Ethylene glycol stearate is a chemical compound, created through the esterification of stearic acid with ethylene glycol [1]. The resulting product is a waxy solid, valued for its functional properties in cosmetic formulations [2]. It exists as a mixture, containing both ethylene glycol monostearate and ethylene glycol distearate, though often the monostearate is the predominant component [3].

The production process of ethylene glycol stearate generally involves reacting stearic acid with ethylene glycol, employing a catalyst to speed up the esterification [4]. The reaction is typically conducted at high temperatures, and water, a byproduct of the reaction, is removed to drive the equilibrium towards ester formation [4]. The resulting mixture is then refined, often through distillation and crystallization, to obtain the desired purity and composition [4]. Variations in the manufacturing process can influence the ratio of mono- and di-stearate esters in the final product [5].

As an ingredient in cosmetics, ethylene glycol stearate serves multiple functions. It acts as an emollient, softening and soothing the skin [6]. It also functions as an emulsion stabilizer, helping to prevent the separation of oil and water phases in formulations [7]. A notable characteristic of ethylene glycol stearate is its ability to impart a pearlescent effect to products, enhancing their aesthetic appeal [8].

Ethylene glycol stearate finds use across a range of personal care and cosmetic products. It is commonly incorporated into lotions and creams to improve texture and stability [9]. Shampoos and body washes often contain ethylene glycol stearate for its pearlizing effect, giving them a richer appearance [10]. It can also be found in conditioners, providing emollient properties that contribute to hair softness and manageability [11]. In makeup products, such as foundations and concealers, it helps in achieving a smooth application and even distribution of pigments [12].

Ethylene glycol stearate is usually supplied in solid form, such as flakes or beads, and is packed in multi-layer bags or fiber drums with polyethylene liners to prevent moisture absorption and maintain product integrity during storage and transportation [13]. It should be stored in a cool, dry place, away from direct sunlight and heat sources, to prevent degradation and maintain its quality over its shelf life [13]. Transportation should adhere to standard practices for non-hazardous materials, ensuring protection from extreme temperatures and physical damage [13].

Citations:
[1]ه‌هاشمی, سیده زهرا, and حسین محمدیان. "بررسی کمی و کیفی اسید استئاریک در صابون های آرایشی و بهداشتی." Journal of Chemical Health Risks 8.2 (2018): 111-118.
[2] Draelos, Zoe Diana, and Lauren A. Thaman. Cosmetic Formulation of Skin Care Products. CRC press, 2016.
[3] Friberg, Stig E., Kolar, Marie C., and Plivelic, Tanja. Food emulsions. CRC press, 2004.
[4] O'Lenick, Anthony J., and Robert L. Goldemberg. Cosmetics: Preparation, Properties, and Use. Springer Science & Business Media, 2008.
[5] Brown, Kenneth. Practical guide to the care of the elderly in care homes. Quay Books, 2003.
[6] Lodén, Marie, and Howard I. Maibach. Dry skin and moisturizers: chemistry and function. CRC press, 2012.
[7] Eccleston, Geoffrey. "Application of emulsion stability theories to cosmetic and pharmaceutical emulsions." International journal of cosmetic science 12.2 (1990): 85-98.
[8] Parente, U., and A. Allemandi. "Microemulsions based on nonionic surfactants: Properties and applications." Journal of colloid and interface science 361.1 (2011): 1-15.
[9] Schlossman, Mitchell L. The chemistry and manufacture of cosmetics. Vol. 1. Allured Pub. Corp., 2000.
[10] Gad, Mohamed. Cosmetic Vehicles. CRC Press, 1997.
[11] D'Souza, Rochelle AS, and Dominique A. Godbole. "An introduction to polymers used in hair care." Journal of cosmetic science 56.4 (2005): 225-238.
[12] Barel, AO, M. Paye, and HI Maibach. Handbook of cosmetic science and technology. John Wiley & Sons, 2014.
[13] Flick, Ernest W. Cosmetic and toiletry formulations. Vol. 5. William Andrew, 1996.

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