公开(公告)号：US09975005B2

公开(公告)日：2018-05-22

申请号：US15381966

申请日：2016-12-16

Applicant: Dunlop Sports Co. Ltd.

Inventor： Kosuke Tachibana ,  Kazuya Kamino ,  Toshiyuki Tarao ,  Hidetaka Inoue

IPC: A63B37/00 ,  C09D175/04 ,  C09D175/00

CPC classification number: A63B37/0022 ,  A63B37/0029 ,  A63B37/0031 ,  A63B37/0033 ,  A63B37/0043 ,  A63B37/0045 ,  A63B37/0062 ,  A63B37/0063 ,  A63B37/0075 ,  A63B37/0076 ,  A63B37/0092 ,  C09D175/00 ,  C09D175/04

Abstract: An object of the present invention is to provide a golf ball travelling a great flight distance on driver shots, exhibiting an excellent spin performance on approach shots under a dry condition and a wet condition, and showing an excellent shot feeling and durability. The present invention provides a golf ball comprising a golf ball body having a spherical core, an intermediate layer and a cover, and a paint film composed of two or more layers, wherein a 10% elastic modulus difference (Min−Mout) between an innermost layer and an outermost layer of the paint film is 25 kgf/cm2 or more.

公开(公告)号：US09956456B2

公开(公告)日：2018-05-01

申请号：US15138484

申请日：2016-04-26

Applicant: DUNLOP SPORTS CO. LTD.

Inventor： Kazuya Kamino ,  Kosuke Tachibana

IPC: A63B37/02 ,  A63B37/00

CPC classification number: A63B37/0092 ,  A63B37/0031 ,  A63B37/0033 ,  A63B37/0037 ,  A63B37/0039 ,  A63B37/004 ,  A63B37/0043 ,  A63B37/0044 ,  A63B37/0045 ,  A63B37/0049 ,  A63B37/006 ,  A63B37/0062 ,  A63B37/0063 ,  A63B37/0064 ,  A63B37/0076

Abstract: Provided is a golf ball comprising a spherical core including an inner layer and an outer layer, an intermediate layer and a cover, wherein a difference (HX+1−HX−1) is 0 or more in Shore C hardness, a surface hardness (HX+Y) of the spherical core is more than 70 in Shore C hardness, an angle α of a hardness gradient of the inner layer is 0° or more, a difference (α−β) between the angle α and an angle β of a hardness gradient of the outer layer is 0° or more, the intermediate layer has a material hardness (Hm) ranging from 65 to 80 in Shore D hardness, and the intermediate layer has a highest hardness among the constituent members of the golf ball.

公开(公告)号：US09468813B2

公开(公告)日：2016-10-18

申请号：US14752427

申请日：2015-06-26

Applicant: DUNLOP SPORTS CO. LTD.

Inventor： Kosuke Tachibana ,  Kazuya Kamino ,  Takahiro Sajima

IPC: A63B37/06 ,  A63B37/00

CPC classification number: A63B37/0075 ,  A63B37/0006 ,  A63B37/0012 ,  A63B37/0021 ,  A63B37/0033 ,  A63B37/0043 ,  A63B37/0092

Abstract: A golf ball 2 includes a core 4, a mid layer 6, a cover 8 and a paint layer 10. The core 4 includes a center 12 and an envelope layer 14. The golf ball 2 satisfies the following mathematical formulas. In the mathematical formulas, Hm represents a Shore D hardness of the mid layer, Hc represents a Shore D hardness of the cover, and Hb represents a Shore D hardness of the surface of the golf ball. The golf ball 2 has a large number of dimples 16 on a surface thereof. The number of planes that can divide a pattern of the dimples so that divided patterns are mirror symmetry to each other is one. Hc≦49 Hm−Hc≧15 Hm−Hb≦2

公开(公告)号：US10279222B2

公开(公告)日：2019-05-07

申请号：US14981418

申请日：2015-12-28

Applicant: Dunlop Sports Co., Ltd.

