Ingredient review
Cocoyl Adipic Acid/Trimethylolpropane Copolymer
INCI: Cocoyl Adipic Acid/Trimethylolpropane Copolymer
A gentle film-forming polymer that helps products stay put longer without feeling heavy or sticky.
In plain English
This ingredient is a polymer—a long chain of repeating molecules—made from coconut oil and adipic acid. When applied to skin or hair, it dries down into a thin, flexible film that helps other ingredients (like sunscreen or makeup) stay in place longer and resist water or sweat. It's often used in sunscreens to improve water resistance and in long-wear makeup to prevent smudging. Unlike some older film formers, it tends to feel lightweight and not overly tight or sticky.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Cocoyl Adipic Acid/Trimethylolpropane Copolymer is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Cocoyl Adipic Acid/Trimethylolpropane Copolymer.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A semi-synthetic copolymer created by reacting cocoyl (coconut-derived) fatty acids with adipic acid and trimethylolpropane. The result is a flexible, water-resistant film-forming polymer used in cosmetics to improve wear time and water resistance.
How it works
After application, the solvent (usually water or alcohol) evaporates, leaving behind a thin, continuous film on the skin or hair. This film physically locks in other ingredients (like sunscreen filters or pigments) and creates a barrier that resists water, sweat, and friction. The coconut-derived portion adds flexibility, so the film moves with the skin rather than cracking or feeling stiff.
Pros
Flexible film
Unlike some stiff film formers, this copolymer creates a flexible layer that moves with your skin, reducing the chance of cracking or discomfort.
Water resistance
It significantly improves water and sweat resistance in sunscreens and makeup, so you don't have to reapply as often during swimming or exercise.
Cons and cautions
May feel tacky while drying
During the drying phase, some users notice a slight tackiness or stickiness, though this usually fades once fully dry.
Requires double cleansing
Because it forms a water-resistant film, it can be stubborn to remove with just water or a gentle cleanser—an oil-based cleanser or micellar water is often needed.
Best for
- People who want long-wearing makeup or water-resistant sunscreen
- Those with oily skin who need products that stay put
Use caution if
- People who prefer very lightweight, barely-there formulas and dislike any film feel
Usage tips
Safety summary
Cocoyl Adipic Acid/Trimethylolpropane Copolymer is considered safe for topical use in cosmetics. It has low irritation and comedogenic potential, and no significant safety concerns have been reported in the available literature.
Research notes
Safety assessments rely on analogy to similar film-forming polymers and the low reactivity of the ingredient. No specific human or animal studies were found, but the ingredient is widely used and accepted as safe by cosmetic safety panels.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. No known restrictions at typical use levels.
- Common uses
- Sunscreens, Waterproof makeup, Long-wear foundations, Hair styling products, Eye makeup
- Environmental note
- As a synthetic polymer, it is not biodegradable. However, it is used in low concentrations and is not known to bioaccumulate significantly.
Good to know
- This ingredient is often found in combination with other film formers to fine-tune the feel and durability of the final product.
- It is considered safe for use in cosmetics by major regulatory bodies when used as intended.
Common questions
What is Cocoyl Adipic Acid/Trimethylolpropane Copolymer in beauty products?
This ingredient is a polymer—a long chain of repeating molecules—made from coconut oil and adipic acid. When applied to skin or hair, it dries down into a thin, flexible film that helps other ingredients (like sunscreen or makeup) stay in place longer and resist water or sweat. It's often used in sunscreens to improve water resistance and in long-wear makeup to prevent smudging. Unlike some older film formers, it tends to feel lightweight and not overly tight or sticky.
What does Cocoyl Adipic Acid/Trimethylolpropane Copolymer do in a beauty product?
After application, the solvent (usually water or alcohol) evaporates, leaving behind a thin, continuous film on the skin or hair. This film physically locks in other ingredients (like sunscreen filters or pigments) and creates a barrier that resists water, sweat, and friction. The coconut-derived portion adds flexibility, so the film moves with the skin rather than cracking or feeling stiff.
Is Cocoyl Adipic Acid/Trimethylolpropane Copolymer safe for most people?
Cocoyl Adipic Acid/Trimethylolpropane Copolymer is considered safe for topical use in cosmetics. It has low irritation and comedogenic potential, and no significant safety concerns have been reported in the available literature.
Who should be careful with Cocoyl Adipic Acid/Trimethylolpropane Copolymer?
People who prefer very lightweight, barely-there formulas and dislike any film feel
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.