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    3.
    发明专利
    未知

    公开(公告)号：DE69411825D1

    公开(公告)日：1998-08-27

    申请号：DE69411825

    申请日：1994-08-26

    Applicant: SUMITOMO RUBBER IND

    Inventor： YAMADA MIKIO ,  KITAOH KATSUTOSHI ,  HORIUCHI KUNIYASU

    IPC: A63B37/00 ,  A63B37/14 ,  C09D7/12 ,  A63B37/12 ,  C05D5/00

    Abstract: Disclosed is a clear paint for a golf ball to be coated on the surface of the golf ball, which comprises 100 parts by weight (solid) of a clear paint resin, 0.01 to 2 parts by weight of a fluorescent brightener and 0.001 to 0.5 parts by weight of a blue pigment. A golf ball, the surface of which is coated with the clear paint is also disclosed.

    Two-piece golf ball
    4.
    发明专利
    Two-piece golf ball 未知

    公开(公告)号：GB2288604B

    公开(公告)日：1998-01-14

    申请号：GB9508296

    申请日：1995-04-24

    Applicant: SUMITOMO RUBBER IND

    Inventor： YOKOTA MASATOSHI ,  HORIUCHI KUNIYASU ,  HIRAOKA HIDENORI ,  YAMADA MIKIO

    IPC: A63B37/00 ,  A63B37/04 ,  A63B37/12 ,  C08L23/26

    Abstract: A two-piece golf ball, comprising: a core having a surface hardness of 55 to 75 and a sectional hardness at the location other than the core surface layer of 65 to 88, said hardness value being determined by a JIS-C type hardness tester; and a cover covering said core and having a stiffness of 1,000 to 3,000 kg/cm2; wherein said golf ball exhibits a contact area S between itself and a clubface, when hit with a driver at a head speed of 40 m/second, of 4.3 to 5.0 cm2, S being determined by the equation: S= pi (+E,fra 1/2+EE {(a+b)/2})2 wherein a is a transverse diameter of the contact area and b is a longitudinal diameter of the contact area.

    5.
    发明专利
    未知

    公开(公告)号：DE69312245T2

    公开(公告)日：1997-12-04

    申请号：DE69312245

    申请日：1993-12-20

    Applicant: SUMITOMO RUBBER IND

    Inventor： YAMADA MIKIO ,  YABUKI YOSHIKAZU ,  ENDO SEIICHIRO

    IPC: A63B37/00 ,  A63B37/04 ,  A63B37/06 ,  A63B37/08 ,  C08L9/00 ,  C08L21/00

    Abstract: The present invention provides a rubber composition having a high impact resilience, and improved processability and workability which may be used for the manufacture of a one-piece solid golf ball, the solid core of multi-layered solid golf balls or the solid centre of thread-wound golf balls. The rubber composition is characterized in that the rubber component is made from a mixture of: (1) 60 to 95 wt% of a polybutadiene containing at least more than 40% of cis-1,4-bonds and having a Mooney viscosity [ML1+4(100 DEG C)] of 50 to 70, obtained by using a lanthanum rare earth-based catalyst, nickel-based catalyst or cobalt-based catalyst, or a mixture thereof with another polybutadiene obtained by using a catalyst other than the above mentioned one, and (2) 5 to 40 wt% of a polyisoprene containing at least more than 90% of cis-1,4-bonds and a Mooney viscosity of 70 to 90.

    10.
    发明专利
    未知

    公开(公告)号：DE69101617T2

    公开(公告)日：1994-08-25

    申请号：DE69101617

    申请日：1991-10-18

    Applicant: SUMITOMO RUBBER IND

    Inventor： YAMADA MIKIO

    IPC: A63B37/00 ,  A63B37/12 ,  C08L23/08

    Abstract: The present invention provides a golf ball having excellent impact resilience and good flying performance, which comprises a core and a cover for covering the core, wherein the cover contains an ionomer resin as a main material and the ionomer resin has the first peak at 85 to 95 DEG C and the second peak at 70 to 80 DEG C in its crystal melting behavior attended with the measurement by a differential scanning calorimeter. A process for producing the above golf ball is also disclosed.

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