# US 10,870,039 B1 · Golf ball core

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,870,039 B1
- Document ID: US10870039B1
- Status: Granted
- Kind: B1
- Application number: 16/925,748
- Filed: 2020-07-10
- Granted: 2020-12-22
- Earliest claimed: 2018-03-27
- Assignees: Callaway Golf Company
- Applicants: Callaway Golf Company
- Inventors: Hong G. Jeon
- Web page: https://patentgrep.com/patent/US10870039B1

## CPC

- A63B 37/0051: {Materials other than polybutadienes; Constructional details}
- A63B 37/0031: {Hardness}
- A63B 37/0033: {Thickness}
- A63B 37/0044: {Hardness gradient}
- A63B 37/0045: {Thickness}
- A63B 37/0064: {Diameter}
- A63B 37/0074: {Two piece balls, i.e. cover and core}
- A63B 37/0076: {Multi-piece balls, i.e. having two or more intermediate layers}
- A63B 37/0091: {Density distribution amongst the different ball layers}
- A63B 45/00: Apparatus or methods for manufacturing balls (working of plastics or substances in a plastic state B29)
- B29C 43/003: {characterised by the choice of material}
- A63B 37/0046: {Deflection or compression}
- A63B 37/0061: {Coefficient of restitution}
- A63B 37/0065: {Deflection or compression}
- A63B 37/0075: {Three piece balls, i.e. cover, intermediate layer and core}
- A63B 37/0078: {Coefficient of restitution}
- B29K 2019/00: Use of rubber not provided for in a single one of main groups {B29K2007/00 - B29K2011/00,} as moulding material
- B29K 2075/00: Use of {PU, i.e.} polyureas or polyurethanes {or derivatives thereof}, as moulding material
- B29K 2507/04: Carbon
- B29L 2031/546: {Golf balls}
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

A golf ball with a center core comprising 1,4 polybutadiene with a cis content more than 50% and containing a metal salt of acrylate, wherein the 1,4 polybutadiene has 5 to 60 weight percent of a metal salt of acrylate, is disclosed herein. The metal salt of acrylate is preferably selected from zinc, magnesium, sodium, and calcium.

## Claims

### Claim 1

A golf ball comprising:
a center core formed from a mixture comprising 1,4 polybutadiene with a cis content more than 50% and containing a metal salt of acrylate, wherein the 1,4 polybutadiene has 5 to 60 weight percent of a metal salt of acrylate chemically attached to a main chain of the 1,4 polybutadiene, 0.4 to 2.5 weight percent graphene material, 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; and
a cover layer disposed over the center core.

### Claim 2 (depends on 1)

The golf ball according to claim 1 wherein metal salt of acrylate are zinc, magnesium, sodium, and calcium.

### Claim 3 (depends on 1)

The golf ball according to claim 1 wherein the cover has a thickness ranging from 0.025 inch to 0.045 inch.

### Claim 4 (depends on 1)

The golf ball according to claim 1 further comprising:
an outer core disposed over the center core;
an inner mantle layer disposed over the outer core, the inner mantle layer having a thickness ranging from 0.025 inch to 0.040 inch, the inner mantle layer composed of an ionomer material, the inner mantle layer material having a plaque Shore D hardness ranging from 65 to 71;
an outer mantle layer disposed over the inner mantle layer, the outer mantle layer having a thickness ranging from 0.070 inch to 0.090 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 center core.

### Claim 5 (depends on 1)

The golf ball according to claim 1 further comprising:
an outer core disposed over the center core;
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 center core.

### Claim 6

A method for forming a core for a golf ball, the method comprising:
mixing a core material comprising 1,4 polybutadiene with a cis content more than 50% and a metal salt of acrylate, wherein the 1,4 polybutadiene has 5 to 60 weight percent of metal salt of acrylate chemically attached to a main chain of the 1,4 polybutadiene; and
compression molding a core from the core material;
wherein the core material comprises 0.4 to 2.5 weight percent graphene material further, 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.

### Claim 7 (depends on 6)

The method according to claim 6 wherein the core has a diameter ranging from 0.70 inch to 1.6 inch.

### Claim 8 (depends on 6)

The method according to claim 6 further comprising forming a cover over the core.

### Claim 9 (depends on 6)

The method according to claim 6 further comprising forming a mantle layer over the core.

### Claim 10 (depends on 9)

The method according to claim 9 wherein the cover is formed of a TPU.

### Claim 11

A golf ball comprising:
an inner core formed from a mixture comprising 1,4 polybutadiene with a cis content more than 50% and containing a metal salt of acrylate, wherein the 1,4 polybutadiene has 5 to 60 weight percent of a metal salt of acrylate chemically attached to a main chain of the 1,4 polybutadiene, 0.4 to 2.5 weight percent graphene material, 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;
an outer core comprising 1,4 polybutadiene with a cis content more than 50% and containing a metal salt of acrylate, wherein the 1,4 polybutadiene has 5 to 60 weight percent of metal salt of acrylate;
a mantle layer;
a cover.