Golf ball resin composition and golf ball

Abstract

An object of the present invention is to provide a golf ball exhibiting an excellent shot feeling and resilience, and a constituent material thereof. The present invention provides a golf ball resin composition having a bending stiffness (M 3-12 ) ranging from 300 kgf/cm 2 to 24,000 kgf/cm 2 at a bending angle from 3° to 12°, a ratio (M 3-12 /M 24-30 ) of the bending stiffness (M 3-12 ) at the bending angle from 3° to 12° to a bending stiffness (M 24-30 ) at a bending angle from 24° to 30° ranging from 0.20 to 2.00, and a slab hardness ranging from 30 to 65 in Shore D hardness.

1 . A golf ball resin composition having a bending stiffness (M 3-12 ) ranging from 300 kgf/cm 2  to 24,000 kgf/cm 2  at a bending angle from 3° to 12°, a ratio (M 3-12 /M 24-30 ) of the bending stiffness (M 3-12 ) at the bending angle from 3° to 12° to a bending stiffness (M 24-30 ) at a bending angle from 24° to 30° ranging from 0.20 to 2.00, and a slab hardness ranging from 30 to 65 in Shore D hardness. 
     
     
         2 . The golf ball resin composition according to  claim 1 , wherein the golf ball resin composition has a ratio (M 12-15 /M 36-39 ) of a bending stiffness (M 12-15 ) at a bending angle from 12° to 15° to a bending stiffness (M 36-39 ) at a bending angle from 36° to 39° ranging from 0.20 to 2.00. 
     
     
         3 . The golf ball resin composition according to  claim 1 , wherein the golf ball resin composition comprises (A) a thermoplastic resin and (B) a filler. 
     
     
         4 . The golf ball resin composition according to  claim 3 , wherein (B) the filler is (b-1) a needle-like or fibrous filler, and (b-1) the needle-like or fibrous filler has an average diameter ranging from 0.02 μm to 0.3 μm in the transverse direction thereof, an average length ranging from 3 μm to 50 μm in the longitudinal direction thereof, and an average aspect ratio ranging from 10 to 2,500. 
     
     
         5 . The golf ball resin composition according to  claim 4 , wherein (b-1) the needle-like or fibrous filler is at least one material selected from the group consisting of wallastonite, potassium titanate, xonotlite, gypsum, aluminum borate, molybdenum disulfide, aramid, zinc oxide, crystalline cellulose, silica, alumina, carbon, glass, mica, and polyoxybenzoyl. 
     
     
         6 . The golf ball resin composition according to  claim 4 , wherein (b-1) the needle-like or fibrous filler forms an aggregate in the golf ball resin composition, and the aggregate has an average long diameter of 1 μm or more. 
     
     
         7 . The golf ball resin composition according to  claim 6 , wherein (A) the thermoplastic resin is present in a void between (b-1) the needle-like or fibrous fillers constituting the aggregate. 
     
     
         8 . The golf ball resin composition according to  claim 3 , wherein (B) the filler is (b-2) a surface organically treated metal filler, and (b-2) the surface organically treated metal filler is a metal filler obtained by treating the surface of at least one metal selected from the group consisting of aluminum, titanium, zinc, chromium, iron, nickel, tin, and copper, with a polymer composed of an α,β-unsaturated carboxylic acid and/or a derivate thereof. 
     
     
         9 . The golf ball resin composition according to  claim 8 , wherein (b-2) the surface organically treated metal filler has an average diameter ranging from 0.1 μm to 200 μm in the transverse direction thereof, an average length ranging from 0.5 μm to 300 μm in the longitudinal direction thereof, and an average aspect ratio ranging from 1.5 to 3,000. 
     
     
         10 . The golf ball resin composition according to  claim 8 , wherein (b-2) the surface organically treated metal filler has a polar functional group on the surface thereof, and the polar functional group is at least one selected from the group consisting of a carboxyl group, hydroxyl group, amino group, thiol group, sulfo group, and phosphonic acid group, and a content of the polar functional group ranges from 0.2 μg/g to 300 μg/g per unit mass of (b-2) the surface organically treated metal filler. 
     
