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公开(公告)号：US10183197B2
公开(公告)日：2019-01-22
申请号：US15699748
申请日：2017-09-08
Applicant: Dunlop Sports Co., Ltd.
Inventor： Toshiyuki Tarao , Mami Tanaka
Abstract: An object of the present invention is to provide a golf ball excellent in durability. The present invention provides a golf ball comprising a constituent member containing a crosslinked rubber component and a polyrotaxane component, wherein the polyrotaxane has a cyclodextrin, a linear molecule piercing through the cyclic structure of the cyclodextrin, and blocking groups located at both terminals of the linear molecule to prevent disassociation of the cyclodextrin, and at least a part of hydroxyl groups of the cyclodextrin is modified with a caprolactone chain via —O—C3H6—O— group.
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公开(公告)号：US20180178075A1
公开(公告)日：2018-06-28
申请号：US15854039
申请日：2017-12-26
Applicant: DUNLOP SPORTS CO. LTD.
Inventor： Toshiyuki TARAO , Kazuya Kamino , Mami Tanaka , Hidetaka Inoue
IPC: A63B37/00
CPC classification number: A63B37/0022 , A63B37/0043 , A63B37/0044 , A63B37/0062 , A63B37/0063 , A63B37/0073 , A63B37/0074 , A63B37/0075 , A63B37/0076 , A63B37/0092 , A63B37/0096
Abstract: An object of the present invention is to provide a golf ball having good spin performance on approach shots and good shot feeling as well as excellent stain resistance by precisely controlling physical properties of a paint film actually formed on a surface of a golf ball body. The present invention provides a golf ball comprising a golf ball body and a paint film formed on a surface of the golf ball body, wherein the paint film is such that a linear approximation curve obtained by a least square method has a slope in a range from 0.0015 to 0.0045 when a storage modulus (GPa) thereof measured by a nanoindentation method is plotted as a vertical axis against a measuring frequency (Hz) as a horizontal axis, and that an elastic modulus thereof measured by a nanoindentation method ranges from 0.040 GPa to 0.600 GPa.
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公开(公告)号：US10160858B2
公开(公告)日：2018-12-25
申请号：US15337825
申请日：2016-10-28
Applicant: Dunlop Sports Co. Ltd.
Inventor： Mami Tanaka , Toshiyuki Tarao
Abstract: An object of the present invention is to provide a golf ball having an excellent spin performance on approach shots under a wet condition. The present invention provides a golf ball comprising a spherical core and a cover covering the spherical core, wherein the cover is formed from a cover composition containing (A) a polyurethane and (B) a polyrotaxane as a resin component, and wherein (B) the polyrotaxane has a cyclodextrin, a linear molecule piercing through the cyclic structure of the cyclodextrin, and blocking groups located at both terminals of the linear molecule to prevent disassociation of the cyclodextrin, and at least a part of hydroxyl groups of the cyclodextrin is modified with a caprolactone chain via —O—C3H6—O— group.
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公开(公告)号：US09931542B2
公开(公告)日：2018-04-03
申请号：US15645144
申请日：2017-07-10
Applicant: DUNLOP SPORTS CO. LTD.
Inventor： Hidetaka Inoue , Kazuya Kamino , Kohei Mimura , Toshiyuki Tarao , Mami Tanaka
CPC classification number: A63B37/0012 , A63B37/0003 , A63B37/0006 , A63B37/0017 , A63B37/0018 , A63B37/0019 , A63B37/002 , A63B37/0021 , A63B37/0022 , A63B37/0038
Abstract: A golf ball 2 includes a main body 4 and a paint film 6. The paint film 6 includes an inner layer 14 and an outer layer 16. A modulus Min of the inner layer 14 is higher than a modulus Mout of the outer layer 16. A difference (Min−Mout) is not less than 25 kgf/cm2. The golf ball 2 has a plurality of dimples 18. A ratio So of a sum of areas of the dimples 18 relative to a surface area of a phantom sphere of the golf ball 2 and a ratio Rs of a number of the dimples 18 each having a diameter of not less than 9.60% and not greater than 10.37% of a diameter of the golf ball 2, relative to a total number of the dimples 18, satisfy the following mathematical formula (1). Rs≥−2.5*So+273 (1)
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公开(公告)号：US10456628B2
公开(公告)日：2019-10-29
申请号：US15842263
申请日：2017-12-14
Applicant: Dunlop Sports Co. Ltd.
Inventor： Toshiyuki Tarao , Kazuya Kamino , Mami Tanaka , Hidetaka Inoue
Abstract: An object of the present invention is to provide a golf ball having good spin performance on approach shots and good shot feeling as well as excellent stain resistance by precisely controlling physical properties of a paint film actually formed on a surface of a golf ball body. The present invention provides a golf ball comprising a golf ball body and a paint film formed on a surface of the golf ball body, wherein the paint film is such that a linear approximation curve obtained by a least square method has a slope in an absolute value ranging from 0.0001 to 0.0020 when a loss tangent tan δ thereof measured by a nanoindentation method is plotted as a vertical axis against a measuring frequency (Hz) as a horizontal axis, and that an elastic modulus thereof measured by a nanoindentation method ranges from 0.040 GPa to 0.600 GPa.
