Patent ID: 8106134

Claim:
A method of modifying a golf ball comprising a core and a cover of a polymer layer, the method comprising the step of impregnating the cover layer with an olefin compound having a group selected from among an isocyanate group, an isothiocyanate group, an isocyanate group-blocked portion formed with isocyanate group under the application of heat, and an isothiocyanate group blocked portion formed with isothiocyanate group under the application of heat; wherein the step of impregnating the cover layer is carried out at an impregnation temperature that does not exceed the melting point and/or softening point of the polymer material in the cover layer, and for an impregnation time in a range of from about 15 seconds to about 100 hours; and following the step of impregnating the cover layer, surplus isocyanate and/or isothiocyanate-containing olefin compound adhering to the cover layer of the golf ball is either wiped off or blown off with an air knife.