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公开(公告)号：US11633649B2
公开(公告)日：2023-04-25
申请号：US17871037
申请日：2022-07-22
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Hikaru Nagakura , Kazuyoshi Shiga , Kai Hayashi , Takahiro Shigemitsu
Abstract: An object of the present invention is to provide a golf ball having excellent durability and good shot feeling. The present invention provides a golf ball comprising a core, wherein a difference (crosslinking density at surface of core-crosslinking density at center of core) between a crosslinking density at a surface of the core and a crosslinking density at a center of the core is more than 1.0×102 mol/m3 and less than 9.0×102 mol/m3, and a hardness difference (Hs−Ho) between Hs and Ho is 13.0 or more and 30.0 or less, and the core satisfies H50−Ho>Hs−H50, wherein Hs (Shore C hardness) is a hardness at the surface of the core, Ho (Shore C hardness) is a hardness at the center of the core, and H50 (Shore C hardness) is a hardness at a midpoint between the center of the core and the surface of the core.
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公开(公告)号：US11426635B2
公开(公告)日：2022-08-30
申请号：US17212335
申请日：2021-03-25
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Hikaru Nagakura , Kazuyoshi Shiga , Kai Hayashi , Takahiro Shigemitsu
Abstract: An object of the present invention is to provide a golf ball having excellent durability and good shot feeling. The present invention provides a golf ball comprising a core, wherein a difference (crosslinking density at surface of core−crosslinking density at center of core) between a crosslinking density at a surface of the core and a crosslinking density at a center of the core is more than 1.0×102 mol/m3 and less than 9.0×102 mol/m3, and a hardness difference (Hs−Ho) between Hs and Ho is 13.0 or more and 30.0 or less, and the core satisfies H50−Ho>Hs−H50, wherein Hs (Shore C hardness) is a hardness at the surface of the core, Ho (Shore C hardness) is a hardness at the center of the core, and H50 (Shore C hardness) is a hardness at a midpoint between the center of the core and the surface of the core.
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公开(公告)号：US11370760B2
公开(公告)日：2022-06-28
申请号：US17125007
申请日：2020-12-17
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Takumi Kaneko , Takahiro Shigemitsu , Kazuyoshi Shiga
IPC: C07D231/12
Abstract: An object of the present invention is to provide a dithioester compound generating an aralkyloxy radical having high ability of abstracting hydrogen. The present invention provides a dithioester compound represented by a formula (1). In the formula (1), R1 and R2 each independently represent an alkyl group having 1 or more carbon atoms, an alkenyl group having two or more carbon atoms, an alkynyl group having two or more carbon atoms, an aryl group having 6 or more carbon atoms and optionally having a substituent group, an aralkyl group having 6 or more carbon atoms, a hydrogen atom, or a halogen atom; R3 represents an aryl group having 6 or more carbon atoms and optionally having a substituent group, or an aralkyl group having 6 or more carbon atoms and optionally having a substituent group.
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公开(公告)号：US10960270B2
公开(公告)日：2021-03-30
申请号：US16113828
申请日：2018-08-27
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Takahiro Shigemitsu
Abstract: An object of the present invention is to provide a golf ball resin composition by which durability can be improved without substantially reducing hardness and resilience, and a golf ball using the same. The present invention provides a golf ball resin composition containing (A) at least one member selected from the group consisting of an ionomer resin, a polyamide and a styrene-based elastomer, and (B) an acid modified polyolefin having a weight average molecular weight in a range from 5,000 to 80,000.
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公开(公告)号：US10940368B2
公开(公告)日：2021-03-09
申请号：US16586368
申请日：2019-09-27
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Hikaru Nagakura , Kai Hayashi , Kazuyoshi Shiga , Takahiro Shigemitsu
Abstract: An object of the present invention is to provide a golf ball having excellent shot feeling on driver shots. The present invention provides a golf ball comprising a core and at least one cover covering the core, wherein a material for forming the core has a loss tangent difference Δ tan δ (tan δ−80−tan δ−40) of 0.12 or more between a loss tangent tan δ−80 at −80° C. and a loss tangent tan δ−40 at −40° C.
