Multiphase sunscreen compositions

Details Multiphase sunscreen compositions Multiphase sunscreen compositions

2006-11-14

2006-11-14

Padmanabhan, Sreeni (Department: 1617)

Drug, bio-affecting and body treating compositions

Topical sun or radiation screening, or tanning preparations

C424S060000, C424S070900, C424S400000, C424S401000

Reexamination Certificate

active

07135165

ABSTRACT:
The instant invention relates to novel surfactant-free, multiphase sunscreen compositions that provide protection from the sun, have a unique visual appeal, and provide skin conditioning and moisturization. In a two-phase embodiment of the instant invention, the compositions are comprised of (1) a first layer comprising a high-density ester and sunscreen, and (2) a second aqueous layer, which is usually the top layer. In a three-phase embodiment of the instant invention, the compositions are comprised of (1) a first layer comprising a high-density ester and and sunscreen, (2) a second aqueous layer, and (3) a third oily layer. The high-density ester layer usually has a specific gravity that is greater than that of the aqueous layer and the aqueous layer usually has a specific gravity that is greater than the oily layer. In preferred embodiments, each phase is substantially clear and has a volume approximately equal to that of the other phase(s). The phases disperse upon mixing and separate over time after mixing. The phases may be colored differently to enhance visual appeal. In some embodiments, emulsified boundary layer(s) form between the phases and constitute third or fourth phases.

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