ABSTRACT
The use of Surlyn ionomers in golf ball covers is well documented and deal exclusively with neutralized copolymers of ethylene and methacrylic acid typically containing 15 wt-% or less methacrylic acid. In 1971, R.P.Molitor at Spalding discovered that blends of zinc and sodium ionomers gave enhanced distance and improved low temperature durability over previous covers. It has now been demonstrated using materials developed in our laboratories that ionomers containing about 20 wt-% acid neutralized with a variety of different cations, give golf balls having dramatically lower spin rates and greatly improved distance.
