Dilinoleic Acid/Propanediol Copolymer

Dilinoleic Acid/Propanediol Copolymer is a high–molecular weight emollient/film-forming polymer used at low-to-moderate levels to improve texture and reduce tack, and it is not pH-dependent or biologically “active” in the way exfoliating acids/retinoids are. Available safety/patch-test experience for similar fatty-acid polyesters/copolymers suggests low irritation potential because they are largely non-penetrating and function as inert emollients. In severely reactive or eczema-prone patients, any film former can very occasionally contribute to stinging on compromised skin, but overall the clinical expectation is very gentle, supporting a 0.2 score. Safety Notes: Dilinoleic Acid/Propanediol Copolymer is used as a lipidic film-former/emollient and viscosity/texture modifier, and is commonly encountered at low levels (~0.1–1%) in leave-on moisturizers, sunscreens, and color cosmetics to improve sensorial feel, wear, and barrier properties. Higher-strength consumer products (typically anhydrous balms, lip products, long-wear primers/foundations, and rich occlusive creams) can use it as a primary structuring/film-forming resin in the ~3–8% range without being professional-only. Rinse-off products generally sit at the low end because the performance benefit is diminished on wash-off and higher levels can add unwanted residue.