From Caper to Prickly Pear for Dermatitis to Dual Phase Mouthwash: Literature Review

By: Charles Fox (See In Memory Sidebar)

Posted: June 29, 2010, from the July 2010 issue of Cosmetics & Toiletries.

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Oral Care
Dual phase mouthwash: Colgate- Palmolive Co. discloses oral compositions comprising a hydrophobic phase, a hydrophilic phase and a hydrotrope component, and methods of use thereof.¹⁴ The described inventions were incorporated into a dual phase mouthwash, wherein the hydrophilic and hydrophobic phases remain separate and form a temporary emulsion when mixed. This emulsion spontaneously reverts back to the two original phases after rest without forming an emulsion. An example is shown in Formula 8.

Imparting white to teeth: Lion Corp. has patented a press transfer seal system along with a method for beautifying the surfaces of teeth.¹⁵ The system setup involves laminating a substrate and a pressure-sensitive adhesive layer with a wax layer placed between both. The pressure-sensitive adhesive layer is applied facing the teeth, forming a seal against them, and the substrate is then peeled away to transfer the wax and adhesive layers to the teeth. This invention makes it possible to easily and simply impart a natural, durable color to the surface of teeth.

The pressure-sensitive adhesive layer is made from a composition comprising a component selected from: alkyl (meth)acrylate copolymers, (alkyl (meth)acrylate/diacetone acrylamide) copolymers, methyl methacrylate/butyl methacrylate/dimethylaminoethyl methacrylate copolymers, and methyl methacrylate/ethyl acrylate/chlorotri-methylammoniumethyl methacrylate copolymers; and a plasticizer. The surface of the substrate to come into contact with the wax layer is coated with silicone.

Interesting Materials and Compositions
Cross-linking for new properties: O’Lenick has disclosed¹⁶ a series of cross-linked silicone polymers for cosmetics that, by virtue of the nature of the dimol alcohol undecylenic acid ester based cross-linker, exhibit unique solubility and properties including improved tolerance for oily materials and improved skin feel. These polymers find use in personal care applications such as pigmented products. In the personal care arena, solid products that do not experience syneresis—i.e., the condition in solid products that causes incompatible liquid to ooze out—are important since this condition is cosmetically unacceptable.

Aerosol dispensed solvated active: S.C. Johnson and Son Inc. discloses compositions containing one or more aqueous solvated active agents suitable for dispensing as compressed gas aerosols.¹⁷ The compositions include at least one surfactant, at least one active agent such as a fragrance or an insecticide, and a compressed gas propellant. Preferably, the surfactant is present at approximately 0.1% to 3.0% w/w while the active agent is present at about 0.1% to 2.0% w/w. The compressed gas propellant preferably is present in an amount from about 0.1% to 1.0% w/w and the total surfactant weight to active agent ratio for the composition is from 1:3 to 5:1. The composition uses a reduced amount of surfactant and active agent, thereby allowing for a more efficient active agent loading and reduced stickiness or tackiness on surfaces contacted during use. An example is shown in Formula 9.