Stearyl Stearate
Cetyl Stearate, 1-Octadecanol, 1-Stearate
I. Basic Information
CAS No.: 110-61-6
Molecular Formula: C₃₆H₇₂O₂
Molecular Weight: 544.96
Synonyms: Cetyl Stearate, 1-Octadecanol, 1-Stearate
II. Physical & Chemical Properties
Appearance: White to off-white waxy solid
Melting Point: 69-72°C
Boiling Point: 380°C (decomposes)
Solubility: Insoluble in water, soluble in ether, chloroform, and hot ethanol
Density: 0.84 g/cm³ at 25°C
III. Production Methods
Esterification: Reaction of stearic acid with stearyl alcohol in the presence of an acid catalyst (e.g., sulfuric acid) under reflux conditions.
Transesterification: Conversion of triglycerides (e.g., from vegetable oils) with methanol to produce methyl esters, followed by alcoholysis with stearyl alcohol.
IV. Applications
Cosmetics & Personal Care: Used as an emollient, thickener, and stabilizer in creams, lotions, and lipsticks to improve texture and skin feel.
Pharmaceuticals: Acts as a base for ointments and suppositories, providing a smooth consistency and controlled release of active ingredients.
Plastics & Polymers: Functions as a lubricant and mold release agent in the production of plastics and resins.
V. Application Cases
Cosmetic Creams: Added to moisturizing creams at concentrations of 2-5% to enhance spreadability and provide long-lasting hydration.
Lipstick Formulations: Incorporated at 3-8% to improve the hardness and gloss of the lipstick bullet, preventing it from melting at room temperature.
Pharmaceutical Ointments: Used as a base in topical ointments for dermatological treatments, ensuring even distribution of active compounds on the skin.
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