What Is Trimethylol Propane Cyclohexene Dicarboxylate?
Trimethylol Propane Cyclohexene Dicarboxylate is a synthetic ingredient that belongs to the family of alkyd resins. Chemically it is created by reacting trimethylolpropane, a trifunctional alcohol, with cyclohexene dicarboxylic acid. The result is a viscous resin that can be dissolved or dispersed in other cosmetic ingredients. Although the raw materials usually start from petroleum feedstocks, some manufacturers have begun to source the alcohol portion from plant based glycerin, giving the final resin a partial bio origin.
Alkyd resins were first developed for industrial paints in the early 1900s because they create tough glossy films. When formulators noticed that the same film forming trait could boost durability and shine in beauty products, lighter cosmetic grade versions like Trimethylol Propane Cyclohexene Dicarboxylate entered the market. Today it is produced in closed kettles where precise heat and vacuum drive the esterification reaction, followed by filtration to remove impurities and ensure skin friendliness.
You will most often see this ingredient in color cosmetics that need to stay put such as nail polish, mascara, liquid eyeliner and long wear foundation. It can also appear in hair styling sprays, peel off face masks and certain sunscreens where a flexible water resistant film is desired.
Trimethylol Propane Cyclohexene Dicarboxylate’s Cosmetic Benefits/Uses
This ingredient serves one main job in beauty formulas
Film forming: Once the product is applied and the volatile carriers evaporate, Trimethylol Propane Cyclohexene Dicarboxylate sets into a thin even layer on the surface. That film locks pigments in place, improves water and smudge resistance, boosts gloss and provides a smooth feel. Because the film is flexible it moves with the skin or hair instead of cracking, which helps makeup look fresh for longer wear times.
Who Can Use Trimethylol Propane Cyclohexene Dicarboxylate
This film former is considered suitable for most skin types. It sits on the surface rather than soaking deep into the skin, so dry complexions appreciate the extra barrier while normal and combination skin tolerate it well. Oily or acne-prone users generally do fine too, though very congested skin might prefer lighter finishes because any resin layer can theoretically trap sebum underneath.
Trimethylol Propane Cyclohexene Dicarboxylate is synthetic and contains no animal-derived constituents, so it aligns with vegan and vegetarian preferences. Some suppliers even highlight plant-based glycerin as the starting alcohol, which may appeal to those seeking partially bio-sourced options.
Current safety data show no specific risks for pregnant or breastfeeding women when the ingredient is used topically in cosmetics. That said this is not medical advice and anyone expecting or nursing should discuss new skincare products with their healthcare provider to be extra cautious.
The resin does not absorb UV light so it does not cause photosensitivity. It can actually add mild water resistance to sunscreens applied over or under it.
Potential Side Effects/Adverse Reactions
Responses to topical Trimethylol Propane Cyclohexene Dicarboxylate vary from person to person. The points below outline possible but uncommon issues assuming the product is formulated and used as intended and most users will not encounter them.
• Mild skin irritation or redness in people with very sensitive skin
• Allergic contact dermatitis in the rare case of individual resin sensitivity
• Temporary clogged pores or small breakouts in acne-prone areas if the film traps excess oil
• Eye stinging or watering if a mascara or liner containing the resin is applied too close to the waterline
If any discomfort or reaction develops stop use immediately and consult a qualified medical professional.
Comedogenic Rating
Rating: 1 / 5
Trimethylol Propane Cyclohexene Dicarboxylate forms a breathable yet continuous film that sits on top of the skin rather than sinking into pores. Its large molecular size and low oil content make it unlikely to block follicles, so most users will not notice clogged pores. That said any film-forming resin can trap existing sebum if layers are built up or if heavy creams are applied under it, which is why the rating is not zero.
In practical terms this ingredient is generally suitable for acne-prone or breakout-prone skin, especially when used in lightweight formulas such as liquid eyeliner or mascara.
Because it is usually paired with other resins, plasticizers or waxes, the overall pore-clogging potential of the finished product will depend on the entire formula not just this single ingredient.
Summary
Trimethylol Propane Cyclohexene Dicarboxylate is a synthetic alkyd resin prized for its film-forming ability. After application it dries into a thin flexible layer that locks pigments in place, boosts shine, adds water and smudge resistance and helps makeup or hair products last longer. It does all this by creating a tight network of ester links that harden as solvents evaporate, giving strength without brittleness.
While not a buzzworthy superstar, it is a quiet workhorse in long-wear nail lacquers, mascaras, peel-off masks and certain sunscreens. Formulators reach for it when they need durability and gloss without a heavy greasy feel.
Safety studies and decades of use show a low risk profile with only rare reports of irritation or allergy. Still, everyone’s skin is unique so it is wise to try any new product containing this resin on a small area first to make sure it agrees with you.