Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Reexamination Certificate
2008-06-24
2008-06-24
Kopec, Mark (Department: 1796)
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
C106S419000, C106S425000, C106S429000, C106S432000, C106S442000, C106S443000, C106S447000, C106S450000, C106S471000, C252S500000, C424S059000, C428S403000, C428S447000, C516S033000
Reexamination Certificate
active
07390355
ABSTRACT:
A dispersion containing zinc oxide particles having a dispersion particle size of (i) median volume particle diameter in the range from 70 to 130 nm, (ii) less than 16% by volume of particles having a volume diameter of less than 35 nm below the median volume particle diameter, and (iii) more than 84% by volume of particles having a volume diameter of less than 57 nm above the median volume particle diameter. The zinc oxide dispersion can be used in a sunscreen product that exhibits both effective UV protection and improved transparency. The zinc oxide is particularly suitable for use in combination with transparent titanium dioxide.
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Abstract of Guo-Dong Li et al., “Study on preparation of low cost, non-aggregation ZnO nanoparticles”.
Croda International PLC
Jones Day
Kopec Mark
Nguyen Khanh T
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