Golf ball, golf ball cover material composition and method of manufacturing the composition
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsDaisuke Irii, Yoshihiro Inomata, Nobuo Suzuki, Kazuyuki Kabe, Michihiko Sugiura
Life of this patent
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Abstract
A golf ball whose core is covered with a cover, wherein the core is constituted of a rubber composition containing polybutadiene rubber and the cover is constituted of a resin composition composed of ionomer resin and diene rubber. A golf ball cover material composition composed of ionomer resin, diene rubber and non-staining antioxidant. A method of manufacturing a golf ball cover material composition constituted by mixing/kneading ionomer resin and diene rubber.
Claims35
A golf ball whose core is covered with a cover, wherein a ratio of flexural rigidity value of said golf ball to flexural rigidity value of said core is 1.8 or more and less than 3.0, and a thickness of said cover is 1.7 to 2.6 mm.
A golf ball whose core is covered with a cover, wherein a ratio of compression value of said golf ball to compression value of said core is 1.2 or more and less than 1.5, and hardness of said cover is Shore D hardness of 62 or less.
A golf ball having a core and a cover covering said core, wherein said core is constituted of a rubber composition which is compounded of 100 parts by weight of matrix rubber containing polybutadiene rubber having 40% or more of cis-1,4-structure and 20 to 40 parts by weight of unsaturated carboxylic acid metal salt having an average particle size of 5.0 μm or less, and said cover is constituted of a resin composition which is composed of ionomer resin and diene rubber dispersed in the ionomer resin and which has Shore D hardness of 65 or less.
A golf ball cover material composition, wherein said composition is composed of 50 to 90 parts by weight of ionomer resin, 10 to 50 parts by weight of diene rubber and 0.1 to 5 parts by weight of non-staining antioxidant, the diene rubber is dispersed in the ionomer resin, and the dispersed diene rubber has a particle diameter of 5.0 um or less.
A method of manufacturing a golf ball cover material composition constituted by kneading ionomer resin and diene rubber and dispersing the diene rubber in the ionomer resin, wherein the ionomer resin and the diene rubber are previously mixed, at a weight ratio (ionomer resin/diene rubber) ranging from 9/1 to 5/5, at such a temperature at which the diene rubber is not crosslinked, and then a resultant mixture is kneaded at such a temperature at which the diene rubber is crosslinked.
A method of manufacturing a golf ball cover material composition constituted by kneading ionomer resin and diene rubber and dispersing the diene rubber in the ionomer resin, wherein pellets of the diene rubber whose surface is sprinkled with ionomer resin powder is mixed with the pellets of the ionomer resin, and then a resultant mixture is kneaded at such a temperature at which the diene rubber is crosslinked.
A method of manufacturing a golf ball cover material composition constituted by kneading ionomer resin and diene rubber and dispersing the diene rubber in the ionomer resin, wherein the pellets of the mixture of the ionomer resin powder and the diene rubber is mixed with the pellets of the ionomer resin, and then the resultant mixture is kneaded at such a temperature at which the diene rubber is crosslinked.
A golf ball having a core applied with a cover, wherein the cover has a Shore D hardness (A) of 63 or below and the golf ball has a compression value (B), the Shore D hardness (A) of the cover having a ratio to the compression value (B) of the golf ball, (A)/(B), within a range of 0.49 to 0.6.
Dependencies are inferred from the claim text.