Multi-Core Golf Ball Having Increased Initial Velocity At High Swing Speeds Relative To Low Swing Speeds

A golf ball comprising:

• an inner core, the inner core being formed primarily of at least one thermoplastic highly neutralized polymer, and the inner core has a diameter of from about 20 mm to about 26 mm;
• an outer core layer, the outer core substantially surrounding the inner core and being made primarily of a thermoset rubber, and the outer core layer has a thickness of from about 5 mm to about 9 mm;
• an inner cover layer, the inner cover layer substantially surrounding the outer core layer;
• and
• an outer cover layer, the outer cover layer substantially surrounding the inner cover layer;
• wherein the inner core has a compression deformation of from about 3.5 mm to about 4.1 mm, the outer core layer has a compression deformation of from about 2.7 mm to about 3.3 mm, and a ratio of the compression deformation of the inner core to the compression deformation of the outer core layer is from about 1.1 to about 1.3;
• the inner core having a first COR, the outer core having a second COR, the second COR being greater than the first COR and having a value of at least 0.8;
• and
• wherein the golf ball has a first initial velocity measured at a club head speed of about 80 mph, the golf ball has a second initial velocity measured at a club head speed of about 125 mph, the initial velocities being otherwise measured under the same conditions, and the difference between the second initial velocity and the first initial velocity is at least about 86 mph.

A golf ball comprising

• an inner core, the inner core consisting essentially of at least one highly neutralized polymer;
• an outer core layer, the outer core substantially surrounding the inner core and being made primarily of a thermoset rubber;
• and
• at least one cover layer;
• wherein the golf ball has a first initial velocity measured at a club head speed of about 80 mph, the golf ball has a second initial velocity measured at a club head speed of about 125 mph, the initial velocities being otherwise measured under the same conditions, and the difference between the second initial velocity and the first initial velocity is at least about 86 mph.