Thermoplastic multi-layer golf ball
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United States of America Patent
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Sep 12, 2017
Grant Date -
Dec 4, 2014
app pub date -
Nov 12, 2013
filing date -
May 31, 2013
priority date (Note) -
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Abstract
A thermoplastic multi-layer golf ball has a core center including a first thermoplastic material, a core layer including a second thermoplastic material, and a cover including a third thermoplastic material. The core center has a diameter of 21-29 mm and a surface Shore D hardness H1 of less than about 50. The core layer is at least about 5 mm thick with an outer surface Shore D hardness H2 of more than about 50. The cover has an outer surface Shore D hardness H3 of more than about 60. H3 is up to about 20 Shore D units higher than H2, and H2 is up to about 10 Shore D units higher than H1. The core layer has a specific gravity that is at least 0.1 g/cm3 greater than the specific gravity of the core center.
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