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    Production method of modified diene-based polymer
    1.
    发明授权
    Production method of modified diene-based polymer 有权

    公开(公告)号：US11787879B2

    公开(公告)日：2023-10-17

    申请号：US17711208

    申请日：2022-04-01

    Applicant: Sumitomo Rubber Industries, Ltd.

    Inventor： Takumi Kaneko ,  Kazuyoshi Shiga ,  Shigeru Yamago

    IPC: C08F8/34 ,  C08F10/08 ,  C08F2/48 ,  C08F136/06 ,  C08C19/00 ,  C08C19/20 ,  C08L9/00

    CPC classification number: C08F8/34 ,  C08F10/08

    Abstract: An object of the present invention is to provide a production method of a diene-based polymer that can control the crosslinking morphology. The present invention provides a method for producing a modified diene-based polymer having a structure represented by the formula (1), comprising a first step of mixing a diene-based polymer and a dithioester compound to prepare a mixture; and a second step of irradiating a ray to the mixture under an inert atmosphere.




    [In the formula (1), R1 and R2 represent an alkyl group having 1 or more carbon atoms, an aryl group having 6 or more carbon atoms, an aralkyl group having 6 or more carbon atoms, a hydrogen atom, or a halogen atom; and Z is an organic group, an organic group where a part of hydrogen atom of the above organic group is substituted, a hydrogen atom, or a halogen atom.]

    Golf ball
    2.
    发明授权
    Golf ball 有权

    公开(公告)号：US11731006B2

    公开(公告)日：2023-08-22

    申请号：US16719349

    申请日：2019-12-18

    Applicant: Sumitomo Rubber Industries, Ltd.

    Inventor： Yasuo Naito ,  Yuko Oka ,  Shimpei Oyama ,  Tetsuro Abe ,  Kazuyoshi Shiga

    IPC: A63B37/14 ,  A63B37/00

    CPC classification number: A63B37/0037 ,  A63B37/00221 ,  A63B37/0024

    Abstract: An object of the present invention is to provide a novel golf ball having excellent spin performance on approach shots. The present invention provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein a base resin constituting an outermost layer of the paint film is a polyurethane obtained by a reaction between (A) a polyol composition and (B) a polyisocyanate composition, and a loss modulus (E″) at the temperature of −50° C. obtained by measuring a dynamic viscoelasticity of the polyurethane is 1.00×108 Pa or more.

    Golf ball
    3.
    发明授权
    Golf ball 有权

    公开(公告)号：US11358033B2

    公开(公告)日：2022-06-14

    申请号：US16869991

    申请日：2020-05-08

    Applicant: Sumitomo Rubber Industries, Ltd.

    Inventor： Hikaru Nagakura ,  Kazuyoshi Shiga ,  Kai Hayashi ,  Takahiro Shigemitsu

    IPC: A63B37/06 ,  A63B37/00 ,  C08L9/00

    Abstract: An object of the present invention is to provide a golf ball having excellent durability. The present invention provides a golf ball comprising a core and at least one cover layer covering the core, wherein the core is formed from a core 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, and (d) a hindered phenol compound, and (b) the co-crosslinking agent and (d) the hindered phenol compound are blended in the core rubber composition such that the following expression (1) is satisfied: 0.04≤HF/B≤0.35  (1) in the formula (1), HF=a number of OH functional group in one molecule of (d) the hindered phenol compound×an amount of (d) the hindered phenol compound (mole) with respect to 100 parts by mass of (a) the base rubber, and B=an amount of (b) the co-crosslinking agent (mole) with respect to 100 parts by mass of (a) the base rubber.

    Golf ball
    4.
    发明授权
    Golf ball 有权

    公开(公告)号：US11148011B2

    公开(公告)日：2021-10-19

    申请号：US16233790

    申请日：2018-12-27

    Applicant: Sumitomo Rubber Industries, Ltd.

