The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 2017
Filed:
May. 14, 2013
Basf SE, Ludwigshafen, DE;
Tatiana Drovetskaya, Martinsville, NJ (US);
Marc N. G. De Mul, Weston, CT (US);
BASF SE, Ludwigshafen, DE;
Abstract
The present disclosure relates to polymeric siloxane coated zinc oxide powders having a mean particle size number distribution (D50) ranging from about 300 nm to about 600 nm and their use in sunscreen compositions. The relatively high surface area (in relation to particles of <100 nm) avoids agglomeration resulting in ease of formulation and high dispersal of the particles which tends toward less light scatter and hence better transparency in formulations. Furthermore, the combination of the particular particle size number distribution (D50) of zinc oxide ranging as above with bis(resorcinyl)triazine UV absorbers shows unexpected increased UV-A absorbance (320 to 400 nm) in comparison to the zinc oxide and bis resorcinyl triazine UV absorbers on their own at the same concentration.