Process for incorporating graphene into a core of a golf ball

A golf ball comprising:

• a core comprising polybutadiene material and a graphene masterbatch in an amount ranging from 0.1 to 5.0 weight percent of the core, 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, wherein the graphene material has a surface area ranging from 150 m2/g to 1000 m2/g;
• an inner mantle layer disposed over the core, the inner mantle having a Shore D hardness ranging from 35 to 77 and a thickness ranging from 0.025 inch to 0.050 inch;
• an outer mantle layer disposed over the inner mantle layer, the outer mantle layer composed of a blend of ionomers, having a Shore D hardness ranging from 55-75, and having a thickness ranging from 0.025 inch to 0.040 inch;
• and
• a cover layer disposed over the outer mantle layer;
• wherein the carrier polymer material is selected from the group consisting of polyisoprene, polyisobutylene, EPDM, polyethylene ionomer, maleic anhydride functionalized polyethylene, styrene butadiene rubber, styrene isoprene rubber, and butyl rubber.