ALKYL GLYCOSIDE-BASED MICELLAR THICKENERS FOR SURFACTANT SYSTEMS
Publication Date: 2012-Dec-14
The IP.com Prior Art Database
A surfactant-based composition including a surfactant, the rheology modifier, and water is disclosed. The rheology modifier includes a mixture of alkyl glycoside fatty acid esters including a long chain fatty acid ester of an alkyl glycoside and a short chain fatty acid ester of an alkyl glycoside. The long chain fatty acid ester includes at least one fatty acid residue: R1(O)O-, wherein R1 is a C12 or higher hydrocarbon. The short chain fatty acid ester includes least one fatty acid residue: R2(O)O-, wherein R2 is a C6-C10 hydrocarbon.. In addition, these compounds have been found to mitigate irritation to the skin and eyes induced by anionic surfactants contained in personal care and home care cleansing compositions.
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FIELD OF INVENTION
 The present embodiment relates to rheology modifiers and finds particular application in connection with an esterified glycoside compound and a surfactant-based composition which includes the compound.
 Liquid aqueous compositions containing surfactants, such as shampoos, liquid soaps, body washes, facial cleansers, other personal care, pharmaceutical and industrial products, typically contain thickeners in order to increase the viscosity of the liquid composition. This enables convenient delivery and handling of the formulated product.
 Traditional thickeners which have been used in such compounds include a diversity of anionic, cationic and nonionic synthetic polymers, such as carboxylated and quaternized polyacrylates and polyvinyl compounds. Typical nonionic synthetic polymers include polyvinylpyrrolidone, polyethylene glycol (PEG), and alkoxylated polyols containing lipophilic substituents, such as PEG150 distearate, and ethoxylated methyl glucoside esterified with a fatty acids. Other thickeners which have been used include naturally derived anionic and cationic gums, such as chemically modified cellulose, xanthan gum, tara gum, and guar gum, and a variety of inorganic clays, salts, and electrolytes. A comprehensive list of rheology modifiers is found in the International Cosmetic Ingredient Dictionary and Handbook by T. Gottschalk and H.P. Breslawec, "International Cosmetic Ingredient Dictionary and Handbook," pages 3974-3977, 14th Edn, Personal Care Products Council Publisher, Washington, DC, USA (2012). Additional information regarding the physical and chemical mechanisms through which the different thickeners confer viscosity to surfactant compositions is discussed in E. Desmond Goddard, "Principles of Polymer Science and Technology in Cosmetics and Personal Care," Cosmetic Science and Technology, 1 edition (March 10, 1999), Informa HealthCare, and in "Polymers in Aqueous Media - Performance through Association," J. E. Glass, Editor,
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Advances in Chemistry Series No. 223, American Chemical Society, Washington DC (1989).
 One group of nonionic thickeners includes relatively low molecular weight compounds of various types, such as nonionic alkoxylated surfactants, aliphatic amides, fatty alcohols, hydrophobically modified alkoxylated molecules, which are able to provide increased viscosity to liquid surfactant-based compositions. The mechanism through which these compounds increase the viscosity of aqueous surfactant compositions is thought to be by selective association with the surfactant micelles themselves. These compounds are often referred to as associative thickeners or micellar thickeners because they thicken through association with a surfactant, perhaps through hydrophobic or lipophilic substituents on these small molecules.
 Preparation of fatty acid modified...