Inventor： Kazuya Kamino ,  Kosuke Tachibana

IPC: A63B37/06 ,  A63B37/00

Abstract: An object of the present invention is to provide a golf ball traveling a great flight distance on driver shots and an excellent shot feeling. The present invention provides a golf ball comprising a spherical core, an intermediate layer covering the spherical core, and a cover covering the intermediate layer, wherein a material hardness (Hm) of a resin composition constituting the intermediate layer ranges from 65 to 80 in Shore D hardness, a material hardness (Hc) of a resin composition constituting the cover ranges from 57 to 72 in Shore D hardness, a hardness difference (Hm−Hc) between the material hardness (Hm) and the material hardness (Hc) is more than 0, and the intermediate layer has a surface hardness satisfying a hardness difference (HmsC−HmsD) between a hardness thereof shown in Shore C hardness (HmsC) and a hardness thereof shown in Shore D hardness (HmsD) of 27 or less.

公开(公告)号：US09861861B2

公开(公告)日：2018-01-09

申请号：US14752421

申请日：2015-06-26

Applicant: DUNLOP SPORTS CO. LTD.

Inventor： Kazuya Kamino ,  Kosuke Tachibana ,  Takahiro Sajima

IPC: A63B37/06 ,  A63B37/00

CPC classification number: A63B37/0086 ,  A63B37/0006 ,  A63B37/0012 ,  A63B37/0013 ,  A63B37/0021 ,  A63B37/0022 ,  A63B37/0029 ,  A63B37/0033 ,  A63B37/0037 ,  A63B37/004 ,  A63B37/0045 ,  A63B37/0049 ,  A63B37/0075 ,  A63B37/0076 ,  A63B37/0077

Abstract: A golf ball 2 includes a core 4, a mid layer 6, a cover 8 and a paint layer 10. The core 4 includes a center 12 and an envelope layer 14. The golf ball 2 satisfies the following mathematical formulas. In the mathematical formulas, Tm represents a thickness of the mid layer, Tcmin represents a minimum thickness of the cover, Tcmax represents a maximum thickness of the cover, and Tp represents a thickness of the paint layer. The golf ball 2 has a large number of dimples 16 on a surface thereof. The number of planes that can divide a pattern of the dimples so that divided patterns are mirror symmetry to each other is one. Tm>Tcmax≧Tcmin>Tp (Tcmax−Tcmin)≦0.15 mm 0.15≧(Tp/Tcmin)≧0.04

公开(公告)号：US09789369B2

公开(公告)日：2017-10-17

申请号：US15139113

申请日：2016-04-26

Applicant: Dunlop Sports Co. Ltd.

Inventor： Hironori Takihara ,  Kosuke Tachibana ,  Takahiro Sajima ,  Kohei Mimura

IPC: A63B37/04 ,  A63B37/00

CPC classification number: A63B37/0092 ,  A63B37/0031 ,  A63B37/0032 ,  A63B37/0033 ,  A63B37/0039 ,  A63B37/0043 ,  A63B37/0044 ,  A63B37/0045 ,  A63B37/0062 ,  A63B37/0063 ,  A63B37/0064 ,  A63B37/0075 ,  A63B37/0076

Abstract: An object of the present invention is to provide a golf ball traveling a great distance on driver shots and on iron shots. The present invention provides a golf ball comprising a spherical core including an inner layer and an outer layer, and a cover, wherein a difference (HX+1−HX−1) between a hardness (HX+1) at a point outwardly away in a radial direction from a boundary between the inner layer and the outer layer of the spherical core by 1 mm and a hardness (HX−1) at a point inwardly away in the radial direction from the boundary between the inner layer and the outer layer of the spherical core by 1 mm is 0 or more in Shore C hardness, a surface hardness (HX+Y) of the spherical core is more than 65 in Shore C hardness, an angle α of a hardness gradient of the inner layer is 0° or more, a difference (α−β) between the angle α and an angle β of a hardness gradient of the outer layer is 0° or more, a thickness of the cover is 3 mm or less, a difference (Hc−Hx+y) between a hardness (Hc) of the cover and the surface hardness (HX+Y) of the spherical core is 2 or more in Shore C hardness, and the cover has a highest hardness among the constituent members of the golf ball.

