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US 6,440,401 B1Granted
2-phenyl-benzimidazolesulfonic acids as UV-B filters
AssigneeMerck Patent Gesellschaft mit beschraenkter Haftung
InventorsUlrich Heywang, Michael Schwarz, Frank Pflücker
Life of this patent
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Abstract
Disclosed is a 2-phenyl-benzimidazolesulfonic acid according to the formula in which n is 0, 1 or 2 and m is 2 or 3, R1, R2, R3, R4 and R5, are each a radical such as H, C1-8-alkyl, C1-8-alkoxy, hydroxyl, sulfate, nitro, F, Cl, Br or I radicals, and R6 is a C1-8-alkyl or C1-8-alkoxy radical. This compound can be effectively used as a UV filter, and as part of a cosmetic formulation which comprise these compounds. A process for preparation of the compound is disclosed as well.
Claims25
A 2-Phenylbenzimidazolesulfonic acid according to the formula I
- wherein
- n is 0-2 and
- m is 2-3,
- R1, R2, R3, R4 and R5 each are a radical selected from H, C1-8-alkyl, C1-8-alkoxy, hydroxyl, sulfate, nitro, F, Cl, Br and an I radical, and
- R6 is a C1-8-alkyl or C1-8-alkoxy radical.
2 more elements
Dependencies are inferred from the claim text.