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US 6,602,515 B2Granted
Photo stable organic sunscreen compounds with antioxidant properties and compositions obtained therefrom
AssigneeEM Industries
InventorRatan K. Chaudhuri
Life of this patent
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Abstract
A compound of formula I wherein A is a moiety which provides UV absorbing activity to the compound of formula I that comprises 1 divalent group or 2 monovalent groups, with at least one group having carbonyl (C═O) functionality, and each R is independently linear or branched C1-C8 alkyl. Sunscreen formulations which contain these compounds and methods using these compounds to prepare formulations are also provided.
Claims34
A compound of formula II
- wherein
- each R is independently linear or branched C1 to C8 alkyl;
- R1 is selected from the group consisting —C(O)CH3, —CO2R3, —C(O)NH2 and —C(O)N(R4)2;
- X is O or NH;
- R2 is linear or branched C1 to C20 alkyl;
- R3 is linear or branched C1 to C20 alkyl;
- and
- each R4 is independently hydrogen or linear or branched C1 to C8 alkyl.
5 more elements
A compound of one of the formulae
- wherein
- R1 is selected from the group consisting —C(O)CH3, —CO2 (C1-C8 alkyl),
- —C(O)NH2, —C(O)NH(C1-C4 alkyl), and —C(O)N(C1-C4 alkyl)2;
- X is O or NH;
- and
- R2 is C1-C12 alkyl.
3 more elements
Dependencies are inferred from the claim text.