US 6,306,373 B1 · Mixed n-butyl and iso-propyl phthalamide compounds as sunscreen solubilizers

Abstract

The present invention is directed to a high active sunscreen composition for topical application to human skin to protect the skin against UV radiation damage. The composition is particularly suitable for over-coating with make-up or other cosmetic compositions. More particularly, the present invention is directed to the use of a specific eutectic mixture of lower alkyl phthalamide that is surprisingly effective in solubilizing 4-(1,1-dimethylethyl)-4′-methoxydibenzoylmethane (PARSOL.RTM. 1789). Such concentrates solutions of PARSOL.RTM. 1789 can be used to formulate a more effective sunscreen, having a surprisingly increased sunscreen protection factor (SPF) and such that the PARSOL.RTM. 1789 is more effective over a longer period of time so that the sunscreen composition need not be applied to the skin as frequently.

Claims8

Dependent claims

A sunscreen compositions made up of a solution of 40% to 70% by weight of 4-(1,1-dimethylethyl)-4′-methoxydibenzoylmethane, and 30% to 60% by weight of a mixed phthalamide compound conforming to the following structure;

wherein;
R is a eutectic mixture having 60-75% by weight of CH3—(CH2)3— and 25%-40% by weight

Dependencies are inferred from the claim text.

Mixed n-butyl and iso-propyl phthalamide compounds as sunscreen solubilizers

Life of this patent

Mixed n-butyl and iso-propyl phthalamide compounds as sunscreen solubilizers

Life of this patent

Abstract

Claims8