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pH stability of hydroxyalkylurea in combination either with one or more of a cyclic (lactone) and/or acyclic ester

IP.com Disclosure Number: IPCOM000033672D
Publication Date: 2004-Dec-22

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention relates to compositions for personal care products which have a composition containing 1 to 50% hydroxyalkylurea in combination with either one or more of a cyclic and/or acyclic ester present at 0.01 to 15%. Hydroxyalkylurea is derived from urea, wherein the 4 hydrogen radicals on the nitrogen atoms of a urea molecule may be replaced by a C1-4 alkyl or a lower C2-6 hydroxyalkyl group, which may contain from 1 to 5 hydroxyl or hydroxyalkyl groups, providing at least one of the radicals on one of the nitrogen atom of a urea molecule is a hydroxyalkyl or oligohydroxyalkyl group. Preference is given to N-2-hydroxyethylurea with a hydroxyethyl group on one of the nitrogen atom of a urea molecule. Hydroxyalkylurea is a moisturizing agent that can be used either alone, or in combination with at least one or more other moisturizing agents, for skin and hair. This topic will be the subject of future publications.

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TITLE:

pH stability of hydroxyalkylurea in combination either with one or more of a cyclic (lactone) and/or acyclic ester.

ABSTRACT: 

The present invention relates to compositions for personal care products which have a composition containing 1 to 50% hydroxyalkylurea in combination with either one or more of a cyclic and/or acyclic ester present at 0.01 to 15%.

Hydroxyalkylurea is derived from urea, wherein the 4 hydrogen radicals on the nitrogen atoms of a urea molecule may be replaced by a C1-4 alkyl or a lower C2-6 hydroxyalkyl group, which may contain from 1 to 5 hydroxyl or hydroxyalkyl groups, providing at least one of the radicals on one of the nitrogen atom of a urea molecule is a hydroxyalkyl or oligohydroxyalkyl group.  Preference is given to N-2-hydroxyethylurea with a hydroxyethyl group on one of the nitrogen atom of a urea molecule.

Hydroxyalkylurea is a moisturizing agent that can be used either alone, or in combination with at least one or more other moisturizing agents, for skin and hair. This topic will be the subject of future publications.

           

DETAILED DESCRIPTION:

The present invention relates to the pH stability of compositions comprising of: hydroxyalkylurea, urea and its derivatives, and ammonium lactate, either alone or in combination, as well as either one or more of a cyclic and/or acyclic ester.  These compositions may also contain hydroxyalkylurea either alone or in combination with other moisturizing agents. Other moisturizing agents include, but are not limited to glycerol, urea, and sodium pyrrolidone carboxylic acid (sodium PCA), sucrose, and sorbitol.

Traditionally, improved moisturizing characteristics are obtained by adding higher amounts of one or more moisturizing agents to a formulation.  However, cosmetic compositions containing the known moisturizing agents suffer from numerous disadvantages.  Some of the main drawbacks of moisturizing agents, such as glycerin, sucrose, and sorbitol include tackiness, greasiness, residue, and gloss on the skin during and after application of a cosmetic product containing these ingredients.  These negative attributes create a formidable challenge for cosmetic formulators to develop new products with higher levels of moisturization that meet or exceed consumer sensory expectations.  To minimize the negative sensory attributes of glycerin, it is often used in combination with silicones and other aesthetic enhancing agents.  In some cases, more expensive moisturizing agents like sodium PCA are used to replace glycerin in the formulation.  In addition, other formulation problems can occur including unpleasant odors, unstable pH, and incompatibility with certain raw materials when urea, lactic acid, glycolic acid, maleic acid, acetic acid, and salicylic acid are used to replace glycerin in the formulation.  Therefore, the problem to be solved by this invention is to provide a combination of two or more moisturizing agents that delivers moisturiza...