Process for incorporating nanofiller masterbatch into a core of a golf ball

A golf ball comprising:

• a core formed from a reaction of core mixture comprising a first masterbatch ranging from 50 to 90 weight percent of the core mixture, a graphene masterbatch ranging 1 to 10 weight percent of the core mixture, barium sulfate ranging 1 to 5 weight percent of the core mixture, a peroxide ranging 0.2 to 1 weight percent of the core mixture, and zinc bis(pentachlorothiophenolate) ranging 0.2 to 1 weight percent of the core mixture;
• and
• a cover disposed over the core.