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Document Number
US Patent 7390355
Issued Date
June 24, 2008
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Inventors
Lyth; Philip Laurence (Stockton-on-Tees,GB)
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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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Number of Claims:
22
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Owner
Croda International Plc (Goole, East Yorkshire,GB)
Published
June 24, 2008
Application Number
10/559,276
Filed
June 10, 2004
US Classification
106/401   106/419 106/425 106/429 106/432 106/442 106/443 106/447 106/450 106/471 252/500 424/59 428/403 428/447 516/33
Int'l Classification
C04B   14/00   (20060101)  
Examiner
Assistant Examiner
Attorney/Law Firm
Priority Data
Jun 11, 2003 [GB] 0313432.7
USPTO Field of Search
252/500   242/59   106/401   106/419   106/425   106/429   106/432   106/442   106/443   106/447   106/450   106/455   106/460   106/471   516/33   428/447   428/403   524/588   424/59  
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