Golf ball incorporating at least three adjacent ionomeric and/or HNP-based layers having multiple related property gradients there between
Golf ball having at least three layers comprising an ionomeric and/or HNP composition, wherein for each two adjacent layers there is a relationship between a ratio of the volumes of the two adjacent layers and a ratio of the percent (%) neutralizations of those two layers such that the volumes and % neutralizations of all layers are interrelated and interdependent to produce unique and desirable playing characteristics. In one embodiment, a golf ball of the invention has T layers, wherein T≧3 and each of the T layers has a different volume “V” and comprises an ionomeric and/or HNP composition having a different % neutralization “N”. Furthermore, each inner layer n of the T layers (n<T) has an adjacent surrounding layer n+1 such that a volume V n and a % neutralization N n of each inner layer and a volume V (n+1) and % neutralization N (n+1) of each adjacent surrounding layer n+1 satisfy the relationship (V n −V (n+1) )/V n ≦(N (n+1) −N n )/N n .
1. A golf ball having T layers, wherein each of T layers has a different volume V and comprises an ionomeric composition having a different % neutralization N; wherein each of n inner layers of the T layers has an adjacent surrounding layer n+1 such that a volume V n and a % neutralization N n of each inner layer and a volume V (n+1) and % neutralization N (n+1) of each adjacent surrounding layer n+1 satisfy the relationship
V n −V (n+1) )/ V n ≦( N (n+1) )− N n )/ N n ,
wherein T=3 and n=2, and the n inner layers include a first layer surrounded by an adjacent second layer, and
wherein the first layer has a first volume V 1 ; the second layer has a second volume V 2 ; and a third layer has a third volume V 3 ; wherein V 3 <V 2 <V 1 .
2. The golf ball of claim 1 , wherein N for the ionomeric composition of first layer is 55 or less.
3. The golf ball of claim 2 , wherein N for the ionomeric composition of the second layer is from 50 to 90.
4. The golf ball of claim 3 , wherein N for the ionomeric composition of the third layer is greater than 90.
5. The golf ball of claim 4 , wherein the first layer has a first outer diameter OD 1 ; the second layer has a second outer diameter OD 2 ; and the third layer has a third outer diameter OD 3 ; wherein OD 3 >OD 2 >OD 1 and OD 1 is about 1.55 inches or less, and OD 2 is up to about 1.64 inches.
6. The golf ball of claim 5 , wherein OD 1 is about 1.53 inches, OD 2 is about 1.62 inches; and OD 3 is about 1.683 inches.
7. The golf ball of claim 6 , wherein the first layer has a first outer surface comprising a first outer surface hardness of at least 30 Shore D; the second layer has a second outer surface comprising a second outer surface hardness of at least 60 Shore D; and the third layer has a third outer surface comprising a third outer surface hardness of less than 65 Shore D.
8. The golf ball of claim 1 , wherein at least two adjacent layers of the T layers have uniform thicknesses.
9. The golf ball of claim 1 , wherein at least two adjacent layers of the T layers have non-uniform thicknesses.
10. A golf ball having T layers, wherein each of T layers has a different volume V and comprises an ionomeric composition having a different % neutralization N; wherein each of n inner layers of the T layers has an adjacent surrounding layer n+1 such that a volume V n and a % neutralization N n of each inner layer and a volume V (n+1) and % neutralization N (n+1) of each adjacent surrounding layer n+1 satisfy the relationship
V n −V (n+1) )/ V n ≦( N (n+1) −N n )/ N n ,
wherein T=4 and n=3, and the n inner layers include a first layer, surrounded by an adjacent second layer, surrounded by an adjacent third layer, and
wherein the first layer has a first volume V 1 ; the second layer has a second volume V 2 ; the third layer has a third volume V 3 , and a fourth layer has a fourth volume V 4 ; wherein V 4 <V 3 <V 2 <V 1 .
11. The golf ball of claim 10 , wherein N for the ionomeric composition of first layer is 55 or less.
12. The golf ball of claim 11 , wherein N for the ionomeric composition of the second layer is from 50 to 75.
13. The golf ball of claim 12 , wherein N for the ionomeric composition of the third layer is from 70 to 90.
14. The golf ball of claim 13 , wherein N for the ionomeric composition of a fourth layer of the golf ball is greater than 90.
15. The golf ball of claim 14 , wherein the first layer has a first outer diameter OD 1 ; the second layer has a second outer diameter OD 2 ; the third layer has a third outer diameter OD 3 ; and the fourth layer has a fourth outer diameter OD 4 ; wherein OD 4 >OD 3 >OD 2 >OD 1 and OD 1 is about 1.3 inches or less, OD 2 is up to about 1.55 inches; and OD 3 is up to about 1.64 inches.
16. The golf ball of claim 15 , wherein OD 1 is about 1.25 inches, OD 2 is about 1.51 inches; OD 3 is about 1.62 inches; and OD 4 is about 1.683 inches.
17. The golf ball of claim 16 , wherein the first layer has a first outer surface comprising a first outer surface hardness of 20 Shore D or greater; the second layer has a second outer surface comprising a second outer surface hardness of at least 40 Shore D; the third layer has a third outer surface comprising a third outer surface hardness of at least 60 Shore D; and the fourth layer has a fourth outer surface comprising a fourth outer surface hardness of 65 Shore D or less.