Dual core golf ball having negative-hardness-gradient thermoplastic inner core and steep positive-hardness-gradient thermoset outer core layer
US8915801B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2011 |
| Grant date | Dec 23, 2014 |
| Priority date | — |
| Expiry date | May 3, 2033 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B37/02
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A golf ball includes an inner core layer formed from a thermoplastic material comprising a highly-neutralized ionomer comprising a copolymer of ethylene and an α,β-unsaturated carboxylic acid, an organic acid or salt thereof, and sufficient cation source to fully-neutralize the acid groups of the copolymer by 80% or greater. The inner core has a geometric center hardness less than its surface hardness to define a positive hardness gradient. An outer core layer is formed over the inner core and is formed from a substantially homogenous thermoset composition. The outer core layer has an interior hardness substantially less than an outer surface hardness to define a steep positive hardness gradient. An inner cover layer and an outer cover layer are formed over the outer core layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.