Golf ball
AssigneeDunlop Sports Co. Ltd.
InventorToshiyuki Tarao
Life of this patent
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Abstract
An object of the present invention is to provide a golf ball with an improved controllability by enhancing a dry spin rate and wet spin rate in a so-called distance type golf ball. The present invention provides a golf ball comprising a constituting member that is formed from a polyurethane composition containing, as a resin component, a polyurethane elastomer using 1,4-bis(isocyanatomethyl)cyclohexane as a polyisocyanate component, wherein the polyurethane composition has a shear loss modulus G″ of more than 5.03×106 Pa and 1.17×108 Pa or less when measured in a shear mode using a dynamic viscoelasticity measuring apparatus at the conditions of the temperature of 0° C., and the oscillation frequency of 10 Hz.
Claims16
A golf ball comprising a core and a cover covering the core, wherein the cover is formed from a polyurethane composition containing, as a resin component, a polyurethane elastomer formed from 1,4-bis(isocyanatomethyl)cyclohexane as the only polyisocyanate component,
- wherein the resin component of the polyurethane composition contains the polyurethane elastomer in a content of 50 mass % or more, and
- wherein the polyurethane composition has a rebound resilience of 39% or more and a shear loss modulus G″ of more than 5.03 x106 Pa and 1.17 x108 Pa or less when measured in a shear mode using a dynamic viscoelasticity measuring apparatus at the conditions of the temperature of 0 ° C., and the oscillation frequency of 10 Hz.
A golf ball comprising a core and a cover covering the core, wherein the cover is formed from a polyurethane composition containing, as a resin component, a polyurethane elastomer formed from 1,4-bis(isocyanatomethyl)cyclohexane as the only polyisocyanate component and the cover has a slab hardness ranging from 50 to 65 in Shore D hardness,
- wherein the resin component of the polyurethane composition contains the polyurethane elastomer in a content of 50 mass % or more, and
- wherein the polyurethane composition has a rebound resilience of 39% or more and a shear loss modulus G″ of more than 5.03 x106 Pa and 1.17 x108 Pa or less when measured in a shear mode using a dynamic viscoelasticity measuring apparatus at the conditions of the temperature of 0° C., and the oscillation frequency of 10 Hz.
Dependencies are inferred from the claim text.