公开(公告)号：US09682284B2

公开(公告)日：2017-06-20

申请号：US14578647

申请日：2014-12-22

Applicant: DUNLOP SPORTS CO. LTD.

Inventor： Kazuhiko Isogawa ,  Kosuke Tachibana

IPC: A63B37/00

CPC classification number: A63B37/0077 ,  A63B37/0031 ,  A63B37/0033 ,  A63B37/0039 ,  A63B37/004 ,  A63B37/0043 ,  A63B37/0044 ,  A63B37/0045 ,  A63B37/0076 ,  A63B37/008 ,  A63B37/0092

Abstract: A golf ball 2 includes a core 4, a first mid layer 10, a second mid layer 12, a third mid layer 14, and a cover 8. A volume Vinm and a Shore D hardness Hinm of the first mid layer, a volume Vm and a Shore D hardness Hm of the second mid layer, a volume Voum and a Shore D hardness Houm of the third mid layer, a volume Vc and a Shore D hardness Hc of the cover, and a volume V of an entirety of the ball meet: (a) Hinm Houm>Hc, (b) Vinm Voum>Vc, (c) Hm−Hc>25, (d) (Vinm+Vm+Voum+Vc)/V 1.50, and (f) (Vm*Hm)/(Vc*Hc)>3.0.

公开(公告)号：US10350458B2

公开(公告)日：2019-07-16

申请号：US14981004

申请日：2015-12-28

Applicant: DUNLOP SPORTS CO. LTD.

Inventor： Kosuke Tachibana ,  Kazuya Kamino

IPC: A63B37/00

Abstract: An object of the present invention is to provide a golf ball traveling a great distance on driver shots. The present invention provides a golf ball comprising a spherical core including an inner layer and an outer layer, wherein a difference (HX+1−HX−1) between a hardness (HX+1) at a point outwardly away in a radial direction from a boundary between the inner layer and the outer layer of the spherical core by 1 mm and a hardness (HX−1) at a point inwardly away in the radial direction from the boundary between the inner layer and the outer layer of the spherical core by 1 mm is 0 or more in Shore C hardness, a surface hardness (HX+Y) of the spherical core is more than 70 in Shore C hardness, an angle α of a hardness gradient of the inner layer is 0° or more, and a difference (α−β) between the angle α and an angle β of a hardness gradient of the outer layer is 0° or more.

公开(公告)号：US10286258B2

公开(公告)日：2019-05-14

申请号：US13872487

申请日：2013-04-29

Applicant: DUNLOP SPORTS CO. LTD.

Inventor： Kazuhiko Isogawa ,  Kosuke Tachibana

IPC: A63B37/00 ,  A63B37/02 ,  C08K5/00 ,  C08K5/09 ,  C08K5/098 ,  A63B37/06

Abstract: A golf ball 2 includes a core 4, a first mid layer 6, a second mid layer 8, and a cover 12. The core 4 includes a center 18 and an envelope layer 20. The center 18 is formed by crosslinking a first rubber composition, and the envelope layer 20 is formed by crosslinking a second rubber composition. The first rubber composition or the second rubber composition includes a base rubber, a co-crosslinking agent, a crosslinking initiator, and an acid and/or a salt. The co-crosslinking agent is: (1) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms; and/or (2) a metal salt of an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms. A hardness Hm2 of the second mid layer 8 is greater than a hardness Hm1 of the first mid layer 6. The hardness Hm2 is greater than a hardness Hc of the cover 12.

公开(公告)号：US10272296B2

公开(公告)日：2019-04-30

申请号：US13667985

申请日：2012-11-02

Applicant: DUNLOP SPORTS CO. LTD.

Inventor： Kazuhiko Isogawa ,  Kosuke Tachibana

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

Abstract: A golf ball 2 includes a core 4, amid layer 6, a reinforcing layer 8, and a cover 10. The core 4 includes a center 12 and an envelope layer 14. The envelope layer 14 is formed by a rubber composition being crosslinked. The rubber composition includes a base rubber (a), a co-crosslinking agent (b), a crosslinking initiator (c), and an acid and/or a salt (d). The co-crosslinking agent (b) is: (b1) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms; or (b2) a metal salt of an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms.