Polyglyceryl-3 Stearate is a cosmetic ingredient extensively used as an emulsifier and skin conditioner in a variety of skincare and makeup products. It is synthesized by the esterification of polyglycerin-3 with stearic acid, resulting in an ester known as the ester of triglycerol and stearic acid. This ingredient is highly valued for its ability to stabilize both oil-in-water and water-in-oil emulsions, enhancing the texture and moisturizing properties of cosmetic formulations.

Chemical Composition and Structure

This ester combines the emollient and hydrating benefits of polyglycerin-3, a polymer of glycerol known for its moisturizing effects, with the properties of stearic acid, a saturated fatty acid that contributes to the viscosity and stability of emulsions. The resulting ester is effective in improving the consistency and spreadability of cosmetic products.

Physical Properties

Polyglyceryl-3 Stearate typically appears as a creamy, white to off-white solid or viscous liquid at room temperature. It is soluble in oils and has limited solubility in water, making it an ideal choice for creating rich, creamy textures in cosmetic products.

Production Process

Synthesis: The synthesis of Polyglyceryl-3 Stearate involves the controlled esterification of polyglycerin-3 with stearic acid. This process requires accurate temperature control and the use of catalysts to promote efficient ester linkage and ensure high product quality.
Purification: After synthesis, the product undergoes rigorous purification processes to remove any unreacted starting materials and by-products, ensuring purity suitable for cosmetic use.
Quality Control: Extensive quality control tests are performed on the final product to ensure its stability, efficacy, and compatibility with other cosmetic ingredients. These tests typically include evaluations of viscosity, emulsion stability, and performance in final product formulations.

Applications

Cosmetic Products: Widely used in creams, lotions, and facial moisturizers, where it serves as an effective emulsifier, helping to blend and stabilize the mixture of oil and water components, thereby improving the product's texture and application properties.
Skin Care: Ideal for use in moisturizing formulations aimed at providing a rich, luxurious feel while delivering hydration and improving skin barrier function.
Makeup: Employed in foundations and concealers to enhance their texture and extend wearability, providing a smooth, even coverage.

Environmental and Safety Considerations

Polyglyceryl-3 Stearate is considered safe for use in cosmetic products and is generally well-tolerated by the skin. It is non-irritating and suitable for all skin types, including sensitive skin. As it is derived from naturally occurring fatty acids, it is viewed as an environmentally friendly ingredient. Proper use within recommended concentrations is essential to ensure safety and optimal effectiveness.

INCI


Surfactant - Emulsifying agent. Emulsions are thermodynamically unstable and are used to soothe or soften the skin and emulsify, so they need a specific, stabilising ingredient. This ingredient forms a film, lowers the surface tension and makes two immiscible liquids miscible. A very important factor affecting the stability of the emulsion is the amount of the emulsifying agent. Emulsifiers have the property of reducing the oil/water or water/oil interfacial tension, improving the stability of the emulsion and also directly influencing the stability, sensory properties and surface tension of sunscreens by modulating the filmometric performance.
Synonyms:

CAS: 27321-72-8 / 26855-43-6 EC number 248-403-2