Multi-piece solid golf ball
First Claim
1. A multi-piece solid golf ball, comprising a core, an intermediate layer enclosing the core to form a sphere, and a cover enclosing the intermediate layer, and numerous dimples formed on a surface of the cover, wherein each component has a Shore D hardness, a Deflection amount, an initial velocity (in m/s) and a thickness (in mm), the Deflection amount being defined as an amount of deflection (in mm) under load of a spherical body incurred when the load is increased from an initial value of 98 N (10 kgf) to a final value of 1275 N (130 kgf), and the ball satisfies the following requirements (1) to (4), (11) &
- (12);
(1) (Shore D hardness of the cover)—
(Shore D hardness of the intermediate layer)>
0,(2A) (initial velocity of the core)—
(initial velocity of the ball)≧
0,(3) 0.87 (Deflection amount of the sphere)/(Deflection amount of the core)≦
0.97,(4) the total of the thickness of the intermediate layer and the thickness of the cover is up to 3.0 mm,(11) (Deflection amount of the golf ball)/(Deflection amount of the sphere)≦
0.98, and(12) (Shore D hardness of core surface)—
(Shore D hardness of core center)≧
15,wherein the total number of the dimples is at least 280 and not more than 360,the ball has a coefficient of lift (CL) when hit of at least 0.165 at a Reynolds number of 70,000 and a spin rate of 2,000 rpm, anda coefficient of drag (CD) when hit of not more than 0.230 at a Reynolds number of 180,000 and a spin rate of 2,520 rpm.
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Accused Products
Abstract
In the present invention, by optimizing the balance of Shore D hardness between the intermediate layer and the cover, the balance of Shore D hardness between the surface and the center in the core, the balance of initial velocity between the core and the sphere, and the balance of Deflection amount between the core and the sphere are optimized, and the total thickness of the intermediate layer and the cover, the inventive golf ball is given a good profile of rebound, feel, controllability and durability.
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Citations
11 Claims
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1. A multi-piece solid golf ball, comprising a core, an intermediate layer enclosing the core to form a sphere, and a cover enclosing the intermediate layer, and numerous dimples formed on a surface of the cover, wherein each component has a Shore D hardness, a Deflection amount, an initial velocity (in m/s) and a thickness (in mm), the Deflection amount being defined as an amount of deflection (in mm) under load of a spherical body incurred when the load is increased from an initial value of 98 N (10 kgf) to a final value of 1275 N (130 kgf), and the ball satisfies the following requirements (1) to (4), (11) &
- (12);
(1) (Shore D hardness of the cover)—
(Shore D hardness of the intermediate layer)>
0,(2A) (initial velocity of the core)—
(initial velocity of the ball)≧
0,(3) 0.87 (Deflection amount of the sphere)/(Deflection amount of the core)≦
0.97,(4) the total of the thickness of the intermediate layer and the thickness of the cover is up to 3.0 mm, (11) (Deflection amount of the golf ball)/(Deflection amount of the sphere)≦
0.98, and(12) (Shore D hardness of core surface)—
(Shore D hardness of core center)≧
15,wherein the total number of the dimples is at least 280 and not more than 360, the ball has a coefficient of lift (CL) when hit of at least 0.165 at a Reynolds number of 70,000 and a spin rate of 2,000 rpm, and a coefficient of drag (CD) when hit of not more than 0.230 at a Reynolds number of 180,000 and a spin rate of 2,520 rpm. - View Dependent Claims (2, 3, 4, 5, 6)
- (12);
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7. A multi-piece solid golf ball, comprising a core, an intermediate layer enclosing the core to form a sphere, and a cover enclosing the intermediate layer, and numerous dimples formed on a surface of the cover, wherein each component has a Shore D hardness, a Deflection amount, an initial velocity (in m/s) and a thickness (in mm), the Deflection amount being defined as an amount of deflection (in mm) under load of a spherical body incurred when the load is increased from an initial value of 98 N (10 kgf) to a final value of 1275 N (130 kgf), and the ball satisfies the following requirements (1) to (4), (11) &
- (12);
(1) (Shore D hardness of the cover)—
(Shore D hardness of the intermediate layer)>
0,(2A) (initial velocity of the core)—
(initial velocity of the ball)≧
0,(3) 0.87≦
(Deflection amount of the sphere)/(Deflection amount of the core)≦
0.97,(4) the total of the thickness of the intermediate layer and the thickness of the cover is up to 3.0 mm, (11) (Deflection amount of the golf ball)/(Deflection amount of the sphere)≦
0.98, and(12) (Shore D hardness of core surface)—
(Shore D hardness of core center)≧
15,wherein said intermediate layer comprises (A) an ionomer resin comprising (a-1) an olefinlunsaturated carboxylic acid binary random copolymer and/or a metal ion neutralized product thereof and (a-2) an o lefin/unsaturated carboxylic acid/unsaturated carboxylic acid ester ternary random copolymer and/or a metal ion neutralized product thereof in a weight ratio (a-1)/(a-2) between 100/0 and 0/100, and (B) a non-ionomeric thermoplastic elastomer in a weight ratio A/B between 100/0 and 50/50, and wherein said intermediate layer is made of a mixture comprising 100 parts by weight of a resin component comprising the ionomer resin (A) and the non-ionomeric thermoplastic elastomer (B) in a weight ratio A/B between 100/0 and 50/50, (C) 5 to 80 parts by weight of an organic fatty acid and/or a derivative thereof having a molecular weight of 280 to 1,500, and (D) 0.1 to 10 parts by weight of a basic inorganic metal compound capable of neutralizing un-neutralized acid groups in said resin component and component (C). - View Dependent Claims (8, 9, 10, 11)
- (12);
Specification