Golf ball and method of making same
Method of making a golf ball, the golf ball comprising a core, an outer layer and at least one adhesion promoting coating disposed between each of the core and the outer layer; the core comprising a rubber composition comprising at least one zinc-containing and/or magnesium-containing component; the outer layer comprising at least one ionomer; and the adhesion promoting coating comprising a waterborne dispersion comprised of at least one ethylene acid copolymer having an acid content of at least 15% by weight wherein the copolymer is at least partially neutralized with one or more neutralizing agent; wherein at least one neutralizing agent is selected from ammonia compounds and/or amine compounds. In a specific embodiment, the at least one neutralizing agent comprises i) mono and/or divalent metal compounds and ii) ammonia compounds and/or amine compounds.
1. A method of making a golf ball comprising the steps of:
providing a core formed from a rubber composition comprising at least one zinc-containing and/or magnesium-containing component;
applying an adhesion promoting coating about an outer surface of the core, wherein the adhesion promoting coating is a waterborne dispersion comprising at least one ethylene acid copolymer having an acid content of at least 15% by weight, wherein the ethylene acid copolymer is at least partially neutralized with dicyclohexylamine and/or aminomethylpropanol; and
forming an outer layer about an outer surface of the adhesion promoting coating, the outer layer comprising at least one ionomer.
2. The method of claim 1 , wherein the adhesion promoting coating contains about 15 wt % to about 30 wt % solids.
3. The method of claim 1 , wherein the total amount of neutralizing agent included in the adhesion promoting coating is from about 1.50 pbw to about 5.50 pbw.
4. The method of claim 1 , wherein from 10% to 40% of the acid groups of the acid copolymer are neutralized.
5. A method of making a golf ball comprising the steps of:
providing a core formed from a rubber composition comprising at least one zinc-containing and/or magnesium-containing component;
applying an adhesion promoting coating about an outer surface of the core, wherein the adhesion promoting coating is a waterborne dispersion comprising at least one ethylene acid copolymer having an acid content of at least 15% by weight, wherein the ethylene acid copolymer is at least partially neutralized with a first neutralizing agent selected from ammonia compounds and amine compounds and a second neutralizing agent selected from monovalent metal compounds and divalent metal compounds of zinc, calcium, magnesium, copper, manganese, nickel, cobalt, sodium, potassium, lithium, and combinations of two or more thereof; and
forming an outer layer about an outer surface of the adhesion promoting coating, the outer layer comprising at least one ionomer.
6. The method of claim 5 , wherein the adhesion promoting coating contains about 15 wt % to about 30 wt % solids.
7. The method of claim 5 , wherein the total amount of neutralizing agent included in the adhesion promoting coating is from about 1.50 pbw to about 5.50 pbw.
8. The method of claim 5 , wherein from 10% to 40% of the acid groups of the acid copolymer are neutralized.