Ingredient review
Adipic Acid/Diethylenetriamine Copolymer
INCI: ADIPIC ACID/DIETHYLENETRIAMINE COPOLYMER
A synthetic polymer that helps products stay put longer, especially in water-resistant sunscreens and long-wear makeup.
In plain English
This is a man-made ingredient that creates a thin, invisible film on your skin. It helps other ingredients—like sunscreen or foundation—stay in place longer, even when you sweat or get wet. Think of it like a gentle glue that holds your skincare or makeup together without feeling heavy.
Quick decision guide
Useful, but context matters
Adipic Acid/Diethylenetriamine 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 Adipic Acid/Diethylenetriamine 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 synthetic copolymer formed from adipic acid and diethylenetriamine. It is designed to form a flexible, water-resistant film on the skin.
How it works
When applied, the polymer molecules link together to form a continuous, breathable film on the skin's surface. This film helps lock in other ingredients and resists being washed away by water or sweat.
Pros
Boosts water resistance
Helps sunscreens and makeup stay effective even when you sweat or swim, so you don't have to reapply as often.
Extends wear time
Creates a flexible film that keeps foundation or tinted moisturizer in place for hours without smudging.
Cons and cautions
May feel tacky
On some skin types, especially in humid weather, the film can feel slightly sticky or heavy.
Not biodegradable
As a synthetic polymer, it does not break down easily in the environment, which is a concern for eco-conscious users.
Best for
- People who want long-wearing makeup or water-resistant sunscreen
- Those with normal to oily skin who prefer products that stay put
Use caution if
- Individuals with very sensitive skin who react to film-forming ingredients
- Those who prefer fully biodegradable or natural formulations
Usage tips
Safety summary
Generally recognized as safe for topical use in cosmetics. Low irritation and comedogenic potential. No significant safety concerns at typical concentrations.
Research notes
Limited independent research on this specific copolymer, but film-forming polymers as a class are well-studied for safety and efficacy in cosmetic applications. Regulatory reviews support its safe use.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US (FDA), EU (CosIng), and many other regions. No known restrictions at typical use levels.
- Common uses
- Sunscreens, Waterproof makeup, Long-wear foundations
- Environmental note
- As a synthetic polymer, it is not readily biodegradable. Some manufacturers are exploring bio-based alternatives to reduce environmental impact.
Good to know
- This polymer is often combined with other film-formers to fine-tune the feel and durability of a product.
- It is considered safe for use in cosmetics by major regulatory bodies when used as directed.
Common questions
What is Adipic Acid/Diethylenetriamine Copolymer in beauty products?
This is a man-made ingredient that creates a thin, invisible film on your skin. It helps other ingredients—like sunscreen or foundation—stay in place longer, even when you sweat or get wet. Think of it like a gentle glue that holds your skincare or makeup together without feeling heavy.
What does Adipic Acid/Diethylenetriamine Copolymer do in a beauty product?
When applied, the polymer molecules link together to form a continuous, breathable film on the skin's surface. This film helps lock in other ingredients and resists being washed away by water or sweat.
Is Adipic Acid/Diethylenetriamine Copolymer safe for most people?
Generally recognized as safe for topical use in cosmetics. Low irritation and comedogenic potential. No significant safety concerns at typical concentrations.
Who should be careful with Adipic Acid/Diethylenetriamine Copolymer?
Individuals with very sensitive skin who react to film-forming ingredients Those who prefer fully biodegradable or natural formulations
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.