Ingredient review

Adipic Acid/Neopentyl Glycol/Trimellitic Anhydride Copolymer

INCI: ADIPIC ACID/NEOPENTYL GLYCOL/TRIMELLITIC ANHYDRIDE COPOLYMER

A synthetic polymer that helps makeup and skincare stay put longer without clogging pores.

beautyskincarefilm-former

In plain English

This is a man-made ingredient that forms a thin, flexible film on your skin. It helps makeup resist sweat, water, and rubbing, so your foundation or mascara lasts longer. Think of it like a clear, breathable shield that keeps the product in place without feeling heavy or sticky.

Quick decision guide

Useful, but context matters

Adipic Acid/Neopentyl Glycol/Trimellitic Anhydride 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Adipic Acid/Neopentyl Glycol/Trimellitic Anhydride Copolymer.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A synthetic copolymer created by reacting adipic acid, neopentyl glycol, and trimellitic anhydride. It belongs to the polyester family and is designed to be a non-oily, flexible film former.

How it works

When applied, the copolymer dries down to form a continuous, water-resistant film over the skin or lashes. This film locks in pigments and other ingredients, reducing transfer and smudging. It also helps control the viscosity of the product, giving it a smooth, spreadable texture.

Pros

Boosts makeup longevity

Creates a flexible film that helps foundation, mascara, and lip products resist sweat, water, and friction, so your look stays fresh longer.

Non-comedogenic

Unlikely to clog pores, making it suitable for acne-prone skin when used in appropriate concentrations.

Cons and cautions

Can feel drying over time

The film-forming nature may cause a slight tightness or dryness on already parched skin, especially if used in high concentrations.

Synthetic origin

As a petroleum-derived polymer, it may not appeal to those seeking natural or eco-conscious beauty routines.

Best for

  • Anyone wanting long-lasting makeup that survives humidity or activity
  • People with oily or combination skin who struggle with makeup sliding off

Use caution if

  • Those who prefer 100% natural or silicone-free formulas may want to check the full ingredient list

Usage tips

Apply a hydrating primer or moisturizer underneath products containing this polymer to avoid any tight feeling.
Use oil-based or micellar water cleansers for easy removal, as water alone may not fully dissolve the film.

Safety summary

Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic potential. No significant safety concerns reported in regulatory reviews.

Research notes

Limited independent studies on this specific copolymer, but it is structurally similar to other polyester film-formers that have a long history of safe use in cosmetics. Regulatory bodies like the Cosmetic Ingredient Review (CIR) have reviewed related polymers and found them safe as used.

Common label clues

Typical concentration
1% to 10%
Regulatory status
Approved for use in cosmetics in the EU, US, and many other regions. No known restrictions at typical use levels.
Common uses
Long-wear foundations, Waterproof mascaras, Lip products, Sunscreens
Environmental note
As a synthetic polymer, it is not biodegradable. However, it is used in small amounts and is not considered a major environmental concern compared to microplastics.

Good to know

  • This ingredient is often listed under the trade name Polyester-5 in some regions.
  • It is commonly used in waterproof and transfer-resistant formulas.

Common questions

What is Adipic Acid/Neopentyl Glycol/Trimellitic Anhydride Copolymer in beauty products?

This is a man-made ingredient that forms a thin, flexible film on your skin. It helps makeup resist sweat, water, and rubbing, so your foundation or mascara lasts longer. Think of it like a clear, breathable shield that keeps the product in place without feeling heavy or sticky.

What does Adipic Acid/Neopentyl Glycol/Trimellitic Anhydride Copolymer do in a beauty product?

When applied, the copolymer dries down to form a continuous, water-resistant film over the skin or lashes. This film locks in pigments and other ingredients, reducing transfer and smudging. It also helps control the viscosity of the product, giving it a smooth, spreadable texture.

Is Adipic Acid/Neopentyl Glycol/Trimellitic Anhydride Copolymer safe for most people?

Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic potential. No significant safety concerns reported in regulatory reviews.

Who should be careful with Adipic Acid/Neopentyl Glycol/Trimellitic Anhydride Copolymer?

Those who prefer 100% natural or silicone-free formulas may want to check the full ingredient list

Research sources

Cosmetic Ingredient Review (CIR) - Safety of Polyester PolymersOpenPubChem - Adipic AcidOpenEuropean Chemicals Agency (ECHA) - Neopentyl GlycolOpen

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.