# US 10,245,471 B2 · Multi-layer golf ball

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- Number: US 10,245,471 B2
- Document ID: US10245471B2
- Status: Granted
- Kind: B2
- Application number: 15/626,225
- Filed: 2017-06-19
- Published: 2017-10-05
- Granted: 2019-04-02
- Earliest claimed: 2001-11-28
- Assignees: Acushnet Company
- Applicants: Acushnet Company
- Inventors: Michael J. Sullivan
- Web page: https://patentgrep.com/patent/US10245471B2

## CPC

- A63B 37/00922: {whereby hardness of the cover is lower than hardness of the intermediate layers}
- A63B 37/0003: {Golf balls}
- A63B 37/0027: {Polyurea}
- A63B 37/0031: {Hardness}
- A63B 37/0039: {characterised by the material}
- A63B 37/0043: {Hardness}
- A63B 37/0045: {Thickness}
- A63B 37/00621: {Centre hardness}
- A63B 37/00622: {Surface hardness}
- A63B 37/0063: {Hardness gradient}
- A63B 37/0064: {Diameter}
- A63B 37/0066: {Density; Specific gravity}
- A63B 37/0076: {Multi-piece balls, i.e. having two or more intermediate layers}
- A63B 37/008: {Diameter}
- A63B 37/0087: {Deflection or compression}
- A63B 37/0059: {Ionomer}
- A63B 37/0078: {Coefficient of restitution}
- C08K 5/20: Carboxylic acid amides
- 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)

## Abstract

Multi-piece golf balls having a multi-layered solid core and multi-layered cover are provided.

## Claims

### Claim 1

A golf ball consisting essentially of:
an inner core layer formed from a thermoset composition and having a diameter of 1.2 inches or greater, a center hardness (Hcenter) of from 45 Shore C to 80 Shore C, and an outer surface hardness (Hcenter surface) of from 55 Shore C to 90 Shore C;
an intermediate core layer formed from a thermoplastic composition having a material hardness (Hintermediate core material) of 98 Shore C or less;
an outer core layer formed from an ionomer composition having a material hardness (Houter core material) of 35 Shore D or greater;
an inner cover layer formed from a thermoplastic composition having a material hardness (Hinner cover material) of 95 Shore C or less;
an intermediate cover layer formed from a thermoplastic composition having a material hardness (Hintermediate cover material) of 80 Shore C or greater;
and an outer cover layer formed from a composition selected from the group consisting of polyurethanes, polyureas, and copolymers and blends thereof, and having an outer surface hardness (Houter cover surface) of from 58 Shore D to 75 Shore D;
wherein Hintermediate cover material is greater than Houter core material.

### Claim 2 (depends on 1)

The golf ball of claim 1, wherein the intermediate core layer has a thickness of from 0.015 inches to 0.070 inches.

### Claim 3 (depends on 1)

The golf ball of claim 1, wherein Hintermediate core material is 96 Shore C or less.

### Claim 4 (depends on 1)

The golf ball of claim 1, wherein the intermediate core layer has a surface hardness (Hintermediate core surface) and the outer core layer has a surface hardness (Houter core surface), and Hintermediate core surface is greater than Houter core surface.

### Claim 5 (depends on 1)

The golf ball of claim 1, wherein the intermediate core layer has a surface hardness of from 87 Shore C to 95 Shore C.