▎ 摘　　要

NOVELTY - Golf ball (B1) (10) comprises an inner core (12a) comprising a polybutadiene material, an outer core (12b) comprising polybutadiene material and a graphene material (19), and a cover layer (16) disposed over the outer core, where the cover layer comprises 5-45 wt.% of a highly neutralized polymer, 5-45 wt.% of a first ionomer, 5-45 wt.% of a second ionomer, 5-45 wt.% of a third ionomer, 5-30 wt.% of a masterbatch comprising 15-40 wt.% of an impact modifier, and 1-10 wt.% of a color masterbatch, where the golf ball has a diameter of at least 1.68 inches, a mass of lower than 45.93 g, and a coefficient of restitution of at least 0.79. USE - Used as a golf ball. ADVANTAGE - The golf ball utilizes: the graphene material that has a surface area of 400-800 m2/g, 15-50 m2/g or 300-400 m2/g; the cover layer that has a Shore D hardness of 35-60; and the outer core that has a tensile modulus of 8-10 MPa (claimed). DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) golf ball (B2) comprising inner core comprising polybutadiene and graphene material, outer core comprising polybutadiene and graphene material, and cover layer disposed over the outer core; and (2) golf ball (B3) comprising inner core comprising polybutadiene and graphene material, outer core comprising polybutadiene and graphene material, mantle layer, and cover layer disposed over the outer core. DESCRIPTION OF DRAWING(S) - The figure shows partial cut-away view of a golf ball. Golf ball (10) Inner core (12a) Outer core (12b) Cover layer (16) Graphene material (19)