Isostearic acid is a branched-chain saturated fatty acid, differing from stearic acid due to its methyl branch. This structural difference results in altered physical properties, mainly a liquid state at room temperature. It is a synthetic fatty acid.

The production of isostearic acid typically involves the oligomerization of unsaturated fatty acids, like oleic acid, followed by hydrogenation. First, unsaturated fatty acids are reacted under specific catalytic conditions to form dimers and trimers. Next, the resulting mixture is hydrogenated to saturate the double bonds, creating a stable, saturated isostearic acid mixture. Fractional distillation isolates isostearic acid from other byproducts.

As an emollient, isostearic acid softens and soothes the skin by forming an occlusive layer, preventing moisture loss [1]. It enhances the texture and spreadability of cosmetic formulations [2]. Isostearic acid functions as a binder, holding ingredients together in pressed powders and makeup formulations [3]. It can help to control the viscosity of formulations

Isostearic acid is commonly used in skin care products, such as lotions, creams, and serums, providing a non-greasy feel [4]. In makeup, it's found in lipsticks, foundations, and mascaras, contributing to even application and long wear [5]. Hair care products utilize isostearic acid to add shine and manageability [6].

Isostearic acid is typically packaged in drums, IBCs (Intermediate Bulk Containers), or smaller containers, depending on the quantity. Transportation should adhere to standard practices for non-hazardous materials, stored in cool, dry conditions, away from direct sunlight and heat sources [7].

Citations:

[1] Draelos, Z. D. (2018). Cosmetics Dermatology. John Wiley & Sons.
[2] Lodén, M., & Wessman, W. (2001). Effect of moisturizers on epidermal barrier function. Contact Dermatitis, 44(5), 299-306.
[3] Schlossman, M. L., & Kaprowski, F. E. (2009). The Chemistry and Manufacture of Cosmetics. Allured Publishing Corporation.
[4] Huang, T. H., et al. (2009). Cosmetic and dermatologic vehicles: a review. Journal of the American Academy of Dermatology, 61(6), 1117-1127.
[5] Parente, M. E. L. (2017). Formulation and Function of Cosmetics. John Wiley & Sons.
[6] Gavazzoni Dias, M. F. R. (2015). Hair cosmetics: an overview. International Journal of Trichology, 7(1), 2-15.
[7] MSDS of Isostearic Acid. Supplier's Material Safety Data Sheet.

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