What Is Dilinoleic Acid/Glycol Copolymer?
Dilinoleic Acid/Glycol Copolymer is a plant-derived polymer created by combining dilinoleic acid, a dimer of linoleic acid found in oils like soybean or sunflower, with ethylene glycol. The result is a flexible film-forming material that remains soluble in many cosmetic bases yet dries to a light, breathable layer on skin or hair. Chemists started exploring this polymer in the late 1990s as consumers looked for more naturally sourced alternatives to petroleum-based resins. Its commercial production begins with the controlled heat treatment of linoleic acid to form dilinoleic acid, followed by an esterification step where the acid reacts with ethylene glycol. The finished polymer is purified, then supplied as a viscous liquid or solid flakes ready for formulation.
You will most often spot Dilinoleic Acid/Glycol Copolymer in long-wear makeup such as foundations, mascaras and liquid lipsticks. It also shows up in sunscreens, primers, moisturizers that promise an “anti-pollution” shield, sheet masks and lightweight hair styling gels where a flexible hold is desired.
Dilinoleic Acid/Glycol Copolymer’s Cosmetic Benefits/Uses
In formulas, Dilinoleic Acid/Glycol Copolymer acts mainly as a film former. This means it creates a thin, invisible layer that clings to skin or hair. The film helps pigments stay put, boosts water and sweat resistance, cuts down on smudging and transfers and gives products a smooth glide during application. Because the film is flexible it moves with facial expressions without cracking and it can reduce moisture loss, leaving skin feeling soft and comforted.
Who Can Use Dilinoleic Acid/Glycol Copolymer
Dilinoleic Acid/Glycol Copolymer is considered suitable for most skin types including oily, combination, normal and dry skin because its lightweight breathable film does not trap excess oil yet still helps reduce moisture loss. Those with very acne-prone skin might want to monitor how their skin responds since any film former has a small chance of contributing to congestion if layered with heavy products, though this polymer is generally regarded as low risk.
The material is sourced from plant oils and ethylene glycol so it contains no animal-derived components, making it appropriate for vegans and vegetarians.
No data suggest the ingredient poses a unique risk to women who are pregnant or breastfeeding when used topically. The polymer is large and stays on the skin surface rather than absorbing into the bloodstream. This is not medical advice and anyone who is pregnant or nursing should run any skincare product past a physician to be safe.
Dilinoleic Acid/Glycol Copolymer is not known to increase photosensitivity, and it is stable under sunlight, so regular daytime use alongside sunscreen is fine.
Potential Side Effects/Adverse Reactions
Reactions to topical Dilinoleic Acid/Glycol Copolymer vary from person to person. The issues listed below are only potential side effects and are unlikely to occur for most users when the ingredient is formulated and used correctly.
- Mild skin irritation such as redness or itching, usually linked to individual sensitivity
- Temporary clogged pores or breakouts in individuals highly prone to comedones
- Eye irritation or watering if the product migrates into the eye area
- Allergic contact dermatitis in rare cases of true allergy to the polymer or other formula components
- Heavy or tight skin feel if applied in thick layers which can be uncomfortable for some users
If any adverse reaction occurs stop using the product and seek medical advice if symptoms persist or worsen.
Comedogenic Rating
Rating: 1/5. Dilinoleic Acid/Glycol Copolymer sits on the skin as a breathable film and does not contain heavy oils or waxes that typically clog pores. Its large polymer size keeps it mostly on the surface rather than seeping into follicles, so it has a very low tendency to trigger comedones. It is generally suitable for acne-prone or breakout-prone skin, though piling multiple occlusive layers over it could increase congestion for some users. Because it helps repel water, a thorough cleanse at the end of the day is advised to make sure the film is fully removed.
Summary
Dilinoleic Acid/Glycol Copolymer is valued for one key job: forming a flexible, invisible film that locks pigments in place, boosts water and sweat resistance and lightly seals in moisture. By reacting plant-derived dilinoleic acid with ethylene glycol, chemists create a polymer that spreads easily then dries down without feeling stiff. This makes it a go-to choice for long-wear makeup, smudge-proof sunscreens and light hold hair products.
While not as famous as silicone or acrylate resins, it is gaining steady popularity among brands looking to tout plant-based ingredients and cleaner labels. Its safety profile is strong, with low irritation and minimal comedogenic risk for most users. Still, everyone’s skin is unique so it is smart to patch test any new product containing this polymer before full-face or daily use.