# US 10,500,446 B1 · Process for incorporating graphene into a core of a golf ball

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- Number: US 10,500,446 B1
- Document ID: US10500446B1
- Status: Granted
- Kind: B1
- Application number: 16/403,203
- Filed: 2019-05-03
- Granted: 2019-12-10
- Earliest claimed: 2016-09-28
- Assignees: Callaway Golf Company
- Applicants: Callaway Golf Company
- Inventors: Vijay Chavan; David Bartels
- Web page: https://patentgrep.com/patent/US10500446B1

## CPC

- A63B 37/0051: {Materials other than polybutadienes; Constructional details}
- A63B 37/0031: {Hardness}
- A63B 37/0043: {Hardness}
- A63B 37/0045: {Thickness}
- A63B 37/0054: {Substantially rigid, e.g. metal}
- A63B 37/0062: {Hardness}
- A63B 37/0064: {Diameter}
- A63B 37/0074: {Two piece balls, i.e. cover and core}
- A63B 37/0075: {Three piece balls, i.e. cover, intermediate layer and core}
- A63B 37/0076: {Multi-piece balls, i.e. having two or more intermediate layers}
- A63B 37/0092: {Hardness distribution amongst different ball layers}
- A63B 45/00: Apparatus or methods for manufacturing balls (working of plastics or substances in a plastic state B29)
- C08K 3/041: {Carbon nanotubes}
- C08K 3/042: {Graphene or derivatives, e.g. graphene oxides}
- C08K 3/22: of metals
- C08K 5/098: Metal salts of carboxylic acids
- C08K 5/14: Peroxides
- C08L 9/00: Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08K 2003/2296: {of zinc}
- C08K 2201/006: Additives being defined by their surface area
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A method for forming a golf ball with a graphene core disclosed herein. The method includes mixing a graphene masterbatch material with a polybutadiene material to form a core mixture, 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.

## Claims

### Claim 1

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; and
a cover layer disposed over the outer core;
wherein a dual core comprising the inner core and the outer core has a compression value ranging from 40 to 55.

### Claim 2 (depends on 1)

The golf ball according to claim 1 wherein the carrier polymer material is selected from the group consisting of polybutadiene, polyisoprene, polyisobutylene, EPDM, polyethylene ionomer, maleic anhydride functionalized polyethylene, styrene butadiene rubber, styrene isoprene rubber, and butyl rubber.

### Claim 3 (depends on 1)

The golf ball according to claim 1 wherein the carrier polymer material is polybutadiene.

### Claim 4 (depends on 1)

The golf ball according to claim 1 further comprising:
an inner mantle layer disposed over the outer core, the inner mantle layer having a thickness ranging from 0.03 inch to 0.09 inch, the inner mantle layer composed of an ionomer material, the inner mantle layer material having a plaque Shore D hardness ranging from 34 to 55;
an outer mantle layer disposed over the inner mantle layer, the outer mantle layer having a thickness ranging from 0.025 inch to 0.050 inch;
and
wherein the cover layer is disposed over the outer mantle layer, the cover layer has a thickness ranging from 0.025 inch to 0.040 inch;
wherein the cover layer has a lower Shore D hardness than the outer mantle layer, the outer mantle layer has a higher Shore D hardness than the inner mantle layer, the outer core has a higher Shore D hardness than the inner mantle layer and the inner core.

### Claim 5 (depends on 1)

The golf ball according to claim 1 further comprising:
an inner mantle layer disposed over the outer core, the inner mantle layer having a thickness ranging from 0.030 inch to 0.090 inch, the inner mantle layer material having a plaque Shore D hardness ranging from 30 to 50;
an outer mantle layer disposed over the inner mantle layer, the outer mantle layer having a thickness ranging from 0.025 inch to 0.070 inch, the outer mantle layer material having a plaque Shore D hardness ranging from 50 to 71, wherein the inner mantle is thicker than the outer mantle, and the outer mantle is harder than the inner mantle; and
wherein the cover layer is disposed over the outer mantle layer, the cover layer having a thickness ranging from 0.025 inch to 0.050 inch, wherein the cover layer has a Shore D hardness less than the hardness of the outer mantle layer, the outer mantle layer has a higher Shore D hardness than the inner mantle layer, the outer core has a higher Shore D hardness than the inner mantle layer and the inner core.

### Claim 6 (depends on 1)

The golf ball according to claim 1 further comprising:
an inner mantle layer disposed over the outer core, the inner mantle layer having a thickness ranging from 0.070 inch to 0.090 inch, the inner mantle layer composed of an ionomer material, the inner mantle layer material having a plaque Shore D hardness ranging from 36 to 44;
an outer mantle layer disposed over the inner mantle layer, the outer mantle layer having a thickness ranging from 0.025 inch to 0.040 inch, the outer mantle layer composed of an ionomer material, the outer mantle layer material having a plaque Shore D hardness ranging from 65 to 71; and
wherein the cover layer is disposed over the outer mantle layer, the cover layer having a thickness ranging from 0.025 inch to 0.040 inch;
wherein the cover layer has a lower Shore D hardness than the outer mantle layer, the outer mantle layer has a higher Shore D hardness than the inner mantle layer, the outer core has a higher Shore D hardness than the inner mantle layer and the inner core.

### Claim 7 (depends on 1)

The golf ball according to claim 1 wherein the graphene material has a surface area ranging from 400 m2/g to 800 m2/g.

### Claim 8 (depends on 1)

The golf ball according to claim 1 further comprising:
an inner mantle layer disposed over the outer core, the inner mantle layer having a thickness ranging from 0.030 inch to 0.050 inch, the inner mantle layer material having a plaque Shore D hardness ranging from 30 to 40, the inner mantle layer composed of an ionomer material;
a first center mantle layer disposed over the inner mantle layer, the first center mantle layer having a thickness ranging from 0.030 inch to 0.050 inch, the first center mantle layer material having a plaque Shore D hardness ranging from 40 to 55, the first center mantle layer composed of a fully neutralized polymer material;
a second center mantle layer disposed over the second center mantle layer, the second center mantle layer having a thickness ranging from 0.030 inch to 0.050 inch, the second center mantle layer material having a plaque Shore D hardness ranging from 45 to 55, the second center mantle layer composed of a fully neutralized polymer material;
an outer mantle layer disposed over the second center mantle layer, the outer mantle layer having a thickness ranging from 0.030 inch to 0.050 inch, the outer mantle layer composed of a blend of ionomers, the outer mantle layer material having a plaque Shore D hardness ranging from 60 to 75; and
wherein the cover layer is disposed over the outer mantle layer, the cover layer having a thickness ranging from 0.025 inch to 0.040 inch.

### Claim 9 (depends on 1)

The golf ball according to claim 1 wherein the outer core has a tensile modulus ranging from 8 MPa to 10 MPa.

### Claim 10 (depends on 1)

The golf ball according to claim 1 wherein the graphene material has a surface area ranging from 15 m2/g to 50 m2/g.

### Claim 11 (depends on 1)

The golf ball according to claim 1 wherein the graphene material has a surface area ranging from 300 m2/g to 400 m2/g.

### Claim 12

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.