| http://www.w3.org/ns/prov#value | - In one embodiment, the invention is a golf ball including a cover layer, a central core and optionally one or more intermediate layers, where the cover layer includes the reaction product of one or more polyisocyanates; a reagent which is a polyol, or a polyamine or a combination of the two, and a chain extender or curing agent including one or more dicyandiamides having the general formula:
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