Ingredient review

Acrylates/Acetoacetoxyethyl Methacrylate Copolymer

INCI: ACRYLATES/ACETOACETOXYETHYL METHACRYLATE COPOLYMER

A synthetic film-former that helps makeup and sunscreen stay put longer, but offers no active skincare benefit.

beautyskincarefilm-former

In plain English

This is a plastic-like polymer that dries down to form a thin, flexible film on your skin. It's commonly used in long-wear makeup and water-resistant sunscreens to help them stay in place longer, even when you sweat or get wet. Think of it as a clear, invisible shield that locks your product onto your skin.

Quick decision guide

Useful, but context matters

Acrylates/Acetoacetoxyethyl Methacrylate 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 Acrylates/Acetoacetoxyethyl Methacrylate 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 made from acrylic acid derivatives. It is designed to create a durable, water-resistant film when applied to the skin.

How it works

When the product dries, the polymer molecules link together to form a continuous, flexible film. This film physically holds pigments and other ingredients in place, reducing transfer and improving water resistance.

Pros

Boosts wear time

Helps makeup and sunscreen stay intact for hours, even in humid or active conditions.

Water-resistant

Creates a barrier that resists water and sweat, making it ideal for outdoor or gym use.

Cons and cautions

Can feel drying

The film may create a tight sensation on dry or sensitive skin, especially if layered heavily.

Requires double cleansing

Because it forms a strong film, you may need an oil-based cleanser to remove it fully without irritation.

Best for

  • People who want long-wearing makeup or water-resistant sunscreen
  • Those with oily skin who struggle with makeup fading

Use caution if

  • Individuals with very dry or dehydrated skin who prefer hydrating, breathable formulas

Usage tips

Apply over a well-moisturized base to minimize any tight feeling.
Remove with an oil-based cleanser or micellar water to avoid tugging at the skin.
Use sparingly in areas prone to dryness, such as around the nose and mouth.

Safety summary

Considered safe for topical use at typical concentrations. Low irritation and comedogenic risk, though it may feel drying for some skin types. No known toxicity concerns in leave-on or rinse-off products.

Research notes

Limited independent safety studies, but the ingredient class (acrylates copolymers) has a long history of safe use in cosmetics. Regulatory bodies have not flagged significant concerns.

Common label clues

Typical concentration
1–10%
Regulatory status
Approved for use in cosmetics globally, including by the U.S. FDA and EU CosIng database, with no known restrictions at typical concentrations.
Common uses
Sunscreens, Long-wear foundations, Waterproof mascaras, Setting sprays
Environmental note
As a synthetic polymer, it is not biodegradable and may contribute to microplastic pollution. Some brands are moving toward bio-based alternatives.

Good to know

  • This ingredient is common in 'transfer-proof' and '24-hour wear' makeup claims.
  • It is not a preservative, fragrance, or active skincare ingredient.

Common questions

What is Acrylates/Acetoacetoxyethyl Methacrylate Copolymer in beauty products?

This is a plastic-like polymer that dries down to form a thin, flexible film on your skin. It's commonly used in long-wear makeup and water-resistant sunscreens to help them stay in place longer, even when you sweat or get wet. Think of it as a clear, invisible shield that locks your product onto your skin.

What does Acrylates/Acetoacetoxyethyl Methacrylate Copolymer do in a beauty product?

When the product dries, the polymer molecules link together to form a continuous, flexible film. This film physically holds pigments and other ingredients in place, reducing transfer and improving water resistance.

Is Acrylates/Acetoacetoxyethyl Methacrylate Copolymer safe for most people?

Considered safe for topical use at typical concentrations. Low irritation and comedogenic risk, though it may feel drying for some skin types. No known toxicity concerns in leave-on or rinse-off products.

Who should be careful with Acrylates/Acetoacetoxyethyl Methacrylate Copolymer?

Individuals with very dry or dehydrated skin who prefer hydrating, breathable formulas

Research sources

CosIng - EU Cosmetic Ingredient DatabaseOpenPersonal Care Council - Acrylates Copolymer SafetyOpenPubMed - Safety of Acrylate Polymers in CosmeticsOpen

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.