Acrylates Copolymer is a synthetic polymer that functions as a film-former, suspension agent, and texture enhancer. This ingredient provides essential structural integrity to cosmetics, enabling water resistance in sunscreens and stabilizing insoluble particles in exfoliating cleansers.
- INCI Name:
- Acrylates Copolymer
- Chemical/Scientific Name:
- Ethyl acrylate, methyl methacrylate, and methacrylic acid polymer
- Common Aliases:
- Acrylic acid copolymer, film-forming polymer, carbomer-type copolymer
| Category: | Texture Enhancers |
| Source Origin: | Synthetic |
| Comedogenic Rating: | 0 |
| Primary Industries: | Cosmetics, Hair Care, Personal Care |
| Solubility: | Water-dispersible (pH dependent) |
At a Glance: Properties & Effects
| Texture Enhancement | |
| Formula Stability | |
| Irritation Risk |
- Primary Benefits: Creates a uniform film on skin and hair, provides water and rub resistance, stabilizes pigments and exfoliants, and imparts a smooth skin feel.
- Potential Risks: Low irritation risk, though sensitivity to residual monomers can occur in extremely rare cases; potential for “pilling” if used at excessive concentrations.
Biological Action & Cosmetic Profile
High molecular weight prevents Acrylates Copolymer from penetrating the skin barrier. Because the polymer chains are too large to pass through the stratum corneum, the ingredient remains on the surface to perform its mechanical functions. Once applied to the skin, the polymer forms a flexible, cohesive, and continuous film. This film serves as a matrix that holds other active ingredients, such as Titanium Dioxide or Zinc Oxide, in place, ensuring even coverage and enhancing the efficacy of UV protection.Rheological properties of the formulation are significantly altered by the addition of this copolymer. In aqueous solutions, the polymer chains uncoil upon neutralization—often using agents like Sodium Hydroxide—which increases the viscosity of the Aqua phase. This thickening effect allows formulators to suspend heavy particles, such as Silica or beads, without the particles settling to the bottom of the container. Film-forming capabilities extend to hair care, where the polymer wraps around the hair shaft. This coating provides “hold” in styling products by creating bridges between hair fibers. Unlike some traditional resins, modern Acrylates Copolymers are designed to be flexible, reducing the “crunchy” feel while maintaining resistance to high humidity.
Broader Applications & Origins
Synthetic synthesis via free-radical polymerization allows for precise control over the polymer’s final characteristics. By adjusting the ratio of monomers like methacrylic acid and methyl methacrylate, manufacturers can tailor the polymer to be either alkali-soluble or hydrophobic. These variations dictate whether the ingredient will be used in a clear hair gel or a heavy-duty waterproof mascara. Long-wear makeup relies heavily on these polymers to resist smudging. The film formed by the copolymer is resistant to both Aqua and sebum, which helps pigments adhere to the skin for extended periods. In sunscreens, the inclusion of this polymer is the primary mechanism behind “water-resistant” labeling, as it prevents the UV filters from being easily rinsed away.
Routine Integration
- Synergies: Combines effectively with Glycerin to offset potential dryness from film-formers; works ideally with inorganic sunscreens and pigmented color cosmetics to ensure even distribution.
- Conflicts: High electrolyte or salt concentrations can destabilize the polymer network, leading to a sudden loss of viscosity or “breaking” of the emulsion.
Clinical Consensus & Safety
Dermatological assessments by the Cosmetic Ingredient Review (CIR) Expert Panel concluded that Acrylates Copolymers are safe for use in cosmetic formulations. Their 2002 safety report, reaffirmed in 2018, noted that these polymers are non-sensitizing and non-irritating to the skin and eyes at typical use concentrations. Because they are not absorbed into the systemic circulation, there is no risk of internal toxicity. Most clinical concerns regarding “acrylates” pertain to the monomer form (used in professional nail gels); however, the polymerized version used in skincare is chemically stable and inert.
Is Acrylates Copolymer considered a microplastic?
Current regulatory definitions often distinguish between solid, insoluble plastic particles (microbeads) and liquid or water-dispersed polymers. Acrylates Copolymer used in skincare is typically a liquid or a dissolved polymer, meaning it does not persist in the environment in the same physical form as traditional plastic microbeads.
Will this ingredient cause my skincare to pill?
Pilling can occur if a product contains a high concentration of film-forming polymers that do not fully adhere to the skin. This usually happens if the product is applied over an oily base or if too much product is used, causing the polymer film to roll up into small balls when rubbed.
Is it safe for sensitive or acne-prone skin?
Acrylates Copolymer is non-comedogenic and does not clog pores due to its large molecular size. It is generally well-tolerated by sensitive skin, as it sits inertly on the surface without interacting with live skin cells.