Process for incorporating graphene into a core of golf ball

1. A method for forming a golf ball with a graphene core, the method comprising:

mixing a graphene masterbatch material with a polybutadiene material, zinc diacrylate, zinc oxide, and a peroxide initiator to form a core mixture, wherein the graphene masterbatch material comprises graphene in an amount from 0.1 to 80.0 weight percent of the graphene masterbatch material mixed with a carrier polymer in an amount from 99.9 to 20 weight percent of the graphene masterbatch material; and

compression molding a core from the core mixture, wherein the core mixture comprises 40-90 weight percent of polybutadiene, 0.4 to 2.5 weight percent graphene material, 1-30 weight percent polyisoprene, 10-50 weight percent zinc diacrylate, 1-30 weight percent zinc oxide, 1-20 weight percent zinc stearate, and 0.1-10 weight percent peroxide initiator.

2. The method according to claim 1 wherein the core has a diameter ranging from 0.70 inch to 1.6 inch.

3. The method according to claim 1 further comprising forming a cover over the core.

4. The method according to claim 1 further comprising forming a mantle layer over the core.

5. The method according to claim 1 wherein compression molding a core from the core mixture comprises compression molding a center core.

6. The method according to claim 1 wherein compression molding a core from the core mixture comprises compression molding an outer core layer over a center core comprising a polybutadiene mixture.

7. The method according to claim 1 wherein compression molding a core from the core mixture comprises compression molding a center core and an outer core over the center core, and the center core and the outer core comprise the core mixture.