GOLF BALLS INCORPORATING CERIUM OXIDE NANOPARTICLES
The invention is directed to a golf ball providing improved UV resistance, abrasion resistance and hydrophobicity comprising cerium oxide nanoparticles having a particle size within the wavelength of visible light. The golf ball of the invention may comprise the cerium oxide nanoparticles in any or all of outer core layers, intermediate layers, inner cover layers, outer cover layers and even as a coating composition in an amount of from about 0.5 wt % to about 10 wt % of the respective layer. The cerium oxide nanoparticles may be randomly dispersed within a layer or coating, or alternatively, the cerium oxide nanoparticles may be ordered in an array within the layer or coating.
1 . A method of making a golf ball comprising: providing a core; forming a cover comprising a thermoset or thermoplastic composition having an aromatic component by combining a prepolymer with a curing agent and a white pigment and then randomly dispersing from about 0.5 wt % to about 10 wt % of a composition for resisting UV degradation consisting of cerium oxide nanoparticles having a particle size of from about 370 nm to about 800 min into the cover composition, thereby forming a whiteness preserving cover that retains a white appearance when exposed to UV light; and molding the whiteness preserving cover about the core.
2 . (canceled)
3 . The method of claim 1 , wherein the particle size is from about 400 nm to about 700 nm.
4 . The method of claim 1 , wherein particle size is from about 380 nm to about 500 nm.
5 . The method of claim 1 , wherein particle size is from about 500 nm to about 700 nm.
6 . (canceled)
7 . The method of claim 1 , wherein the core comprises the cerium oxide nanoparticles in an amount of from about 1.0wt % to about 4.0wt %.
8 . The method of claim 1 , wherein the overall golf ball has a compression of from about 25 to about 110.
9 . The method of claim 1 , wherein the overall golf ball is at least about 0.780.
10 . (canceled)
11 . (canceled)
12 . (canceled)
13 . (canceled)
14 . (canceled)
15 . The method of claim 1 , wherein the cover has a ΔYI from day 5 to day 8 of about 1.73 or less; and wherein the cover has a Δb* from day 5 to day 8 of about 0.99 or less.
16 . The method of manufacturing a golf ball of claim 1 , wherein the cover has a ΔYI from day 5 to day 8 of about 1.7; and wherein the cover has a Δb* from day 5 to day 8 of about 0.97.
17 . The method of manufacturing a golf ball of claim 1 , wherein the cover has a ΔYI from day 5 to day 8 of about 1.2; and wherein the cover has a Δb* from day 5 to day 8 of about 0.53.
18 . A method of making a golf ball comprising: providing a core; forming a cover comprising a thermoset or thermoplastic composition having an aromatic component by combining a prepolymer with a curing agent and a white pigment and then randomly dispersing from about 0.5 wt % to about 10 wt % of a composition for resisting UV degradation consisting of cerium oxide nanoparticles having a particle size of from about 370 nm to about 800 nmin into the cover composition, thereby forming a whiteness preserving cover that retains a white appearance when exposed to UV light; and forming the whiteness preserving cover about the core, wherein the cover has a ΔYI from day 5 to day 8 of about 2.1 or less; and wherein the cover has a Δb* from day 5 to day 8 of about 1.2 or less.