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Patent Agency Ranking
公开(公告)号：US10232226B2
公开(公告)日：2019-03-19
申请号：US15347459
申请日：2016-11-09
Applicant: DUNLOP SPORTS CO. LTD.
Inventor： Kosuke Tachibana , Kazuya Kamino , Toshiyuki Tarao , Mami Tanaka
Abstract: A golf ball 2 includes a core 4, a mid layer 6, and a cover 8. A difference DH in hardness between a surface and a central point of the core 4, a thickness Tm and a hardness Hm of the mid layer 6, a thickness Tc and a hardness Hc of the cover 8, and an amount of compressive deformation Sb of the golf ball 2 meet the following mathematical formulas (DH*Hm)/(Hc*Tc)>80 and ((Sb*Tc)/(Hc*Hm*Tm))*1000>0.75. A hardness Hc of the cover 8 is equal to or less than 40. A material of the cover 8 is a resin composition. The resin composition includes a polyurethane (A) and a polyrotaxane (B).
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公开(公告)号：US10376745B2
公开(公告)日：2019-08-13
申请号：US15854122
申请日：2017-12-26
Applicant: Dunlop Sports Co. Ltd.
Inventor： Mami Tanaka , Toshiyuki Tarao
Abstract: An object of the present invention is to provide a golf ball exhibiting good shot feeling and excellent resilience. The present invention provides a golf ball comprising a spherical core and one or more cover layers disposed outside the spherical core, wherein at least one layer of the cover layers contains: (A) a base resin containing (a-1) an ionomer resin and having a material hardness of 59 or more in Shore D hardness; and (B) a polyrotaxane having a cyclodextrin with at least a part of hydroxyl groups of the cyclodextrin being modified with a caprolactone chain via —O—C3H6—O— group, a linear molecule piercing through a cyclic structure of the cyclodextrin, and blocking groups located at both terminals of the linear molecule to prevent disassociation of the cyclodextrin.
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公开(公告)号：US10293214B2
公开(公告)日：2019-05-21
申请号：US15592861
申请日：2017-05-11
Applicant: Dunlop Sports Co. Ltd.
Inventor： Mami Tanaka , Toshiyuki Tarao
IPC: A63B37/12 , C08G18/48 , A63B37/00 , C08G18/40 , C08G83/00 , C08L75/00 , C08G18/64 , C08G18/66 , C08G18/75 , C08G18/76 , C08G18/32
Abstract: An object of the present invention is to provide a golf ball having excellent abrasion resistance and spin performance on driver shots. The present invention provides a golf ball having a spherical core and a cover covering the spherical core, wherein the cover contains a polyurethane, wherein the polyurethane comprises, as a constituent component, (A) a polyisocyanate component and (B) a polyol component containing (b1) a polyrotaxane, and wherein (b1) the polyrotaxane has a cyclodextrin, a linear molecule piercing through the cyclic structure of the cyclodextrin, and a blocking group located at both terminals of the linear molecule to prevent disassociation of the cyclodextrin, and at least a part of hydroxyl groups of the cyclodextrin is modified with a caprolactone chain via —O—C3H6—O— group.
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公开(公告)号：US10195490B2
公开(公告)日：2019-02-05
申请号：US15343889
申请日：2016-11-04
Applicant: DUNLOP SPORTS CO. LTD.
Inventor： Kazuya Kamino , Kosuke Tachibana , Toshiyuki Tarao , Mami Tanaka
Abstract: A golf ball 2 includes an inner core 4, an outer core 6, a mid layer 8, and a cover 10. A diameter D1, a volume V1, a hardness H1o at a central point, and a boundary inside hardness H1in of the inner core 4; a volume V2, a boundary outside hardness H2out, and a surface hardness H2s of the outer core 6; a thickness Tm and a hardness Hm of the mid layer 8; and a thickness Tc and a hardness Hc of the cover 10 meet the following mathematical formulas (1) to (4): 1.0
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公开(公告)号：US10363459B2
公开(公告)日：2019-07-30
申请号：US15854092
申请日：2017-12-26
Applicant: Dunlop Sports Co. Ltd.
Inventor： Mami Tanaka , Toshiyuki Tarao
Abstract: An object of the present invention is to provide a golf ball having excellent shot feeling and resilience as well as improved durability and abrasion resistance. The present invention provides a golf ball comprising a spherical core and one or more cover layers disposed outside the spherical core, wherein at least one layer of the cover layers contains: (A) a base resin containing (a-1) an ionomer resin and having a material hardness of 58 or less in Shore D hardness; and (B) a polyrotaxane having a cyclodextrin with at least a part of hydroxyl groups thereof being modified with a caprolactone chain via —O—C3H6—O— group, a linear molecule piercing through a cyclic structure of the cyclodextrin, and blocking groups located at both terminals of the linear molecule to prevent disassociation of the cyclodextrin.
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