Golf ball having medium positive gradient quotient

US20170036069A1Inactive Publication Date: 2017-02-09ACUSHNET CO
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
Publication Date
2017-02-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

A golf ball includes a core and a cover. The core has an outer surface, a geometric center, and a soft transition region adjacent to the outer surface. The soft transition region has a thickness of 4 mm or less, includes about 10 to 30% trans-polybutadiene isomer, and has a positive hardness gradient of about 10 Shore C or less. The cover layer has a hardness of about 50 Shore M or greater. The core has a positive hardness gradient of about 10 to 42 Shore C. A secondary gradient quotient, GQ′, from about 2.2 to 9.5, GQ′ being defined by the equation:G′+T10×CORwhere G′ is the core positive hardness gradient in Shore C, T is the percent of trans-polybutadiene isomer at the core outer surface, and COR is the coefficient of restitution of the core measured at an incoming velocity of 125 ft / s.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is a continuation-in-part of co-pending U.S. patent application Ser. No. 14 / 943,277, filed Nov. 17, 2015, which is a continuation of U.S. patent application Ser. No. 13 / 945,707, filed Jul. 18, 2013 and now U.S. Pat. No. 9,186,556, which is a continuation-in-part of U.S. patent application Ser. No. 13 / 945,666, filed Jul. 18, 2013 and now U.S. Pat. No. 9,259,619, which is a continuation-in-part of U.S. patent application Ser. No. 13 / 549,446, filed Sep. 14, 2012 and now U.S. Pat. No. 8,672,777, which is a continuation of U.S. patent application Ser. No. 12 / 891,250, filed Sep. 27, 2010 and now U.S. Pat. No. 8,016,696, which is a continuation of U.S. patent application Ser. No. 12 / 056,361, filed Mar. 27, 2008 and now U.S. Pat. No. 7,744,490, which is a continuation-in-part of U.S. patent application Ser. No. 12 / 048,665, filed Mar. 14, 2008 and now U.S. Pat. No. 7,678,312, which is a continuation-in-part of U.S. patent applicat...

Examples

Embodiment Construction

[0027]The balls of the present invention may include a single-layer (one-piece) golf ball, and multi-layer golf balls, such as one having a core and a cover surrounding the core, but are preferably formed from a core comprised of a solid center (otherwise known as an inner core) and an outer core layer, an inner cover layer and an outer cover layer. Of course, any of the core and / or the cover layers may include more than one layer. In a preferred embodiment, the core is formed of an inner core and an outer core layer where both the inner core and the outer core layer have a “soft-to-hard” hardness gradient (a “negative” hardness gradient) radially inward from each component's outer surface towards its innermost portion (i.e., the center of the inner core or the inner surface of the outer core layer), although alternative embodiments involving varying direction and combination of hardness gradient amongst core components are also envisioned (e.g., a “negative” gradient in the center ...