FORMULATING TECHNIQUE FOR CASTING ALIPHATIC GOLF BALL COVERS
A golf ball having a cover is cast from a castable reactive aliphatic functional composition consisting essentially of: a methylene dicyclohexyl diisocyanate based prepolymer; at least one polyamine/polyamide functional component used as a backbone of the prepolymer; a free isocyanate group; and a curative. The polyamine/polyamide is formed from the condensation reaction of a polyamine and a polyacid, with the equivalent ratio of polyamine to polyacid ranges from 2:1 to 10:1, preferably the ratio is 3:1, and more preferably 2:1. It is preferable that the polyamine be a Jeffamine series D-2000. The polyacid can be chosen from acids such as maleic, adipic, azelaic or sebacic. It is preferable that the prepolymer be a polyurethane or urea. The formulating techniques eliminate the need for post curing when using aliphatic chemistries in golf ball covers.
1 . A golf ball comprising:
a core; and
a cover,
wherein the cover is cast from a castable reactive aliphatic functional composition consisting essentially of: a methylene dicyclohexyl diisocyanate based prepolymer; at least one polyamine/polyamide functional component used as a backbone of the prepolymer; a free isocyanate group; and a curative.
2 . The golf ball of claim 1 , wherein the polyamine/polyamide is formed from the condensation reaction of a polyamine and a polyacid, with the equivalent ratio of polyamine to polyacid ranges from 2:1 to 10:1.
3 . The golf ball of claim 2 , wherein the equivalent ration is 3:1.
4 . The golf ball of claim 2 , wherein the equivalent ration is 2:1.
5 . The golf ball of claim 1 , wherein the polyamine is a Jeffamine series D-2000.
6 . The golf ball of claim 1 , wherein the polyacid may be is selected from the group consisting of maleic acid, adipic acid, azelaic acid and sebacic acid.
7 . The golf ball of claim 1 , wherein the prepolymer is a polyurethane.
8 . The golf ball of claim 1 , wherein the prepolymer is urea.
9 . The golf ball of claim 1 wherein the free isocyanate group is 6.4% of the cover composition.
10 . A golf ball comprising:
a core; and
a cover,
wherein the cover is cast from a castable reactive aliphatic functional composition consisting essentially of: a methylene dicyclohexyl diisocyanate based prepolymer; a free isocyanate group; and a curative including at least one polyamine/polyamide functional component
11 . The golf ball of claim 1 , wherein the polyamine/polyamide functional component is formed from the condensation reaction of a polyamine and a polyacid, with the equivalent ratio of polyamine to polyacid ranges from 2:1 to 10:1.
12 . The golf ball of claim 2 , wherein the equivalent ration is 3:1.
13 . The golf ball of claim 2 , wherein the equivalent ration is 2:1.
14 . The golf ball of claim 1 , wherein the polyamine is a Jeffamine series D-2000.
15 . The golf ball of claim 1 , wherein the polyacid may be is selected from the group consisting of maleic acid, adipic acid, azelaic acid and sebacic acid.
16 . The golf ball of claim 1 , wherein the prepolymer is a polyurethane.
17 . The golf ball of claim 1 , wherein the prepolymer is urea.
18 . The golf ball of claim 1 wherein the free isocyanate group is 6.4% of the cover composition.