Composition for improving the property of a golf ball cover

摘要

Disclosed is a golf ball cover property improving composition to be added to a thermoplastic polymer material such as a thermoplastic polyurethane material when a golf ball cover is formed from the thermoplastic polymer material, to thereby impart high restitution and excellent scuff resistance to the golf ball cover. The golf ball cover property improving composition contains an isocyanate mixture in which an isocyanate compound (X) having at least two isocyanate groups serving as functional groups in the molecule is dispersed in a thermoplastic resin (Y) which is substantially non-reactive with the isocyanate groups and which has a restitution elastic modulus of at least 45%.