Patent Picks—Acacia, Hyaluronan, Porous Keratin and More in Skin Care

By: Rachel L. Grabenhofer

Posted: February 29, 2012

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Silicone acrylate hybride composition for topical delivery
Publication date: Feb. 28, 2012
Assignee: Dow Corning Corporation

The technology described here is a silicone acrylate hybrid composition that includes the reaction product of a silicon-containing pressure sensitive adhesive composition, an ethylenically unsaturated monomer, and an initiator. The composition, which already contains acrylate or methacrylate functionality, chemically integrates the advantageous functionalities associated with both acrylic and silicone chemistries into one stable pressure sensitive adhesive that resists phase separation. In transdermal delivery system applications, the balance of silicone to acrylic can be selectively used to control the solubility of an active agent in the composition to optimize the rate at which the active or other agent is released.

Other agents may include skin penetration or permeation enhancers, accelerants, adjuvants and sorption promoters. These enhancers can be used, for example, to change the ability of the stratum corneum to retain moisture, soften the skin, improve the skin's permeability, act as penetration assistants or hair-follicle openers, or change the state of the skin including the boundary layer. Some of these enhancers have more than one mechanism of action but in essence, they serve to enhance the delivery of the active agent to the substrate.

Striped liquid personal cleansing compositions containing a cleansing phase and a separate benefit phase with improved stability
US Patent 8124573
Publication date: Feb. 28, 2012
Assignee: The Procter & Gamble Company

Disclosed in this patent are personal cleansing compositions that consist of a cleansing phase comprising a surfactant and water, and a separate, substantially anhydrous benefit phase comprising a hydrophobic skin benefit agent. The cleansing and benefit phases have substantially the same density, wherein the cleansing composition is in a form selected from: liquid, semi-liquid, cream, lotion, gel and mixtured forms thereof. Specifically, the striped liquid personal cleansing composition includes: a) a cleansing phase, comprising from about 1% to about 50% w/w of a surfactant; wherein the cleansing phase is non-Newtonian shear thinning, and has a viscosity of equal to or greater than about 3,000 cps and a yield value of at least about 0.1 Pa; and b) a benefit phase comprising from about 20% to about 100% w/w of the benefit phase of a hydrophobic material selected from: lipids, hydrocarbons, fats, oils, hydrophobic plant extracts, fatty acids, essential oils, silicone oils and mixtures thereof.