Isophorone Diamine …

This is a synthetic polymer created by combining four chemical components: isophorone diamine, cyclohexylamine, isophthalic acid, and azelaic acid. The result is a large molecular structure designed to sit on the skin's surface rather than penetrate deeply.Its primary function is film-forming, which means it creates a thin, continuous layer across the skin. This is particularly useful in formulations where a smooth, even finish or improved texture is desired.

As a film-former, this polymer works by depositing a thin, flexible coating on the skin's surface. Rather than absorbing into the skin, it sits on top and hardens slightly, creating a smoother plane that can refract light differently and make imperfections less noticeable.The azelaic acid component may offer some additional benefit, as this ingredient is recognised for its role in addressing certain skin concerns, though in a copolymer its activity is likely different from when used alone.

This ingredient is typically found in base products such as primers, foundations, and some serums. Use as directed by the formulation. If using a primer containing this polymer, apply a small amount to clean, moisturised skin before foundation for best results. A little goes a long way.

This polymer is generally well-tolerated and has a long history of use in cosmetic formulations. Those with very sensitive skin should patch test first, as with any new product.