Process for incorporating graphene into a core of a golf ball

A golf ball comprising:

• an inner core comprising a polybutadiene material;
• an outer core comprising polybutadiene material and a graphene masterbatch in an amount ranging from 0.1 to 5.0 weight percent of the outer core, wherein the polybutadiene material comprises 40-90 weight percent of polybutadiene, 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, 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 outer core has a flexural modulus ranging from 80 MPa to 95 MPa;
• a mantle layer disposed over the outer core;
• and
• a cover layer disposed over the mantle layer;
• wherein a dual core comprising the inner core and the outer core has a compression value ranging from 40 to 55.