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    Golf ball
    32.
    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
    33.
    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 club grip and golf club
    34.
    发明授权
    Golf club grip and golf club 有权

    公开(公告)号：US10328320B2

    公开(公告)日：2019-06-25

    申请号：US15855240

    申请日：2017-12-27

    Applicant: Dunlop Sports Co. Ltd. ,  Sumitomo Rubber Industries, Ltd.

    Inventor： Sho Goji ,  Kazuyoshi Shiga

    IPC: A63B53/14

    Abstract: An object of the present invention is to provide a golf club grip comprising a grip end with improved abrasion resistance and a reduced weight. The present invention provides a golf club grip comprising a cylindrical grip body and a grip end attached to a bat-side end of the cylindrical grip body, wherein the grip end comprises a base polymer and a hollow glass filler.

    Rubber composition, crosslinked rubber molded product and golf ball
    35.
    发明授权
    Rubber composition, crosslinked rubber molded product and golf ball 有权

    公开(公告)号：US10322317B2

    公开(公告)日：2019-06-18

    申请号：US15851107

    申请日：2017-12-21

    Applicant: Dunlop Sports Co. Ltd. ,  Sumitomo Rubber Industries, Ltd.

    Inventor： Hiroshi Tadaoka ,  Kazuyoshi Shiga

    IPC: C08L9/00 ,  C08J3/24 ,  A63B37/02 ,  C08K5/098 ,  A63B37/00 ,  C08K3/22 ,  C08L21/00

    Abstract: An object of the present invention is to provide a rubber composition from which a crosslinked rubber molded product excellent in the resilience performance can be obtained. The present invention provides a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent and (c) a crosslinking initiator, wherein (b) the co-crosslinking agent contains a complex represented by a general formula (1). ((RCOO)8M5(OH)2)n  (1) [In the formula (1), M is a metal atom, R is a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms or an alkynyl group having 2 to 18 carbon atoms, and n is an integer of 1 or more. A plurality of R and M may be identical to or different from each other. At least one of R is the alkenyl group having 2 to 18 carbon atoms or the alkynyl group having 2 to 18 carbon atoms.]

    Golf club grip and golf club
    36.
    发明授权
    Golf club grip and golf club 有权

    公开(公告)号：US10279234B2

    公开(公告)日：2019-05-07

    申请号：US15674687

    申请日：2017-08-11

    Applicant: Dunlop Sports Co. Ltd. ,  Sumitomo Rubber Industries, Ltd.

    Inventor： Sho Goji ,  Kazuyoshi Shiga

    IPC: A63B60/08 ,  A63B53/14 ,  C08K3/36 ,  C08K5/548 ,  C08K7/18 ,  C08K7/26 ,  C08L7/00 ,  C08L15/00 ,  A63B102/32

    Abstract: An object of the present invention is to provide a golf club grip having excellent grip performance under a wet condition. The present invention provides a golf club grip having an outermost surface layer, wherein the outermost surface layer contains (A) a crosslinked rubber and (B) a silica, and has, at at least a part thereof, a region where a spherical silica secondary particle with a particle size of 3 μm or more exists in an amount of at least two particles/mm2. If a spherical silica secondary particle with a particle size of 3 μm or more exists in a given amount at at least a part of the outermost surface layer, the golf club grip has an improved grip performance under a wet condition.

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