     
         11 . The golf ball resin composition according to  claim 3 , wherein (A) the thermoplastic resin comprises a metal ion-neutralized product of a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, and/or a metal ion-neutralized product of a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and an α,β-unsaturated carboxylic acid ester,
 (B) the filler is (b-3) a carbonaceous filler, and 
 (b-3) the carbonaceous filler has a polar functional group on the surface thereof, and has an average short diameter ranging from 0.1 μm to 100 μm, an average long diameter ranging from 0.2 μm to 300 μm, an average aspect ratio ranging from 2.0 to 1,000, and an average thickness ranging from 0.3 nm to 50 nm. 
 
     
     
         12 . The golf ball resin composition according to  claim 11 , wherein (b-3) the carbonaceous filler is graphene and/or a graphite flake. 
     
     
         13 . The golf ball resin composition according to  claim 11 , wherein the polar functional group on the surface of (b-3) the carbonaceous filler is at least one selected from the group consisting of a carboxyl group, hydroxyl group, amino group, thiol group, sulfo group, and phosphonic acid group, and a content of the polar functional group ranges from 0.3 mmol/g to 5.0 mmol/g per unit mass of (b-3) the carbonaceous filler. 
     
     
         14 . The golf ball resin composition according to  claim 3 , wherein (A) the thermoplastic resin is a thermoplastic resin having a carboxyl group, and a content of an add component having the carboxyl group thereof ranges from 4 mass % to 50 mass %. 
     
     
         15 . The golf ball resin composition according to  claim 3 , wherein (A) the thermoplastic resin is an ionomer resin neutralized with at least one metal ion selected from the group consisting of Na + , Mg 2+ , Ca 2+ , and Zn 2+ . 
     
     
         16 . The golf ball resin composition according to  claim 3 , wherein the golf ball resin composition further contains (C) an amphoteric surfactant, and (C) the amphoteric surfactant is at least one selected from the group consisting of a betaine type amphoteric surfactant, sulfobetaine type amphoteric surfactant, phosphobetaine type amphoteric surfactant, β-alanine type amphoteric surfactant, glycine type amphoteric surfactant, alkylamine oxide type amphoteric surfactant, alkylamino fatty acid salt type amphoteric surfactant, and amidoamino acid type amphoteric surfactant. 
     
     
         17 . The golf ball resin composition according to  claim 3 , wherein the golf ball resin composition further contains (D) a fatty acid, and (D) the fatty acid is at least one selected from the group consisting of heptanoic acid, octanoic acid, dodecanoic acid, pentadecanoic acid, hexadecanoic acid, octadecanoic acid, icosanoic acid, docosanoic acid, octacosanoic acid, octadecenoic acid, octadecadienoic acid, icosenoic acid, oleic acid, linoleic acid, and arachidic acid. 
     
     
         18 . The golf ball resin composition according to  claim 3 , wherein the golf ball resin composition further contains (E) a metal compound. 
     
     
         19 . A golf ball comprising a constituent member formed from a golf ball resin composition, wherein the golf ball resin composition has a bending stiffness (M 3-12 ) ranging from 300 kgf/cm 2  to 24,000 kgf/cm 2  at a bending angle from 3° to 12°, a ratio (M 3-12 /M 24-30 ) of the bending stiffness (M 3-12 ) at the bending angle from 3° to 12° to a bending stiffness (M 24-30 ) at a bending angle from 24° to ° ranging from 0.20 to 2.00, and a slab hardness ranging from 30 to 65 in Shore D hardness. 
     
     
         20 . A golf ball comprising a core, at least one intermediate layer covering the core, and a cover covering the intermediate layer, wherein the at least one intermediate layer is formed from a golf ball resin composition having a bending stiffness (M 3-12 ) ranging from 300 kgf/cm 2  to 24,000 kgf/cm 2  at a bending angle from 3° to 12°, a ratio (M 3-12 /M 24-30 ) of the bending stiffness (M 3-12 ) at the bending angle from 3° to 12° to a bending stiffness (M 24-30 ) at a bending angle from 24° to 30° ranging from 0.20 to 2.00, and a slab hardness ranging from 30 to 65 in Shore D hardness.