Visually Indicating Wipe Efficacy and Other Topics: Literature Findings

By: Charles Fox, Independent Consultant

Posted: December 30, 2009, from the January 2010 issue of Cosmetics & Toiletries.

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Interesting Compositions
Solid particles dispersion: The Procter & Gamble Company has patented stable dispersions of solid particles such as pigments in a hydrophobic solvent for cosmetic use, in addition to a method for preparing the mixtures.¹⁶ The method utilizes an acrylate copolymer of long siloxane chains to create stable dispersions of solid particles in hydrophobic solvents having a solubility parameter of approximately eight or less, such as a silicone fluid. An example of a moisturizing lotion is shown in Formula 3. The moisturizing lotion disclosed was applied to the face and/or body to provide softening, moisturizing and conditioning benefits.

Wipe to visually indicate efficacy: Kimberly-Clark Worldwide Inc. has patented a cosmetic wipe that contains a first nonwoven layer having first and second opposing surfaces and a second nonwoven layer that together visually indicate the wipe’s effectiveness.¹⁷ The first nonwoven layer contains fibers formed from a polymer composition that is generally opaque in nature. The second nonwoven layer is laminated to the first surface of the first nonwoven layer and contains a colorant.

Prior to use, the colored second layer is generally not visible due to the opaque nature of the first layer. However, when sebum or other body oils are absorbed by the first layer, at least a portion of it becomes translucent or transparent so that the color of the second layer is revealed to a user. This provides a variety of benefits, including the ability for a user to evaluate if or how much sebum was removed from the skin so that makeup can be applied with confidence.

Preventing large aluminum species in AP/deo: Colgate-Palmolive Company has disclosed antiperspirant active compositions comprising an aluminum salt with a size exclusion chromatography (SEC) chromatogram exhibiting a high SEC Peak-4 intensity.¹⁸ The antiperspirant composition contains an aluminum salt with an aluminum to chloride molar ratio of approximately 0.3:1 to 3:1, exhibiting an SEC chromatogram having an SEC Peak-4 to Peak-3 intensity ratio of at least 7, and a Peak-4 intensity greater than a Peak-5 intensity in aqueous solution. The composition can optionally include zirconium. In addition, methods and processes of making the composition are described.

For the disclosed composition, a 0.72 M aluminum chloride hexahydride was buffered with 20 mmol betaine monohydrate, held at 90°C and stirred vigorously. To this solution, a 4N calcium hydroxide (20 mmol) was added dropwise over a 90 min period. A ratio of hydroxide to aluminum of 2.22 was employed in an attempt to prevent the formation of large aluminum species. The pH after the reaction was 2.56 due the low hydroxide/aluminum ratio. The SEC chromatogram showed exclusively SEC-Peak 4 and SEC-Peak 5; no SEC-Peak 3 species were observed at a retention time of approximately 15.5 min. Reproduction of this article without expressed written consent is prohibited.