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Patent Agency Ranking
公开(公告)号：US10703888B2
公开(公告)日：2020-07-07
申请号：US15811075
申请日：2017-11-13
Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
Inventor： Takahiro Shigemitsu , Hidetaka Inoue
Abstract: An object of the present invention is to provide a golf ball resin composition having improved rebound resilience performance. The present invention provides a golf ball resin composition containing: (A) a thermoplastic resin having an infrared absorption peak in a region from 3200 cm−1 to 3600 cm−1, and (B) at least one resin component selected from the group consisting of (b-1) a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, (b-2) a metal ion-neutralized product of a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, (b-3) a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and an α,β-unsaturated carboxylic acid ester, and (b-4) a metal ion-neutralized product of a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and an α,β-unsaturated carboxylic acid ester, wherein when a relaxation modulus Er (−20° C., 9%) of the golf ball resin composition is measured under conditions of −20° C. and a strain of 9%, a relaxation curve is plotted with the relaxation modulus (MPa) as the vertical axis and a logarithm (ln(t)) of time (sec) as the horizontal axis, and the relaxation curve is linearly approximated to obtain a linear approximation curve, the linear approximation curve has a slope in an absolute value of 7 or more.
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公开(公告)号：US11975242B2
公开(公告)日：2024-05-07
申请号：US18077562
申请日：2022-12-08
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Ayaka Shindo , Takahiro Shigemitsu , Kazuyoshi Shiga , Toshiyuki Tarao , Takanobu Kawamura
CPC classification number: A63B37/0039 , A63B37/0012 , A63B37/0031 , A63B37/0076 , A63B37/0024
Abstract: An object of the present disclosure is to provide a golf ball having good shot feeling and excellent durability and not having lowered resilience even if a hard cover material is used. The present disclosure provides a golf ball comprising a spherical core, and a cover disposed outside the spherical core and composed of one or more layers, wherein at least one cover layer contains (A) a base resin, and (B) at least one member selected from the group consisting of a polyrotaxane, a polyethylene oxide, a polypropylene oxide, a polycaprolactone and a liquid polymer, and Sa×Spc≥100 wherein Sa (μm) is an arithmetic mean roughness of a surface of a cut plane of the cover, and Spc (mm−1) is an arithmetic mean curvature of a summit of the surface of the cut plane of the cover.
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公开(公告)号：US11826615B2
公开(公告)日：2023-11-28
申请号：US16887073
申请日：2020-05-29
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Kai Hayashi , Kazuyoshi Shiga , Hikaru Nagakura , Takahiro Shigemitsu
CPC classification number: A63B37/0051 , C08L9/00 , A63B37/0063 , A63B37/0064
Abstract: An object of the present invention is to provide a cured product of a golf ball rubber composition imparting excellent durability. The present invention provides a cured product of a golf ball rubber composition cured from a golf ball 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, and (c) a crosslinking initiator, wherein the cured product of the golf ball rubber composition satisfies the following mathematical formula (1):
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公开(公告)号：US11684823B2
公开(公告)日：2023-06-27
申请号：US17105802
申请日：2020-11-27
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Kai Hayashi , Takahiro Shigemitsu , Kazuyoshi Shiga , Yoshihiko Komori , Toshiyuki Tarao , Masatoshi Yokota
CPC classification number: A63B37/00376 , A63B37/0024 , A63B37/0074 , A63B37/00373 , C08L75/08 , C09K11/02 , A63B37/0075 , A63B37/0076 , A63B2209/00 , C08L2201/08 , C08L2205/18 , C08L2310/00
Abstract: An object of the present invention is to provide a golf ball having excellent color development stability. The present invention provides a golf ball comprising a core and a cover covering the core, wherein the cover is formed from a resin composition containing a first base resin and a fluorescent pigment, and the fluorescent pigment has a number-based cumulative median size of 2.5 μm or more.
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公开(公告)号：US11565154B2
公开(公告)日：2023-01-31
申请号：US16993056
申请日：2020-08-13
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Ayaka Shindo , Takumi Kaneko , Hiroshi Tadaoka , Takahiro Shigemitsu , Kazuyoshi Shiga
Abstract: An object of the present invention is to provide a golf ball having a decreased spin rate on driver shots. The present invention provides a golf ball comprising 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) a compound represented by the formula (1) as a co-crosslinking agent, and (c) a crosslinking initiator, (R1COO)M(OCOR2)m (1) in the formula (1), M represents a metal atom, m represents 1 or 2, R1 and R2 are different from each other, represent an alkenyl group having 2 to 30 carbon atoms or an alkynyl group having 2 to 30 carbon atoms and have a carbon-carbon double bond or a carbon-carbon triple bond at an α-position carbon atom bonding to the carbonyl group, and when m is 2, two of R2 may be identical to or different from each other.
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