Golf ball cores having foam center and thermoset outer layers with hardness gradients
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United States of America Patent
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Nov 13, 2018
Grant Date -
Feb 1, 2018
app pub date -
Sep 25, 2017
filing date -
Apr 11, 2013
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Abstract
Multi-layered golf ball core sub-assemblies and the resulting golf balls are provided. The core structure includes an inner core (center) comprising a foam composition, preferably foamed polyurethane. The intermediate and outer core layers are preferably formed from foamed and non-foamed thermoset compositions. For example, the intermediate core can be formed from a thermoset rubber so there are adjoining foam core layers (inner and intermediate) and the outer core layer can be formed from a non-foamed thermoset rubber. The core layers have different hardness and specific gravity levels. The core assembly preferably has a positive hardness gradient extending across the entire assembly. The core structure and resulting ball have relatively good resiliency.
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