Amp-Acrylates/Allyl Methacrylate Copolymer: What Is It, Cosmetic Uses, Benefits & Side Effects

Curious about this ingredient? In this article we're explaining exactly what it is and why it's used within cosmetic formulations.
Updated on: June 23, 2025
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All information on this page is verified using publicly available nomenclature standards and reference materials from The Personal Care Products Council (PCPC) and the European Commission's CosIng database. Our analyses are based on technical data from these sources to ensure accuracy and reliability.

What Is Amp-Acrylates/Allyl Methacrylate Copolymer?

Amp-Acrylates/Allyl Methacrylate Copolymer is a synthetic polymer created by combining allyl methacrylate with acrylic acid, methacrylic acid or their simple esters, then neutralizing the resulting chain with aminomethylpropanol. The finished material is a white to off-white powder that disperses in water to form a flexible film once it dries.

Polymers that form clear films have been explored since the 1950s to improve the hold of hair sprays and the durability of makeup. As aerosol technology and water-based styling products gained popularity in the 1970s formulators looked for ingredients that could deliver strong yet brushable hold without flaking. Amp-Acrylates/Allyl Methacrylate Copolymer emerged from that search thanks to its balanced rigidity and flexibility.

Manufacturing starts with a controlled free-radical polymerization of the chosen monomers. The growing chains are capped to keep molecular weight within a target range, then the slurry is neutralized with aminomethylpropanol, filtered, dried and milled. The neutralization step makes the polymer readily dispersible in water, which simplifies large-scale production of sprays, gels and creams.

You will most often find this copolymer in aerosol and pump hair sprays, styling gels, mousse, setting lotions, brow gels, mascaras, long-wear eyeliners, transfer-resistant foundations and certain peel-off face masks. Its transparent film adds hold, shine and resistance to humidity without feeling stiff.

Amp-Acrylates/Allyl Methacrylate Copolymer’s Cosmetic Benefits/Uses

This ingredient earns its spot on an ingredient list by giving formulas reliable hold and a smooth finish.

  • Film forming – creates an invisible layer on hair or skin that locks other ingredients in place, boosts water resistance and adds a light sheen so makeup and styling products last longer
  • Hair fixing – delivers flexible yet lasting hold in sprays, gels and mousses helping styles stay defined even in high humidity while allowing hair to remain touchable and easy to brush out

Who Can Use Amp-Acrylates/Allyl Methacrylate Copolymer

Because it is an inert film former that stays mostly on the surface, this copolymer suits oily, combination, normal and dry skin alike. Extremely sensitive or eczema-prone skin might prefer to avoid it if past experience shows a dislike for synthetic polymers, but most people tolerate it well.

The material is manufactured entirely from petrochemical or plant-derived monomers and an amine neutralizer so it contains no animal by-products. That makes it suitable for vegans and vegetarians.

No studies show that the polymer penetrates skin or interferes with hormones, so products containing it are generally considered safe during pregnancy and breastfeeding. This is not medical advice and anyone who is pregnant or nursing should review all personal care products with a healthcare professional just to be safe.

Amp-Acrylates/Allyl Methacrylate Copolymer does not make skin more sensitive to sunlight and it will not reduce the effectiveness of sunscreen in a formula. It is also odorless and free of known allergens such as gluten, soy and nuts, which can be helpful for users managing those concerns.

Potential Side Effects/Adverse Reactions

Side effects and reactions to the topical application of Amp-Acrylates/Allyl Methacrylate Copolymer can vary from person to person. The following is a list of potential side effects that are possible yet unlikely for most users as long as the ingredient has been formulated correctly.

  • Mild skin redness or itching especially on very sensitive or compromised skin
  • Contact dermatitis in rare cases where an individual is allergic to acrylic polymers
  • Eye irritation if aerosol sprays or loose powder drift into the eyes during application
  • Hair stiffness or dullness when high concentrations are left to build up without proper cleansing
  • Flaking or white residue if the product is overapplied or exposed to extreme humidity changes

If any irritation or discomfort occurs discontinue use and consult a qualified healthcare professional or dermatologist.

Comedogenic Rating

Rating: 1/5. Amp-Acrylates/Allyl Methacrylate Copolymer is a large water-dispersible molecule that stays on the surface of skin and contains no oily or waxy ingredients, so it is very unlikely to clog pores. A light breathable film still has a slim chance of trapping sebum if heavy layers are left on for days, which keeps the score from being a perfect zero.

The ingredient is generally suitable for acne-prone or breakout-prone users.

Regular cleansing at the end of the day will prevent any buildup that could contribute to congestion over time.

Summary

Amp-Acrylates/Allyl Methacrylate Copolymer shines as a clear flexible film former and hair fixer. When the water phase evaporates its polymer network locks makeup and hairstyles in place, giving hold, gloss and humidity resistance while letting hair remain touchable and makeup feel light.

It is not a headline grabbing skincare superstar but it quietly supports countless everyday products such as hair sprays, gels and brow stylers along with long wear foundations and mascaras. Brands appreciate its reliability, ease of use and cost effectiveness.

Research shows it is non irritating, non sensitizing and does not penetrate live skin so adverse reactions are rare. Still, every skin type is unique. Patch test any new product that contains this ingredient to be sure it agrees with you.

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