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公开(公告)号：DE69101617D1
公开(公告)日：1994-05-11
申请号：DE69101617
申请日：1991-10-18
Applicant: SUMITOMO RUBBER IND
Inventor： YAMADA MIKIO
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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公开(公告)号：GB2228010B
公开(公告)日：1992-06-03
申请号：GB8929273
申请日：1989-12-28
Applicant: SUMITOMO RUBBER IND
Inventor： HIRAOKA HIDENORI , KITAOH KATSUTOSHI , MARUOAKA KIYOTO , YAMADA MIKIO
IPC: A63B37/00 , A63B37/04 , C08F279/02
Abstract: A one-piece golf ball exhibiting an increased flying distance and a high durability suitable for golf driving ranges, i.e. a solid golf ball having a central hardness (JIS-C hardness) of 60 to 75, a hardness at a position 10 mm from the center of 72 to 80 and a surface hardness of 70 to 85, whereby the central hardness is minimum, and the difference between the maximum hardness and the minimum hardness is 15 or less, said golf ball being obtained by vulcanizing and molding a rubber composition comprising (a) 100 parts by weight of polybutadiene rubber, mainly comprising high-cis-polybutadiene rubber containing the cis-1,4-structure in a quantity of at least 96% and having a Mooney viscosity of 48 to 85 synthesized by the use of a nickel-containing catalyst; (b) 0.1 to 2.0 parts by weight of 2,5-di-t-butylhydroquinone as a vulcanization stabilizer; (c) 10 to 50 parts by weight of unsaturated carboxylic acids and/or salts thereof; and (d) 0.5 to 5 parts by weight of a free radical initiator.
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公开(公告)号：AU6865591A
公开(公告)日：1992-01-30
申请号：AU6865591
申请日：1991-01-02
Applicant: SUMITOMO RUBBER IND
Inventor： YAMADA MIKIO , OKA KENGO
Abstract: A golf ball with dimples 2,2A,2B disposed in a regular octahedral arrangement having a superior symmetrical property so as to arrange dimples 2,2A,2B symmetrically in each of numerously divided regions S((1)-(18)),T((1')-8')) without deteriorating the symmetrical property of the golf ball and by varying volumes of dimples 2,2A,2B adjacent to each other at a specified ratio with diameters thereof equal to each other, thereby to provide a symmetrical property and uniformity for flying a long distance.
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公开(公告)号：CA2033550A1
公开(公告)日：1992-01-28
申请号：CA2033550
申请日：1991-01-03
Applicant: SUMITOMO RUBBER IND
Inventor： YAMADA MIKIO , OKA KENGO
IPC: A63B37/00
Abstract: A golf ball with dimples disposed in a regular octahedral arrangement having a superior symmetrical property so as to arrange dimples symmetrically in each of numerously divided regions without deteriorating the symmetrical property of the golf ball and by varying volumes of dimples adjacent to each other at a specified ratio with diameters thereof equal to each other, thereby to provide a symmetrical property and uniformity for flying a long distance.
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公开(公告)号：FR2637810A1
公开(公告)日：1990-04-20
申请号：FR8913576
申请日：1989-10-17
Applicant: SUMITOMO RUBBER IND
Inventor： YAMADA MIKIO , NAKAMURA YOSHINOBU
Abstract: The present invention provides a golf ball covering with a special ionomer resin mixture having improved properties. The special ionomer resin mixture has a melt index of 0.5 to 3.0 and a Shore D hardness of at least 65, and is prepared by mixing three ionomer resins in specific amount ratios.
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Patent Agency Ranking
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公开(公告)号：GB2124910A
公开(公告)日：1984-02-29
申请号：GB8320397
申请日：1983-07-28
Applicant: SUMITOMO RUBBER IND
Inventor： YAMADA MIKIO
IPC: A63B53/04 , A63B102/32
Abstract: A golf putter has a face portion in the putter head wherein the central or the entire area of the face portion is formed by a face plate 4 made from a material which is substantially equivalent to or slightly lower than the covering material of two-piece balls with respect to hardness.
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公开(公告)号：GB2317834B
公开(公告)日：2000-08-02
申请号：GB9721262
申请日：1997-10-07
Applicant: SUMITOMO RUBBER IND
Inventor： KATO AKIRA , YAMADA MIKIO
Abstract: A multi-layer structured golf ball having high initial velocity at low head speed region and excellent flight performance, while maintaining the characteristics inherent in conventional thread wound golf balls, i.e. good shot feel, wherein the multi-layer structured golf ball has (a) a solid core having a diameter of 23 to 37 mm, and a deformation amount of 2.5-10 mm with a load of 10 kgf to 130 kgf (b) an intermediate cover having a thickness of 0.5 to 5.0 mm and formed from a thermoplastic resin on the solid core, (c) a thread rubber layer having a thickness of 1.0 to 5.0 mm, formed on the intermediate cover, and (d) an outer cover covering the thread rubber layer, formed from a thermoplastic resin.
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公开(公告)号：AU720251B2
公开(公告)日：2000-05-25
申请号：AU3997397
申请日：1997-10-07
Applicant: SUMITOMO RUBBER IND
Inventor： KATO AKIRA , YAMADA MIKIO
Abstract: A multi-layer structured golf ball having high initial velocity at low head speed region and excellent flight performance, while maintaining the characteristics inherent in conventional thread wound golf balls, i.e. good shot feel, wherein the multi-layer structured golf ball has (a) a solid core having a diameter of 23 to 37 mm, and a deformation amount of 2.5-10 mm with a load of 10 kgf to 130 kgf (b) an intermediate cover having a thickness of 0.5 to 5.0 mm and formed from a thermoplastic resin on the solid core, (c) a thread rubber layer having a thickness of 1.0 to 5.0 mm, formed on the intermediate cover, and (d) an outer cover covering the thread rubber layer, formed from a thermoplastic resin.
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公开(公告)号：AU702156B2
公开(公告)日：1999-02-18
申请号：AU6559896
申请日：1996-09-13
Applicant: SUMITOMO RUBBER IND
Inventor： YOKOTA MASATOSHI , MORIYAMA KEIJI , YAMADA MIKIO
IPC: A63B37/00 , A63B37/02 , A63B37/04 , A63B37/12 , B29D99/00 , B29K9/00 , C08K5/04 , C08K5/09 , C08L9/00 , A63B37/14 , A63B37/06
Abstract: A solid golf ball having good controllability and long flight distance which utilizes a solid core and a cover covering the core, wherein the core is formed from a rubber composition comprising a polybutadiene rubber having a cis-1,4-structure content of at least 40% and either an unsaturated carboxylic acid or a metal salt thereof or both, and the cover has a thickness of 1 to 4 mm, a Shore D hardness of 55 to 64 and has 300 to 450 dimples having a diameter of 2 to 5 mm, with the dimples having a dimple area proportion of 62 to 78% and a total dimple volume of 260 to 345 mm3.
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