Thermoplastic dual core having positive hardness gradient inner and outer core layers
US9873026B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2015 |
| Grant date | Jan 23, 2018 |
| Priority date | — |
| Expiry date | Dec 22, 2035 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B37/0043
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A golf ball includes an inner core layer including a thermoplastic highly-neutralized ionomer formed from a copolymer of ethylene and an α,β-unsaturated carboxylic acid, an organic acid or salt thereof, and sufficient cation source to neutralize the acid groups of the copolymer by 80% or greater. The inner core has a geometric center hardness and a surface hardness to define a first positive hardness gradient having a first slope, S1. An outer core layer is disposed about the inner core and is formed from a second thermoplastic highly-neutralized ionomer. The outer core layer has an interior hardness and an outer surface hardness greater than the interior hardness to define a second positive hardness gradient having a second slope, S2. The golf ball also includes a cover layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.