Highly-Neutralized Golf Ball Compositions
The present invention is directed to a golf ball and to a process for forming a golf ball having at least one layer, where the layer is formed of a highly neutralized polymer composition having greater than about 70 percent of the acid groups neutralized by a neutralizing agent including ammonium salts, monoamine salts, inner salts, chelates and their ligands, surfactants, phospholipids, ionic liquids, long-chain organic carbonates, main-chain heteroatom-substituted fatty acids, or a combination thereof.
1 . A golf ball comprising at least one layer formed of a reaction product comprising:
a thermoplastic resin component having a first amount of neutralized acid groups; and
a plasticizing agent selected from the group consisting of an inner salt, a chelate, a surfactant, a phospholipid, an ionic liquid, a long-chain organic carbonate, a main-chain heteroatom-substituted fatty acid, and mixtures thereof, wherein the reaction product has a second amount of neutralized acid groups greater than the first, and wherein the second amount is 70% or greater.
2 . The golf ball of claim 1 , wherein the thermoplastic resin component is a copolymer of ethylene and acrylic acid or methacrylic acid.
3 . The golf ball of claim 1 , wherein the second amount is 80% or greater.
4 . The golf ball of claim 1 , wherein the second amount is 90% or greater.
5 . The golf ball of claim 1 , further comprising a neutralizing agent selected from the group consisting of ammonium-based components, salts of ammonium-based components, amine-based components, salts of amine-based components, and mixtures thereof.
6 . A golf ball comprising:
a core,
a cover; and
an intermediate layer disposed between the core and the cover, wherein the intermediate layer comprises:
a thermoplastic resin component comprising acid groups; and
a neutralizing agent selected from the group consisting of an inner salt, a chelate, a surfactant, a phospholipid, an ionic liquid, a long-chain organic carbonate, a main-chain heteroatom-substituted fatty acid, and mixtures thereof,
wherein the acid groups are at least about 70% neutralized.
7 . The golf ball of claim 6 , wherein the acid groups are 100% neutralized.
8 . The golf ball of claim 6 , wherein the intermediate layer has a hardness of about 30 Shore D to about 70 Shore D.
9 . The golf ball of claim 6 , wherein the cover comprises a castable polyurethane, a polyurea, or a mixture thereof.
10 . The golf ball of claim 6 , wherein about 80% or greater of the acid groups are neutralized by the neutralizing agent.
11 . The golf ball of claim 10 , wherein about 90% or greater of the acid groups are neutralized by the neutralizing agent.
12 . The golf ball of claim 6 , wherein the thermoplastic resin component is a copolymer of ethylene and acrylic acid or methacrylic acid.
13 . A golf ball comprising at least one layer formed of a reaction product comprising:
a thermoplastic resin component comprising acid groups, wherein the thermoplastic resin component is a copolymer of ethylene and acrylic acid or methacrylic acid; and
a plasticizing agent selected from the group consisting of an inner salt, a chelate, a surfactant, a phospholipid, an ionic liquid, a long-chain organic carbonate, a main-chain heteroatom-substituted fatty acid, and mixtures thereof,
wherein the acid groups are at least 70% neutralized.
14 . The golf ball of claim 13 , wherein less than 70% of the acid groups are neutralized with a metal cation and the balance being neutralized by the plasticizing agent.
15 . The golf ball of claim 13 , wherein 30% or greater of the neutralized acid groups are neutralized by the plasticizing agent.
16 . The golf ball of claim 15 , wherein 50% or greater of the neutralized acid groups are neutralized by the plasticizing agent.
17 . The golf ball of claim 16 , wherein 80% or greater of the neutralized acid groups are neutralized by a neutralizing agent.