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Topical composition

  • US 20050074474A1
  • Filed: 10/01/2004
  • Published: 04/07/2005
  • Est. Priority Date: 10/03/2003
  • Status: Abandoned Application
First Claim
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1. A topical composition comprising:

  • (1) a porous spherical disintegrative silica impregnated with a water-insoluble skin benefit agent, wherein;

    (a) the porous spherical disintegrative silica has an average volume particle size of from about 3 μ

    m to about 20 μ

    m, a maximum particle size of no more than 50 μ

    m, and a pore volume of from about 1.5 cm3/g to about 3.0 cm3/g;

    wherein when a paste is provided by mixing 40 g of squalane and 15 cm3/g of the porous spherical disintegrative silica;

    the paste is impregnated between 2 mm thickness of 2 cm diameter parallel plates; and

    the dynamic viscoelasticity of the paste is measured at the conditions of 2 Hz angular frequency and 10 Pa to 10 kPa of increasing shear stress;

    the minimum value of [dlog storage modulus of elasticity]/[dlog shearing stress] is no less than about −

    10;

    (b) the water-insoluble skin benefit agent having a solubility in water at less than about 0.1 g/l at 25°

    C. and having a molecular weight of no more than about 5,000, selected from the group consisting of liquid water-insoluble skin benefit agents, solid water-insoluble skin benefit agents which dissolve in liquid water-insoluble skin benefit agents, solid water-insoluble skin benefit agents which dissolve in emollients and/or volatile solvents, and mixtures thereof; and

    (2) a suitable carrier.

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