Acrylates/C10-30 Alkyl Acrylates Crosspolymer is a versatile rheology modifier used to create crystal-clear gels and stabilize complex emulsions. It excels at thickening formulas containing high levels of electrolytes or oils, providing a smooth, non-tacky skin feel.
- INCI Name:
- Acrylates/C10-30 Alkyl Acrylates Crosspolymer
- Chemical/Scientific Name:
- C10-30 Alkyl Propenoate, polymer with propenoic acid, and/or alkyl propenoates, product with ether of pentaerythritol
- Common Aliases:
- Hydrophobically modified carbomer, Alkyl acrylate crosspolymer
| Category: | Thickeners |
| Source Origin: | Synthetic |
| Comedogenic Rating: | 0 |
| Primary Industries: | Cosmetics, Dermatology, Personal Care |
| Solubility: | Water-dispersible (swells upon neutralization) |
At a Glance: Properties & Effects
| Texture Enhancement: | |
| Formula Stability: | |
| Irritation Risk: |
- Primary Benefits: Exceptional thickening, emulsion stabilization, salt/electrolyte tolerance, and elegant sensory profile.
- Potential Risks: Minimal; rare instances of mild eye irritation if used at extremely high concentrations in raw form.
Biological Action & Cosmetic Profile
This high-molecular-weight polymer functions as a cross-linked polyacrylic acid, modified with hydrophobic alkyl chains. While standard carbomers struggle in the presence of salts, the C10-30 alkyl modification allows this molecule to maintain viscosity in more demanding environments. The dual-nature structure—containing both hydrophilic and lipophilic regions—enables it to act as a primary emulsifier in “oil-in-water” systems, effectively suspending oil droplets within an aqueous matrix without the need for traditional surfactants.
Developing a stable gel network requires the neutralization of the polymer’s acidic groups. When a base such as Sodium Hydroxide, Potassium Hydroxide, Triethanolamine, or Aminomethyl Propanol is added, the polymer chains uncoil and swell. This physical expansion creates the characteristic “yield value” of the gel, which is responsible for keeping heavy particles or oil beads perfectly suspended throughout the product’s shelf life.
Sensory characteristics remain a primary reason for its widespread use in modern skincare. Unlike some natural gums that can feel “stringy” or “snotty,” this crosspolymer provides a “short flow” rheology, meaning the product breaks cleanly and spreads easily across the skin. It lacks the heavy, sticky residue often associated with traditional emulsifying waxes, making it ideal for lightweight serums, sunscreens, and gel-creams.
Broader Applications & Origins
Beyond simple thickening, this ingredient is a staple in “water-break” technology. In these formulations, the polymer network collapses upon contact with the salts naturally present on the skin’s surface, instantly releasing Aqua and active ingredients for a refreshing, cooling sensation. Its synthetic origin ensures high purity and batch-to-batch consistency, which is often difficult to achieve with bio-derived thickeners like Xanthan Gum.
Routine Integration
- Synergies: Pairs excellently with humectants like Glycerin and Panthenol to improve spreadability and skin hydration.
- Conflicts: High concentrations of mineral salts or highly acidic actives (below pH 4.0) may reduce the thickening efficiency, though it is more resilient than standard carbomer.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel has repeatedly evaluated this polymer, concluding it is safe for use in cosmetic formulations. Clinical data indicates it is non-sensitizing and non-irritating to the skin, even at concentrations significantly higher than those typically found in consumer products. Because of its large molecular size, the polymer cannot penetrate the skin barrier, further ensuring its safety profile is limited to the skin’s surface.
Is this ingredient a microplastic?
While it is a synthetic polymer, Acrylates/C10-30 Alkyl Acrylates Crosspolymer is typically classified as a liquid or gel-state polymer rather than a solid plastic microbead. However, regulatory definitions of “microplastics” vary by region and are currently under evolving scrutiny in the EU.
Does it cause acne or clogged pores?
No, this ingredient has a comedogenic rating of 0. It is a non-occlusive, inert molecule that does not interact with sebum production or follicular keratinization.
Why does my gel-cream “pill” when I apply it?
Pilling can occur if the polymer is used at very high concentrations or if it interacts with other film-formers (like silicones) in your routine. This is usually a mechanical issue of the product drying too quickly or being layered over incompatible formulas, rather than a safety concern.