    Inventor： Hikaru Nagakura ,  Kazuyoshi Shiga ,  Ryota Sakamine

    IPC: A63B37/04 ,  C08L9/00 ,  A63B37/00 ,  C08K5/56 ,  C08K3/22 ,  C08K3/30 ,  C08K5/098 ,  C08K5/14 ,  A63B45/00

    Abstract: An object of the present invention is to provide a golf ball having excellent impact durability. 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 core 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 crosslinkable compound having two or more polymerizable unsaturated bonds in the molecule, and (d) a crosslinking initiator.

    Golf ball
    5.
    发明授权
    Golf ball 有权

    公开(公告)号：US11097162B2

    公开(公告)日：2021-08-24

    申请号：US16586395

    申请日：2019-09-27

    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.

    Inventor： Hikaru Nagakura ,  Kazuyoshi Shiga ,  Ryota Sakamine

    IPC: A63B37/04 ,  C08L9/00 ,  A63B37/00

    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 the core is formed from a core rubber composition containing (a) a base rubber containing a polybutadiene, (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, and (d) a terpene-based resin.

    Rubber composition for tennis ball
    6.
    发明授权
    Rubber composition for tennis ball 有权

    公开(公告)号：US11078348B2

    公开(公告)日：2021-08-03

    申请号：US16702431

    申请日：2019-12-03

    Applicant: Sumitomo Rubber Industries, Ltd.

    Inventor： Takehiko Hyodo ,  Masanori Taguchi ,  Kazuyoshi Shiga ,  Fumiya Suzuki ,  Hiroaki Tanaka ,  Kunio Niwa

    IPC: C08L7/00 ,  A63B39/02 ,  C08K3/04 ,  C08K3/34 ,  C08L21/00 ,  C08L9/00 ,  A63B39/00

    Abstract: A rubber composition for a tennis ball includes a base rubber and a high-flatness filler. The high-flatness filler has an average particle diameter D50 of not less than 1 μm and not greater than 50 μm. A degree of flatness DL is not less than 40 and not greater than 200. An amount of the high-flatness filler per 100 parts by weight of the base rubber is not less than 5 parts by weight and not greater than 100 parts by weight. A ratio (E2/E1) of a tensile elastic modulus E2 in a tensile strain range from 70% to 100% to a tensile elastic modulus E1 in a tensile strain range from 10% to 30%, of a vulcanized rubber obtained by vulcanizing the rubber composition, is not less than 0.60 and less than 1.00. The tennis ball includes a hollow core formed from the rubber composition.

    Complex and process for preparing complex
    7.
    发明授权
    Complex and process for preparing complex 有权

    公开(公告)号：US10975103B2

    公开(公告)日：2021-04-13

    申请号：US16450608

    申请日：2019-06-24

    Applicant: Sumitomo Rubber Industries, Ltd.

    Inventor： Hiroshi Tadaoka ,  Chiemi Mikura ,  Kazuyoshi Shiga

    IPC: C07F3/00

    Abstract: An object of the present invention is to provide a novel complex having at least two carbon-carbon double bonds and/or carbon-carbon triple bonds. The present invention provides a complex represented by a structural formula (2): [In the structural formula (2), M1 to M4 are identical to or different from each other and represent a metal atom, R1 to R6 are identical to or different from each other and represent a hydrogen atom, an alkyl group having 1 to 24 carbon atoms, an alkenyl group having 2 to 18 carbon atoms or an alkynyl group having 2 to 18 carbon atoms, at least two of R1 to R6 are the alkenyl group having 2 to 18 carbon atoms or the alkynyl group having 2 to 18 carbon atoms, and at least one of R1 to R6 is the alkyl group having 6 to 24 carbon atoms].

    Complex and process for preparing complex
    9.
    发明授权
    Complex and process for preparing complex 有权

    公开(公告)号：US10562919B2

    公开(公告)日：2020-02-18

    申请号：US15850954

    申请日：2017-12-21

    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.

    Inventor： Hiroshi Tadaoka ,  Kazuyoshi Shiga

    IPC: C07F3/06 ,  C07F3/00

    Abstract: An object of the present invention is to provide a novel complex having at least one carbon-carbon double bond and/or carbon-carbon triple bond. The present invention provides a complex represented by formula (1): ((RCOO)8M5(OH)2)n   (1) wherein 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, a plurality of R 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, and n is an integer of 1 or more.

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