Polyisobutene is a polymer derived from isobutene, a gaseous hydrocarbon, and appears as a clear, colorless to pale yellow, viscous liquid with a thick consistency. It is primarily utilized as an emollient in cosmetics, providing moisturizing and protective properties to the skin. It forms a thin, occlusive film on the skin's surface, preventing water loss and maintaining skin hydration. Polyisobutene is commonly found in various cosmetic products such as lip balms, moisturizers, foundations, and lipsticks, adding moisturization and texture-enhancing benefits. The high molecular weight of this ingredient contributes to its thick texture and non-greasy feel. The chemical formula of Polyisobutene is (C4H8)n, where "n" represents the repeating units in the polymer chain.
Origin
Polyisobutene is typically produced through the polymerization of isobutene monomers. The polymerization reaction involves combining isobutene in the presence of a catalyst, such as aluminum chloride or boron trifluoride.
Safety profile
Polyisobutene is generally regarded as safe for cosmetic use, posing minimal risk of skin irritations or allergies. It is non-comedogenic, meaning it does not clog pores or promote acne formation. Moreover, Polyisobutene is derived from petroleum or plant-based sources, making it suitable for vegan-friendly cosmetic formulations.