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UTILITY OF ALCOHOLS AND OTHER –OH CONTAINING INGREDIENTS TO MODIFY VISCOSITY OF SUNSCREEN GELS CONTAINING SPECIALTY POLYMERS

IP.com Disclosure Number: IPCOM000210065D
Publication Date: 2011-Aug-24
Document File: 10 page(s) / 31K

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Abstract

The specialty polymers offered by Arizona Chemical under the trade names SYLVACLEAR™, UNICLEAR™ and SYLVASOL™ are vegetable oil-based organic liquid structurants (also referred to as “gellants”) with unique performance characteristics and multi-functional benefits. These skin-friendly Polyamide polymers can turn almost any liquid into a clear solid, allow the formation of emulsions with little or no surfactant, and are compatible with many cosmetic active ingredients. These vegetable derived polyamides, produced using naturally occurring fatty acids, offer a broad range of functionality to personal care formulations (1).

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UTILITY OF ALCOHOLS AND OTHER -OH CONTAINING INGREDIENTS TO MODIFY VISCOSITY OF SUNSCREEN GELS CONTAINING SPECIALTY

POLYMERS

Date: August 18, 2011


Authors: Ramachandra Shastry, Ph. D. and Linda Davis, Arizona Chemical Company


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Contents Page

Introduction……………………………………………………………………………….. 3 Mechanism of Gelation………………………………………………………………………….3

Specialty Polymers and Sun Care..……………………………………………………….5 Sunscreen Products and Polyamide Polymers………….………………………………..6 Appendices…………………………………………………………………………………8 Reference…………………………………………………………………………………..10


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INTRODUCTION

The specialty polymers offered by Arizona Chemical under the trade names SYLVACLEAR™, UNICLEAR™ and SYLVASOL™ are vegetable oil-based organic liquid structurants (also referred to as "gellants") with unique performance characteristics and multi-functional benefits. These skin-friendly Polyamide polymers can turn almost any liquid into a clear solid, allow the formation of emulsions with little or no surfactant, and are compatible with many cosmetic active ingredients. These vegetable derived polyamides, produced using naturally occurring fatty acids, offer a broad range of functionality to personal care formulations (1).

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Figure 1 Three-dimensional H-bonded structure formed by Specialty Polymers

MECHANISM OF GELATION

Gelation is the formation of a clear, immobile, soft, shear-thinning solid by the simple process of heating a mixture of the polymer and the host liquid until the polymer dissolves, then cooling the

H-Bonding locks in the structure

Hydrophobic pocket collects (traps) oils



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mixture. A three-dimensional structure forms spontaneously from the interplay of two forces: attracting the oil phase ingredients to the hydrophobic pockets formed by the fatty dimer chains and interaction of the polymeric gellant chains via Hydrogen bonding (H- bonding)(Figure 1)


(1). The resulting gels are thermo reversible. The strength of these gels is controlled by the concentration and the type of polymer. Use levels can vary between 1-30%, depending on the application, forming soft gels to hard sticks. Typically, when the polymer concentration is 1-5%, soft gels are formed. Uniquely, unlike thickeners, the gels do not become less elastic when diluted, but become softer until collapsing. These gels are also thixotropic in nature (at1-5% loading). Thus shear alone can break the gel structure. However, when left undisturbed, the gel is reformed. These characteristics have m...