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    Rubber composition for tire
    1.
    发明授权
    Rubber composition for tire 有权

    公开(公告)号：US12138962B2

    公开(公告)日：2024-11-12

    申请号：US18576033

    申请日：2022-03-25

    Applicant: The Yokohama Rubber Co., Ltd.

    Inventor： Hiroki Sugimoto ,  Rie Nakajima

    IPC: C08L9/06 ,  B60C1/00 ,  C08K3/00 ,  C08K3/36

    Abstract: A rubber composition contains 10-50 parts by mass of a thermoplastic resin in 100 parts by mass of a diene rubber containing 60 mass % or more of a styrene-butadiene rubber having a styrene content of 5-30 mass % and a vinyl content of 10-35 mass %. In a mixture containing the diene rubber and the thermoplastic resin in a mass ratio of 1:1, a difference (Tga-Tgm) between a theoretical value (Tga) of a glass transition temperature of the mixture calculated based on an average glass transition temperature (Tg1) of the diene rubber and a glass transition temperature (Tg2) of the thermoplastic resin, and a measurement value (Tgm) of a glass transition temperature of the mixture, is 5-50° C., and a difference (Tg2-Tg1) is 110-150° C. An amount of the thermoplastic resin is 30 mass % or more in 100 mass % total of a plasticizer component contained in the rubber composition.

    Rubber composition for tire
    2.
    发明授权
    Rubber composition for tire 有权

    公开(公告)号：US12104046B2

    公开(公告)日：2024-10-01

    申请号：US18576038

    申请日：2022-03-25

    Applicant: The Yokohama Rubber Co., Ltd.

    Inventor： Hiroki Sugimoto ,  Rie Nakajima

    IPC: C08L15/00 ,  B60C1/00 ,  C08K3/36 ,  C08K5/5419

    CPC classification number: C08L15/00 ,  B60C1/0016 ,  C08K3/36 ,  C08K5/5419 ,  C08L2205/03

    Abstract: A rubber composition contains 10-50 parts by mass of a thermoplastic resin in 100 parts by mass of a diene rubber containing 60 mass % or more of a styrene-butadiene rubber having a styrene content of 5-30 mass % and a vinyl content of 10-35 mass %. In a mixture containing the diene rubber and the thermoplastic resin in a mass ratio of 1:1, a difference (Tga−Tgm) between a theoretical value (Tga) of a glass transition temperature of the mixture calculated based on an average glass transition temperature (Tg1) of the diene rubber and a glass transition temperature (Tg2) of the thermoplastic resin, and a measurement value (Tgm) of a glass transition temperature of the mixture, is lower than 5° C., and a difference (Tg2−Tg1) is 50-105° C. An amount of the thermoplastic resin is 30 mass % or more in 100 mass % total of a plasticizer component contained in the rubber composition.

    Rubber composition
    3.
    发明授权
    Rubber composition 有权

    公开(公告)号：US11267954B2

    公开(公告)日：2022-03-08

    申请号：US16485244

    申请日：2018-02-14

    Applicant: THE YOKOHAMA RUBBER CO., LTD.

    Inventor： Hiroki Sugimoto ,  Tsuyoshi Nomaguchi

    IPC: C08L7/00 ,  B60C1/00

    Abstract: A rubber composition including 100 parts by mass of a diene rubber containing natural rubber, and blended with from 40 to 80 parts by mass of carbon black, cobalt neodecanoate borate represented by the following Chemical Formula (1), a phenolic resin, a curing agent, sulfur, and a vulcanization accelerator, wherein the carbon black has DBP oil absorption of from 50×10−5 to 80×10−5 m3/kg, and iodine adsorption of from 100 to 150 g/kg, and a vulcanized rubber has characteristics of a dynamic storage modulus (E′) at a dynamic strain of 2% and at 20° C. of 8 MPa or more, a tangent loss (tan δ) at 60° C. of 0.20 or less, and the number of times of repetition until fracture is caused in a constant strain fatigue test at a strain of 60% and at 400 rpm of 45,000 or more.

    Rubber composition for tire and pneumatic tire
    8.
    发明授权
    Rubber composition for tire and pneumatic tire 有权

    公开(公告)号：US10450454B2

    公开(公告)日：2019-10-22

    申请号：US15507191

    申请日：2015-08-24

    Applicant: The Yokohama Rubber Co., LTD.

    Inventor： Hiroki Sugimoto ,  Makoto Ashiura

    IPC: C08L53/02 ,  C08K3/36 ,  C08L7/00 ,  C08L15/00 ,  B60C1/00

    Abstract: A diene-based rubber contains natural rubber and specific conjugated diene-based rubber. The content of the natural rubber in the diene-based rubber is 30 to 45 mass %. The content of the specific conjugated diene-based rubber in the diene-based rubber is 30 to 70 mass %. The specific conjugated diene-based rubber is conjugated diene-based rubber produced according to a specific production method. In the conjugated diene-based rubber, the aromatic vinyl unit content, the vinyl bond content, and the weight average molecular weight are within a predetermined range. The CTAB adsorption specific surface area of the silica is 180 m2/g or greater. The content of the silica is less than 60 parts by mass per 100 parts by mass of the diene-based rubber.

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