prov:value
| - Moreover, the cover compositions may also contain softening agents such as those disclosed in U.S. Pat. Nos. 5,312,857 and 5,306,760, including plasticizers, metal stearates, processing acids, and the like, and reinforcing materials such as glass fibers and inorganic fillers, as long as the desired properties produced by the golfball covers are not impaired.
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