Back to Ingredient Dictionary

POLYURETHANE-91

Description

Polyurethane-91 is a synthetic polymer widely used in cosmetic and skincare formulations as a film-forming agent and hair fixative. This versatile ingredient belongs to the family of polyurethanes, known for their durability and flexibility. In skincare and cosmetic applications, Polyurethane-91 forms a breathable, water-resistant film on the skin or hair surface, providing long-lasting hold and protection.

The molecule's structure allows it to create a uniform, flexible barrier that helps lock in moisture while still allowing the skin to breathe. This property makes it particularly useful in long-wear makeup formulations, sunscreens, and moisturizers. Polyurethane-91 also enhances the texture and spreadability of products, contributing to a smooth, even application.

In hair care products, Polyurethane-91 acts as a styling polymer, providing hold and definition without causing stiffness or flaking. Its water-resistant properties help maintain hairstyles in humid conditions. The ingredient is generally well-tolerated by most skin types and is considered non-comedogenic, making it suitable for use in products designed for acne-prone skin. However, as with any synthetic polymer, some individuals may experience sensitivity, so patch testing is recommended.