Golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsJun Shindo, Takahiro Hayashi
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Abstract
The present invention provides a golf ball having a core, an inner cover layer and an outer cover layer. The core is made of a material obtained by molding under heat a rubber composition containing (a) a base rubber containing polybutadiene having a stress relaxation time (T80), (b) an unsaturated carboxylic acid and/or a metal salt thereof, and (c) an organic peroxide. The inner cover layer has a Shore D hardness of from 10 to 60, and the outer cover layer has a Shore D hardness of from 50 to 80 which is higher than the Shore D hardness of the inner cover layer. The golf ball has an excellent rebound overall, a good, soft feel on impact, and can travel further when played.
Claims5
A golf ball comprising a core, an inner cover layer and an outer cover layer, wherein the core is made of a material obtained by molding under heat a rubber composition comprising (a) a base rubber containing polybutadiene having a stress relaxation time (T80), defined as the time in seconds from the moment when rotation is stopped immediately after measurement of the ML1+4 (100° C.) value (the Mooney viscosity measured at 100° C. in accordance with ASTM D-1646-96) that is required for the ML1+4 value to decrease 80%, of 3.5 or less, (b) an unsaturated carboxylic acid and/or a metal salt thereof, and (c) an organic peroxide;
- the inner cover layer has a Shore D hardness of from 10 to 60;
- and the outer cover layer has a Shore D hardness of from 50 to 80 which is higher than the Shore D hardness of the inner cover layer.
Dependencies are inferred from the claim text.