IP Library › Granted Patent US 7,140,978
Granted Patent B2
US 7,140,978 · App. 10/733,660 · Granted Nov 28, 2006

Multi-layer golf ball

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Quick Facts
Patent No.
US 7,140,978
App. No.
10/733,660
Granted
Nov 28, 2006
Kind
B2
Abstract

Disclosed herein is a multi-layer golf ball having a soft outer cover. The golf ball has an inner cover layer with a Shore D hardness of 60 or more, and an outer cover with a Shore D hardness of 55 or less, and more preferably 50 or less. In a particularly preferred form of the invention, the outer cover comprises at least 75% of a soft copolymer formed from a polyolefin, an unsaturated carboxylic acid, and a monomer of the acrylate ester class. The golf ball of the invention has exceptionally soft feel and high spin rates on short shots of 80 yards or less and, particularly, 40 yards or less, while maintaining good distance and average spin on full shots.

Claims (10)

1. A golf ball comprising:

a core, the core having a diameter ranging from 1.2 inches to 1.6 inches, a mass ranging from 25 to 40 grams, a PGA compression 70 or less, and a coefficient of restitution greater than 0.750 at an incoming speed of 125 feet per second;

an inner cover layer which has a Shore D hardness of at least 60 as measured on the curved surface thereof and is formed from a composition which includes at least one material selected from the group consisting of polyamides, polyester elastomers, polyester amides, metallocene catalyzed polyolefins, and blends thereof, the inner cover layer having a thickness ranging from 0.03 inch to 0.07 inch; and

an outer cover layer formed over the inner cover layer, the outer cover layer having a Shore D hardness of no more than 55 as measured on the curved surface thereof;

wherein the golf ball has a spin factor of at least 5.

2. A golf ball comprising:

a solid core, the solid core having a diameter ranging from 1.2 inches to 1.6 inches, a mass ranging from 25 to 40 grams, a PGA compression 70 or less, and a coefficient of restitution greater than 0.750 at an incoming speed of 125 feet per second;

an inner cover layer which has a Shore D hardness of at least 60 as measured on the curved surface thereof and is formed from a composition which includes at least one material selected from the group consisting of polyamides, polyester elastomers, polyester amides, metallocene catalyzed polyolefins, and blends thereof, wherein the inner cover layer has a thickness ranging from 0.03 inch to 0.07 inch; and

an outer cover layer formed over the inner cover layer, the outer cover layer having a Shore D hardness of no more than 55 as measured on the curved surface thereof, wherein the outer cover layer has a thickness of from about 0.01 to about 0.10 inches;

wherein the golf ball has a spin factor of at least 8.