This synthetic polymer serves as a high-performance thickening and stabilizing agent, prized for its ability to create “quick-break” gel textures that melt into a watery consistency upon skin contact. By combining water-loving and oil-loving properties, it enables the creation of stable, elegant emulsions without the need for traditional heavy surfactants.
- INCI Name:
- Acrylates/C10-30 Alkyl Acrylate Crosspolymer
- Chemical/Scientific Name:
- C10-30 alkyl acrylate crosspolymer
- Common Aliases:
- Hydrophobically modified carbomer, Polymeric emulsifier
| Category: | Thickeners |
| Source Origin: | Synthetic |
| Comedogenic Rating: | 0 |
| Primary Industries: | Skincare, Sun Care, Haircare |
| Solubility: | Water-dispersible (Swells upon neutralization) |
At a Glance: Properties & Effects
| Texture Enhancement | |
| Formula Stability | |
| Skin Soothing | |
| Irritation Risk |
- Primary Benefits:
- Creates lightweight, non-greasy textures in creams and gels.
- Stabilizes complex oil-in-water emulsions with minimal surfactants.
- Provides a “quick-break” sensory experience, releasing Aqua and actives instantly upon application.
- Improves the spreadability and “slip” of cosmetic formulations.
- Potential Risks:
- Incompatible with high concentrations of electrolytes (salts).
- Requires precise pH neutralization to achieve desired viscosity.
Biological Action & Cosmetic Profile
This molecule is a hydrophobically modified version of the standard Carbomer. Structurally, it consists of a backbone of acrylic acid cross-linked with long-chain C10-30 alkyl acrylates. These alkyl “tails” allow the polymer to function as a polymeric emulsifier by anchoring into the oil droplets of an emulsion while the hydrophilic backbone remains in the water phase. This dual nature creates a robust physical network that prevents oil droplets from coalescing, ensuring long-term product stability even at low concentrations.
The thickening mechanism depends heavily on a process called neutralization. In its raw powder state, the polymer chains are tightly coiled. When dispersed in Aqua and treated with a base—such as Sodium Hydroxide, Potassium Hydroxide, or Triethanolamine—the acid groups on the polymer backbone ionize. This creates negative charges that repel each other, causing the polymer to uncoil and swell into a three-dimensional gel matrix. This network effectively traps water and oils, resulting in the smooth, high-viscosity textures found in modern skincare.
Broader Applications & Origins
Formulators often select this ingredient over traditional thickeners when creating products for sensitive or oily skin. Because it can stabilize oils without high levels of traditional surfactants, it reduces the risk of barrier disruption associated with emulsifying agents. It is frequently utilized in sunscreens to ensure a uniform film of UV filters on the skin, and in “water-drop” creams where a sudden release of moisture is desired. While synthetic in origin, the polymer is designed to be inert, remaining on the skin surface as a breathable film without penetrating the deeper epidermal layers.
Routine Integration
- Synergies:
- Humectants: Works seamlessly with Glycerin and hyaluronic acid to provide a hydrated skin feel.
- Silicones: Often paired with Dimethicone to create silky, primer-like finishes.
- Solvents: Stable in the presence of Alcohol Denat, making it ideal for cooling gel formulations.
- Conflicts:
- Electrolytes: High levels of salts (e.g., sodium chloride or certain mineral extracts) can collapse the gel network, causing the product to thin or separate.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel concluded in their 2017 amended assessment that Acrylates/C10-30 Alkyl Acrylate Crosspolymer is safe for use in cosmetics at current concentrations, provided it is not polymerized in benzene. Clinical audits, including those by the British Society for Cutaneous Allergy, indicate that sensitization to this polymer is extremely rare. It is considered non-comedogenic and non-irritating, making it suitable for all skin types, including acne-prone and sensitive profiles. Peer-reviewed studies in International Journal of Toxicology emphasize its lack of systemic absorption and minimal potential for dermal toxicity.
Is this ingredient a microplastic?
While it is a synthetic polymer, it is typically classified as a “liquid plastic” or soluble polymer. Unlike solid plastic microbeads, it does not exist as persistent particles in the environment in the same way, though regulatory definitions regarding liquid polymers continue to evolve globally.
How does it differ from a standard carbomer?
Standard Carbomer is purely water-loving and primarily thickens the water phase. The C10-30 version contains hydrophobic alkyl chains, allowing it to interact directly with oils, making it much more effective at stabilizing emulsions and handling higher oil loads.
Does it clog pores?
No. Due to its large molecular weight and film-forming nature, it does not penetrate the pores or the skin barrier. It remains on the surface and has a comedogenic rating of 0.