Golf ball
An ultra-low compression three-piece golf ball is disclosed herein. The core preferably has a PGA compression less than 30. The mantle layer and cover have approximately the same thickness. The cover comprises a thermoplastic polyurethane material and has a specific gravity greater than the core and mantle layer. The golf ball has a PGA compression less than 75 and a COR of at least 0.780.
1. A golf ball consisting essentially of:
a core having a diameter ranging from 1.50 inches to 1.60 inches, the core having a COR of at least 0.780;
a mantle layer disposed over the core, composed of a blend of ionomers, the mantle layer having a thickness ranging from 0.025 inch to 0.040 inch; and
a cover disposed over the mantle layer, the cover composed of a thermoplastic polyurethane material having a Shore A hardness ranging from 70 to 95, the cover having a thickness ranging from 0.025 inch to 0.040 inch;
wherein the cover has a specific gravity greater than the core;
wherein the golf ball has a PGA compression no greater than 75;
wherein the golf ball has an Aggregate Impact Ratio (AI R ) greater than 1.65, wherein
AI R =( CT 150 /CT 75 )×( CA 150 /CA 75 )
wherein CT 150 is a golf ball contact time at an impact speed of 150 feet per second, CT 75 is a golf ball contact time at an impact speed of 75 feet per second, CA 150 is a golf ball contact area at an impact speed of 150 feet per second, and CA 75 is a golf ball contact area at an impact speed of 75 feet per second.
2. The golf ball according to claim 1 wherein the mass of the cover is greater than the mass of the mantle layer.
3. The golf ball according to claim 1 wherein the core further comprises a zinc diacrylate.
4. The golf ball according to claim 1 wherein the mass of the cover is at least 10% of the mass of the golf ball.
5. The golf ball according to claim 1 wherein the core is a multi-layer core.
6. A golf ball consisting essentially of:
a core having a diameter ranging from 1.50 inches to 1.60 inches, the core having a plurality of layers, the core having a COR of at least 0.780;
a mantle layer disposed over the core, composed of a blend of ionomers, the mantle layer having a thickness ranging from 0.025 inch to 0.040 inch; and
a cover disposed over the mantle layer, the cover composed of a thermoplastic polyurethane material having a Shore A hardness ranging from 70 to 95, the cover having a thickness ranging from 0.025 inch to 0.040 inch;
wherein the cover has a specific gravity greater than the core;
wherein the golf ball has an Aggregate Impact Ratio (AI R ) greater than 1.65, wherein
AI R =( CT 150 /CT 75 )×( CA 150 /CA 75 )
wherein CT 150 is a golf ball contact time at an impact speed of 150 feet per second, CT 75 is a golf ball contact time at an impact speed of 75 feet per second, CA 150 is a golf ball contact area at an impact speed of 150 feet per second, and CA 75 is a golf ball contact area at an impact speed of 75 feet per second.
7. The golf ball according to claim 6 wherein the mass of the cover is greater than the mass of the mantle layer.
8. The golf ball according to claim 6 wherein the core further comprises a zinc diacrylate.
9. The golf ball according to claim 6 wherein the mass of the cover is at least 10% of the mass of the golf ball.