Dual-Core Comprising Zero Gradient Center And Positive Gradient Outer Core Layer
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An outer core layer, geometric center technology, applied in the golf field, can solve the problem of time-consuming and so on
Inactive Publication Date: 2014-06-25
ACUSHNET CO
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A disadvantage of this manufacturing method is that it is a time consuming process to make the first elastomer, then the second and then mold them into one piece
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[0038] The term "carbon-carbon radical initiator" or "-C initiator" as used herein refers to the thermal decomposition of one or more extended carbon-carbon single bonds into free radicals by breaking and thus weakening them free radical initiators. These C-C initiators and their subgroups are also known, including compounds such as C-C unstable compounds, organic compounds with unstable or unstable C-C bonds, pure hydrocarbon initiators, aromatic hydrocarbons, Highly branched alkanes, sterically-crowded (sterically-crowded) phenyl substituted alkanes, dibenzyl or diphenyl curing catalysts, dicumyl compounds or synergists, alkyl substituted diphenyl compounds, Substituted succinates, diphenylethane derivatives, pinacols or pinacolones and their derivatives, silylbenzopinacols and their derivatives, non-peroxide radical initiators, free-radical A group donor or activator, a carbon-based donor, a carbon-based activator, a carbon-based accelerator, or a carbon-based product.
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Abstract
To achieve a single layer core that has a shallow hard-to-soft (positive) hardness gradient, from the surface to the center. A golf ball including an inner core having a geometric center and a first outer surface, the inner core being formed from a first substantially homogenous rubber composition, and an outer core layer formed from a second substantially homogenous rubber composition, the outer core layer having a second outer surface. An inner cover layer is formed over the core and includes an ionomeric material. An outer cover layer is formed over the inner cover layer and includes a castable polyurea or a castable polyurethane. The first outer surface has a hardness of up to about 20 Shore C less than a hardness at the geometric center to define a negative hardness gradient inner core and the second outer surface has a hardness of up to 18 Shore C greater than the geometric center hardness to define a positive gradient outer core layer and a shallow positive hardness gradient core.
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[0001] Cross References to Related Applications [0002] This application is a co-pending continuation-in-part of U.S. Patent Application Serial No. 13 / 421,924, filed March 16, 2012, and U.S. Patent Application Serial No. 12 / 976,197, filed December 22, 2012, presently Continuation-in-Part of U.S. Patent No. 8,137,214, filed December 28, 2009 U.S. Patent Application Serial No. 12 / 647,584, continuation-in-part of current U.S. Publication No. US2010-0099517, filed September 14, 2009 Continuation-in-Part of U.S. Patent Application Serial No. 12 / 558,826, current U.S. Patent No. 7,857,714, continuation-in-part of U.S. Patent Application Serial No. 12 / 186,877, filed August 6, 2008, current U.S. Patent No. 7,803,069 Application, U.S. Patent Application Serial No. 11 / 832,197, filed August 1, 2007, Continuation of current U.S. Patent No. 7,410,429, U.S. Patent Application Serial No. 11 / 829,461, filed July 27, 2007, current U.S. Continuation-in-Part of Patent No. 7,537,530, filed July 3,...
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