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    Golf ball
    1.
    发明授权
    Golf ball 有权

    公开(公告)号：US11376476B2

    公开(公告)日：2022-07-05

    申请号：US15782577

    申请日：2017-10-12

    Applicant: Dunlop Sports Co. Ltd.

    Inventor： Chiemi Mikura ,  Kazuyoshi Shiga ,  Hikaru Nagakura ,  Ryota Sakamine

    IPC: A63B37/04 ,  A63B37/00 ,  C08K5/00 ,  C08K5/098 ,  C08K5/09 ,  C08K5/14

    Abstract: An object of the present invention is to provide a golf ball having an excellent flight performance on driver shots. The present invention provides a golf ball comprising a spherical core and at least one cover covering the spherical core, wherein a hardness difference D1 (H75−H0) between a hardness H75 at a point radially located at a distance of 75% from a center of the spherical core and a center hardness H0 of the spherical core is 10 or more and 27 or less in Shore C hardness, and a hardness difference D2 (Hs−H75) between a surface hardness Hs of the spherical core and the hardness H75 at the point radially located at the distance of 75% from the center of the spherical core is 0 or more and 6.5 or less in Shore C hardness.

    Golf ball
    2.
    发明授权
    Golf ball 有权

    公开(公告)号：US10894191B2

    公开(公告)日：2021-01-19

    申请号：US15795732

    申请日：2017-10-27

    Applicant: Dunlop Sports Co. Ltd.

    Inventor： Ryota Sakamine ,  Kazuyoshi Shiga ,  Hikaru Nagakura ,  Takahiro Shigemitsu

    IPC: A63B37/12 ,  C08L23/08 ,  A63B37/00 ,  C08K9/04 ,  G01B5/00 ,  C08K5/00 ,  C08K5/098

    Abstract: An object of the present invention is to provide a golf ball traveling a great flight distance. The present invention provides a golf ball comprising a spherical core and a cover covering the spherical core, wherein the golf ball has a ratio (t2/t1) of a time (t2) to a time (t1) of 1.05 or more in a hitting test using a driver (at a head speed of 40 m/sec), wherein the time (t1) is a time taken from a moment that the driver begins to contact with the golf ball to a moment that the golf ball reaches a maximum deformation amount, and the time (t2) is a time taken from the moment that the golf ball reaches the maximum deformation amount to a moment that the golf ball leaves the driver.

    Golf ball
    3.
    发明授权
    Golf ball 有权

    公开(公告)号：US10213655B2

    公开(公告)日：2019-02-26

    申请号：US15223778

    申请日：2016-07-29

    Applicant: Dunlop Sports Co. Ltd.

    Inventor： Hikaru Nagakura ,  Kazuyoshi Shiga ,  Ryota Sakamine ,  Takahiro Shigemitsu

    IPC: A63B37/02 ,  A63B37/04 ,  A63B37/06 ,  A63B37/00 ,  C08K5/098

    Abstract: An object of the present invention is to provide a golf ball having an excellent initial velocity when being hit at a head speed of 50 m/sec and an improved initial velocity when being hit at a head speed of 40 m/sec. The present invention provides a golf ball comprising a spherical core and a cover covering the spherical core, wherein the golf ball has a rebound equivalence energy ratio (R40) ranging from 65.50% to 99.0% at a deformation amount of 7%, and a rebound equivalence energy ratio (R50) ranging from 20.0% to 70.0% at a deformation amount of 19%, in a compression test (measurement temperature: −70° C., compression speed: 30 mm/min) applying a load to the golf ball along a radial direction of the golf ball.

    Golf ball
    5.
    发明授权
    Golf ball 有权

    公开(公告)号：US10590259B2

    公开(公告)日：2020-03-17

    申请号：US15716972

    申请日：2017-09-27

    Applicant: DUNLOP SPORTS CO. LTD.

    Inventor： Chiemi Mikura ,  Kazuyoshi Shiga ,  Hikaru Nagakura ,  Ryota Sakamine

    IPC: A63B37/02 ,  C08K5/098 ,  A63B37/00 ,  C08K3/22 ,  C08K5/14 ,  C08K5/375 ,  C08K3/30 ,  C08K5/40

    Abstract: A golf ball includes a spherical core, and a cover covering the spherical core. The spherical core is formed from a rubber composition including a base rubber, a co-cross-linking agent, a cross-linking initiator, and an unsaturated fatty acid and/or a metal salt thereof, the co-cross-linking agent includes α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof, the unsaturated fatty acid and/or metal salt thereof excludes an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and a metal salt thereof, an unsaturated aliphatic carboxylic acid that forms the unsaturated fatty acid and/or metal salt thereof has a functional group other than a carboxy group and a carbon-carbon unsaturated bond, and the rubber composition further includes a metal compound when the co-cross-linking agent is only an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms.

    Golf ball
    6.
    发明授权
    Golf ball 有权

    公开(公告)号：US10188910B2

    公开(公告)日：2019-01-29

    申请号：US15782069

    申请日：2017-10-12

    Applicant: Dunlop Sports Co. Ltd.

    Inventor： Chiemi Mikura ,  Kazuyoshi Shiga ,  Hikaru Nagakura ,  Ryota Sakamine

    IPC: A63B37/06 ,  A63B37/00 ,  C08K5/09

    Abstract: An object of the present invention is to provide a golf ball having an excellent flight performance on driver shots. The present invention provides a golf ball comprising a spherical core and at least one cover covering the spherical core, wherein a hardness difference D1 (H75−H0) between a hardness H75 at a point located at a distance of 75% of a core radius from a center of the spherical core and a center hardness H0 of the spherical core is 15 or more and 35 or less in Shore C hardness, a hardness difference D2 (Hs−H75) between a surface hardness Hs of the spherical core and the hardness H75 at the point located at the distance of 75% of the core radius from the center of the spherical core is −1 or more and 3.5 or less in Shore C hardness, and a hardness difference D3 ((H0+H75)/2−H37.5) between a hardness of (the center hardness H0 of the spherical core+the hardness H75 at the point located at the distance of 75% of the core radius from the center of the spherical core)/2 and a hardness H37.5 at a point located at a distance of 37.5% of the core radius from the center of the spherical core is 0.5 or more and 6.5 or less in Shore C hardness.

    Golf ball
    7.
    发明授权
    Golf ball 有权

    公开(公告)号：US10143894B2

    公开(公告)日：2018-12-04

    申请号：US15620000

    申请日：2017-06-12

    Applicant: Dunlop Sports Co. Ltd.

    Inventor： Hikaru Nagakura ,  Kazuyoshi Shiga ,  Chiemi Mikura ,  Takahiro Shigemitsu

    IPC: A63B37/04 ,  A63B37/06 ,  A63B37/00 ,  C08L21/00

    Abstract: An object of the present invention is to provide a golf ball having excellent flying performance on driver shots. The present invention provides a golf ball having a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing: (a) a base rubber, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, (d) an unsaturated fatty acid and/or a metal salt thereof (excluding an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof), and (e) a saturated fatty acid and/or a metal salt thereof, provided that the rubber composition further contains (f) a metal compound in the case of containing only (b) the α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent.

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