Sunscreen compositions

Details Sunscreen compositions Sunscreen compositions

1993-12-23

1995-09-26

Ore, Dale R.

Drug, bio-affecting and body treating compositions

Topical sun or radiation screening, or tanning preparations

424 60, 514844, 514847, 514938, 106436, A61K 742, A61K 744, A61K 912

Patent

active

054532671

ABSTRACT:
The invention relates to titanium dioxide sunscreen compositions containing 0.025 to 30% by weight of phosphate anions. Phosphate anions, preferably in the form of salts, have been found to prevent or reduce the rate of discolouration of titanium dioxide-containing sunscreen compositions caused by light catalysed reduction of titanium (IV) to titanium (III). Discolouration caused by the presence of parahydroxybenzoic acid esters or para-aminobenzoic acids, esters or derivatives thereof in such compositions has also been found to be reduced by the incorporation of phosphate salt.
Titanium dioxide particles having a mean primary particle size of less than 100 nm, each of the particles being substantially coated with phosphate anions are also described for use in sunscreen compositions.

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S. T. N., File Supplier, Karlsruhe, W. Germany, File C.A., vol. 19, No. 16, 16 Apr. 1979 (Columbus, Ohio).
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K. Schrader, Grundlagen und Rezepturen der Kosmetika (Cosmetic Principles and Formulations) 1979, Dr. Alfred Huthig Verlog, pp. 155-156(2).
U. Kaoru, K. Takashi, Proceedings of the 8th Intern. Congress of Rheology (1980, Plenum), vol. 3, pp. 615-620(2).

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