Cover composition for golf ball
View Patent ↗A cover composition for a golf ball includes: an isocyanate group-terminated urethane prepolymer containing an isocyanate component derived from at least one diisocyanate selected from the group consisting of 4,4′-dicyclohexylmethane diisocyanate, isophorone diisocyanate, and cyclohexane diisocyanate; an aromatic polyamine; a light stabilizer; and a titanium oxide applied with a surface treatment capable of suppressing photocatalytic action of the titanium oxide, wherein the cover composition contains 3 to 8 parts by mass of the surface-treated titanium oxide relative to 100 parts by mass of the urethane prepolymer. The golf ball having the cover composition has superior resistance against discoloration or degradation with time, namely, superior weatherability.
1. A cover composition for a golf ball comprising:
an isocyanate group-terminated urethane prepolymer containing an isocyanate component derived from at least one diisocyanate compound selected from the group consisting of 4,4′-dicyclohexylmethane diisocyanate, isophorone diisocyanate, and cyclohexane diisocyanate;
an aromatic polyamine;
a light stabilizer; and
a titanium oxide applied with a surface treatment capable of suppressing photocatalytic action of the titanium oxide, wherein said cover composition contains 3 to 8 parts by mass of said surface-treated titanium oxide relative to 100 parts by mass of said isocyanate group-terminated urethane prepolymer.
2. The cover composition according to claim 1 , wherein said cover composition contains polyether polyol.
3. The cover composition according to claim 1 , wherein said surface-treated titanium oxide is formed on a particle surface with at least one selected from the group consisting of silicon oxide, zirconium oxide, aluminum oxide, and hydrates thereof.
4. The cover composition according to claim 1 , wherein said light stabilizer is a tertiary hindered amine light stabilizer.
5. The cover composition according to claim 2 , wherein said surface-treated titanium oxide is formed on a particle surface with at least one selected from the group consisting of silicon oxide, zirconium oxide, aluminum oxide, and hydrates thereof.
6. The cover composition according to claim 2 , wherein said light stabilizer is a tertiary hindered amine light stabilizer.
7. The cover composition according to claim 3 , wherein said light stabilizer is a tertiary hindered amine light stabilizer.
8. The cover composition according to claim 5 , wherein said light stabilizer is a tertiary hindered amine light stabilizer.
9. A golf ball having a cover layer made of the cover composition of claim 1 .