Dual core golf ball having negative-hardness-gradient thermoplastic inner core and steep positive-hardness-gradient thermoset outer core layer

US8007376B2 · kind B2 · utility

Assignee

• Acushnet Company · US

Inventors

• Michael J. Sullivan · Old Lyme, US
• Brian Comeau · Berkley, US
• William B. Lacy · Plymouth, US

Key dates

• Filing date: Sep 27, 2010
• Grant date: Aug 30, 2011
• Expiry date: Sep 27, 2030

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A63B37/02
• WIPO field: Furniture, games
• WIPO sector: Other fields

Abstract

A golf ball comprising a thermoplastic inner core layer that has a geometric center hardness greater than its surface hardness to define a “negative” hardness gradient. An outer core layer is disposed about the inner core and is formed from a substantially homogenous thermoset composition, typically rubber, and has an inner surface hardness substantially less than its outer surface hardness to define a “positive” hardness gradient. An inner cover layer is disposed about the outer core layer and an outer cover layer is disposed about the inner cover layer.