(19)
(11) EP 2 668 977 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.09.2014 Bulletin 2014/36

(43) Date of publication A2:
04.12.2013 Bulletin 2013/49

(21) Application number: 13168981.2

(22) Date of filing: 23.05.2013
(51) International Patent Classification (IPC): 
A63B 37/00(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 01.06.2012 JP 2012126149
01.06.2012 JP 2012126211

(71) Applicant: Dunlop Sports Co., Ltd.
Hyogo 651-0072 (JP)

(72) Inventors:
  • Sajima, Takahiro
    Kobe-shi, Hyogo 651-0072 (JP)
  • Nakamura, Hirotaka
    Kobe-shi, Hyogo 651-0072 (JP)

(74) Representative: Manitz, Finsterwald & Partner GbR 
Martin-Greif-Strasse 1
80336 München
80336 München (DE)

   


(54) Golf ball


(57) A golf ball 2 includes a spherical core 4 and a cover 6 covering the core 4. The cover 6 includes an inner cover 8 and an outer cover 10 positioned outside the inner cover 8. When distances (%) from a central point of the core 4 to nine points and hardnesses at the nine points, which nine points are obtained by dividing a region from the central point to a surface of the core 4 at intervals of 12.5% of a radius of the core 4, are plotted in a graph, R2 of a linear approximation curve obtained by a least-square method is 0.95 or greater. A hardness of an innermost layer of the cover 6 is greater than a surface hardness of the core 4. Preferably, the core is obtained by a rubber composition being crosslinked. The rubber composition includes an acid and/or a salt (d).







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Search report