초록 ▼

A game ball having a cover formed from a crosslinkable thermoplastic polyurethane is disclosed. Various types of game balls are described including golf balls and softballs. By selective exposure to radiation, the thermoplastic polyurethane cover is crosslinked and its hardness is increased. Typical

A game ball having a cover formed from a crosslinkable thermoplastic polyurethane is disclosed. Various types of game balls are described including golf balls and softballs. By selective exposure to radiation, the thermoplastic polyurethane cover is crosslinked and its hardness is increased. Typically, increases in hardness values of at least 2 units on the Shore D scale are realized upon exposure to 3.5 Mrads of gamma radiation.

대표청구항 ▼

1. A game ball selected from the group of a golf ball, a basketball, a baseball, a softball, a football, a soccer ball, a volleyball, a tennis ball and a lacrosse ball, comprising:a central portion, and a first cover layer formed over said central portion, said first cover layer comprising a crossli

1. A game ball selected from the group of a golf ball, a basketball, a baseball, a softball, a football, a soccer ball, a volleyball, a tennis ball and a lacrosse ball, comprising:a central portion, and a first cover layer formed over said central portion, said first cover layer comprising a crosslinkable thermoplastic polyurethane, and wherein said first cover layer further comprises an unsaturated co-agent capable of crosslinking said crosslinkable thermoplastic polyurethane via free radical initiation.