塑性ポリアミドエラストマー、東レ・デュポン(株)から商品名「ハイトレル(登録商標)」で市販されている熱可塑性ポリエステルエラストマー、三菱化学(株)から商品名「ラバロン(登録商標)」で市販されている熱可塑性スチレンエラストマーなどが挙げられる。
本発明のゴルフボールの構造は、コアと、前記コアを被覆する一層以上のカバーとを有するものであれば、特に限定されない。図1は、本発明の一実施形態に係るゴルフボール1が示された一部切り欠き断面図である。ゴルフボール1は、球状コア2と、球状コア2を被覆するカバー3とを有する。このカバーの表面には、多数のディンプル31が形成されている。このゴルフボール1の表面のうち、ディンプル31以外の部分は、ランド32である。このゴルフボール1は、カバー3の外側にペイント層およびマーク層を備えているが、これらの層の図示は省略されている。
(1)圧縮変形量
コアまたはゴルフボールに初期荷重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(圧縮方向にコアまたはゴルフボールが縮む量)を測定した。
H.バーレイス社製自動硬度計デジテストIIを用いて、コアの表面部において測定したショアC硬度をコア表面硬度とした。また、コアを半球状に切断し、切断面の中心の硬度を測定した。
カバー用組成物を用いて、射出成形により、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、自動硬度計(H.バーレイス社製、デジテストII)を用いて硬度を測定した。検出器は、「Shore D」を用いた。
ゴルフラボラトリー社製のスイングロボットM/Cに、メタルヘッド製W#1ドライバー(住友ゴム工業社製、XXIO S ロフト11°)を取り付け、ヘッドスピード45m/秒でゴルフボールを繰り返し打撃し、割れが生じるまでの打撃回数を測定した。なお、測定は各ゴルフボールについて12個ずつ行って、その平均値をそのゴルフボールの打撃回数とした。なお、各ゴルフボールの打撃回数は、ゴルフボールNo.38の打撃回数を100として、指数化した値で評価した。
評価基準:
◎:110以上
〇:100以上110未満
△:90以上100未満
×:90未満
(1)コアの作製
表1〜表6に示す配合のゴム組成物を混練ロールにより混練し、半球状キャビティを有する上下金型内で170℃、30分間加熱プレスすることにより直径39.7mmの球状コアを得た。なお、硫酸バリウムは、得られるゴルフボールの質量が、45.3gとなるように適量加えた。
BR730:JSR社製ハイシスポリブタジエンゴム(シス−1,4−結合含有量=95質量%、1,2−ビニル結合含有量=1.3質量%、ムーニー粘度(ML1+4(100℃))=55、分子量分布(Mw/Mn)=3)
ZDA:日触テクノファインケミカル社製アクリル酸亜鉛ZN−DA90S(ステアリン酸亜鉛10%含有)
ジクミルパーオキサイド:東京化成工業社製
酸化亜鉛:東邦亜鉛社製、「銀嶺R」
硫酸バリウム:堺化学社製、「硫酸バリウムBD」
BHT:東京材料社製ジブチルヒドロキシトルエン
AO−20:株式会社アデカ社製1,3,5−トリス−(3,5−ジ−tert−ブチル−4−ヒドロキシベンジル)−1,3−5−トリアジン−2,4,6(1H,3H,5H−)−トリオン
AO−50:株式会社アデカ製オクタデシル−3−(3’,5’−ジ−t−ブチル−4’−ヒドロキシフェニル)プロピオネート
AO−60:株式会社アデカ製ペンタエリスリトールテトラキス[3−(3,5−ジ−tert−ブチル−4−ヒドロキシフェニル)プロピオネート]
4,4’−メチレンビス(2,6−ジ−tert−ブチルフェノール):東京化成社製
プロブコール:東京化成社製2,6−ジ−tert−ブチル−4−({2−[(3,5−ジ−tert−ブチル−4−ヒドロキシフェニル)スルファニル]プロパン−2−イル}スルファニル)フェノール
表7に示した配合のカバー用材料を、二軸混練型押出機により押し出して、ペレット状のカバー用組成物を調製した。カバー用組成物の押出条件は、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。得られたカバー用組成物を厚さ1.5mmとなるように上述のようにして得られた球状コア上に射出成形して、球状コアと前記コアを被覆するカバーを有するゴルフボールを作製した。得られたゴルフボールについて評価した結果を、表1〜表6に併せて示した。
ハイミラン1555:三井デュポンポリケミカル社製Na中和アイオノマー
ハイミラン1605:三井デュポンポリケミカル社製Na中和アイオノマー
ハイミランAM7329:三井デュポンポリケミカル社製Zn中和アイオノマー
A−220:石原産業社製二酸化チタン
JF−90:城北化学社製光安定剤
Claims (4)
- コアと前記コアを被覆する少なくとも一層のカバーとを有するゴルフボールであって、前記コアは、(a)基材ゴム、(b)共架橋剤として炭素数が3〜8のα,β−不飽和カルボン酸および/またはその金属塩、(c)架橋開始剤、および(d)ヒンダードフェノール系化合物を含有するコア用ゴム組成物から形成されたものであり、前記コア用ゴム組成物には、(b)前記共架橋剤と(d)前記ヒンダードフェノール系化合物とが、以下の関係式(1)を満足するように配合されていることを特徴とするゴルフボール。
0.04≦HF/B≦0.35・・・・(1)
(式(1)中、
HF=(d)ヒンダードフェノール系化合物1分子が有するOH基の官能基数×
(a)基材ゴム100質量部に対する(d)ヒンダードフェノール系化合物の配合量(モル数)、
B=(a)基材ゴム100質量部に対する(b)共架橋剤の配合量(モル数)である。) - さらに、以下の関係式(2)を満足する請求項1に記載のゴルフボール。
0.005≦HF≦0.09・・・(2) - (b)前記共架橋剤の配合量(モル数)は、(a)基材ゴム100質量部に対して、0.12モル以上、0.30モル以下である請求項1または2に記載のゴルフボール。
- (d)前記ヒンダードフェノール系化合物は、ジブチルヒドロキシトルエン、オクタデシル−3−(3,5−ジ−tert−ブチル−4−ヒドロキシフェニル)プロピオネート、4,4’−メチレンビス(2,6−ジ−tert−ブチルフェノール)、2,6−ジ−tert−ブチル−4−({2−[(3,5−ジ−tert−ブチル−4−ヒドロキシフェニル)スルファニル]プロパン−2−イル}スルファニル)フェノール、1,3,5−トリス(3,5−ジ−tert−ブチル−4−ヒドロキシベンジル)−1,3,5−トリアジン−2,4,6−(1H,3H,5H)−トリオン、ペンタエリスリトールテトラキス[3−(3,5−ジ−tert−ブチル−4−ヒドロキシフェニル)プロピオネートよりなる群から選択される少なくとも1種の化合物である請求項1〜3のいずれか一項に記載のゴルフボール。
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EP20170222.2A EP3736026B1 (en) | 2019-05-10 | 2020-04-17 | Golf ball |
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JP2004121815A (ja) | 2002-07-29 | 2004-04-22 | Bridgestone Sports Co Ltd | ゴルフボール |
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KR101367275B1 (ko) * | 2013-09-02 | 2014-02-26 | 주식회사 볼빅 | 열화 방지된 핵을 갖고 있는 골프공 |
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