Polyglycerol-10 Ricinoleate (Emulsifier)

Polyglycerol-10 Ricinoleate – Non-Ionic Emulsifier with High Amphiphilicity and Thermal Stability

Chemical Structure and Synthesis
Polyglycerol-10 ricinoleate is produced by the esterification of polyglycerin-10 (decaglycerin, a polymer consisting of ten glycerol units) with ricinoleic acid, the main fatty acid found in castor oil. Depending on reaction conditions, one or more hydroxyl groups of the polyglycerol backbone are substituted with ricinoleate fragments. The synthesis can be represented as:
Polyglycerin-10 + p Ricinoleic Acid → Polyglycerol-10 Ricinoleate + p H₂O
where p represents the degree of esterification. By selecting appropriate reaction conditions (catalyst, temperature, and stoichiometry), the degree of esterification and thus the hydrophilic-lipophilic balance of the product can be precisely controlled to meet specific formulation requirements.

Physicochemical Properties

• High amphiphilicity: The combination of an extensive hydrophilic polyglycerol backbone (ten glycerol units) with multiple lipophilic ricinoleate chains ensures excellent compatibility with both aqueous and oil-based systems, effectively reducing interfacial tension.

• Thermal stability: The polyglycerol backbone provides structural integrity at elevated temperatures, ensuring consistent performance even under challenging processing conditions.

• Emulsifying activity: The long hydrophilic chain and multiple ricinoleate fragments stabilize both water-in-oil (W/O) and oil-in-water (O/W) emulsions, resulting in homogeneous and stable formulations.

• Film-forming properties: Forms protective films that enhance the tactile qualities of cosmetic products and improve product longevity.

• Skin conditioning: The polyglycerol moiety provides humectant properties, enhancing skin hydration and softness.

• Solubility: Soluble in oils and organic solvents; dispersible in water.

• Non-ionic: Compatible with a wide range of ingredients and pH levels.

• Chemical stability: Ester bonds are resistant to moderate temperatures and aggressive environments, ensuring a long shelf life.

• Biodegradable and derived from renewable castor oil sources.

Applications

• Cosmetics and personal care: Used as a primary or co-emulsifier, emollient, and moisturizer in W/O and O/W creams, lotions, serums, sunscreens, makeup removers, lip products, and hair care formulations. Provides stable, elegant textures with good spreadability, enhanced hydration, and a smooth, non-greasy feel.

• Pharmaceuticals: Employed as an emulsifier, solubilizer, and penetration enhancer in topical ointments, creams, and suppositories for uniform delivery of active ingredients.

• Specialty polymers and industrial: Applied as a lubricant, plasticizer, and dispersant in specialty chemical formulations and protective films.

Key Benefits

• Effective emulsification for both W/O and O/W systems.

• High amphiphilicity and thermal stability – reliable over a wide temperature range.

• Mild and non-irritating – suitable for sensitive skin and baby products.

• Provides moisturizing, skin-softening, and film-forming properties.

• Biocompatible, biodegradable, and of natural origin.

• Compatible with a wide range of cosmetic, food, and pharmaceutical ingredients.

• Acts as a co-emulsifier, thickener, and stabilizer in complex formulations.

Recommended Use
Typical usage levels range from 1–5% of the formulation, depending on the desired emulsion stability, viscosity, and moisturizing effect. For optimal performance, dissolve in the oil phase at elevated temperatures (60–70°C) before emulsification. Can be combined with co-emulsifiers and thickeners for tailored rheology.

Safety and Handling

• Generally recognized as safe (GRAS) for use in cosmetics and personal care at recommended concentrations.

• Low irritation potential; well-tolerated by skin.

• Avoid contact with strong oxidizers and acids.

• Store in a cool, dry place, away from direct sunlight.

• Use appropriate personal protective equipment (gloves, safety goggles) when handling.

Quality Assurance
Each batch is tested for acid value, saponification value, and emulsification performance to ensure consistent quality.