This multi-functional synthetic polymer serves as a high-performance thickening agent, emulsifier, and stabilizer in cosmetic formulations. It is specifically prized for creating “melting” textures that break upon skin contact to deliver a refreshing, non-greasy sensory experience.
- INCI Name:
- Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
- Chemical/Scientific Name:
- 2-Propenoic acid, 2-hydroxyethyl ester, polymer with 2-methyl-2-((1-oxo-2-propenyl)amino)-1-propanesulfonic acid monosodium salt
- Common Aliases:
- HEA/Sodium Acryloyldimethyl Taurate Copolymer, Simulgel NS (when blended)
| Category: | Texture Enhancers |
| Source Origin: | Synthetic |
| Comedogenic Rating: | 0 |
| Primary Industries: | Skincare, Haircare, Color Cosmetics |
| Solubility: | Water-dispersible |
At a Glance: Properties & Effects
| Texture Enhancement: | |
| Formula Stability: | |
| Irritation Risk: |
Primary Benefits:
- Creates elegant, lightweight textures that lack the stickiness associated with traditional natural gums.
- Provides superior stabilization for oil-in-water emulsions, even at low concentrations.
- Offers a “quick-break” effect, where the gel structure collapses upon skin contact to release water and active ingredients.
- Functions effectively across a broad pH range (typically 3.0 to 12.0), making it compatible with acidic actives.
Potential Risks:
- Sensitivity to high concentrations of electrolytes (salts), which can reduce the viscosity of the gel network.
- Minimal risk of contact dermatitis, though it is considered non-sensitizing for the vast majority of users.
Biological Action & Cosmetic Profile
As a pre-neutralized liquid polymer, this substance functions primarily through the creation of a micro-gel network within the aqueous phase of a formula. Unlike traditional carbomers that require a separate neutralization step with a base like Sodium Hydroxide or Triethanolamine, this copolymer is ready to use and swells instantly in water. Its structural backbone consists of both hydrophilic and hydrophobic segments, allowing it to anchor oil droplets in place and prevent phase separation in emulsions.The sensory profile of this ingredient is distinct from other thickeners like Xanthan Gum. While natural gums can sometimes feel “filmy” or tacky, this synthetic copolymer leaves a velvet-like finish on the skin. It possesses an inherent ability to emulsify high percentages of oils (up to 40% in some commercial blends) without the need for additional traditional surfactants, which can often be irritating to compromised skin barriers.Molecular weight plays a crucial role in its performance. Because the polymer chains are large, they do not penetrate the stratum corneum. Instead, they remain on the skin surface to modulate the evaporation of water, indirectly supporting the efficacy of humectants like Glycerin. This topical film-forming ability also helps to smooth the skin’s microrelief, providing an immediate perceived improvement in skin texture.
Broader Applications & Origins
Formulators frequently utilize this copolymer in “gel-cream” or “water-drop” products where a high water content needs to be stabilized alongside lightweight lipids like Squalane or Isohexadecane. In the manufacturing process, it is often supplied as a concentrated inverse emulsion, frequently paired with Polysorbate 60 and Sorbitan Isostearate to enhance its dispersibility and emulsifying power. Beyond simple hydration, its shear-thinning behavior ensures that sunscreens containing Titanium Dioxide spread evenly without clumping or streaking.
Routine Integration
Synergies:
- Emollients: Works exceptionally well with Caprylic Capric Triglyceride and Dimethicone to create silky, spreadable lotions.
- Humectants: Enhances the skin feel of Panthenol and Sodium Hyaluronate by reducing the “tack” often found in high-concentration serums.
- Acidic Actives: Maintains stability in the presence of Ascorbic Acid or Glycolic Acid where other thickeners might fail.
Conflicts:
- High Salt Content: Formulations containing high levels of sodium chloride or certain mineral extracts may cause the polymer to “lose its grip,” resulting in a watery consistency.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel evaluated this copolymer in 2017 and concluded it is safe for use in cosmetics in the present practices of use and concentration. Clinical data indicates that the ingredient is non-irritating and non-sensitizing at concentrations typically found in leave-on products (usually between 0.5% and 3%). Because of its high molecular weight, it lacks the potential for systemic absorption, and it is not considered comedogenic or acnegenic. Dermatological testing via patch tests consistently shows a high degree of skin compatibility, even for individuals with sensitive skin types.
Is this ingredient a microplastic?
While it is a synthetic polymer, it is typically used in liquid or gel form and does not fall under the specific “microplastic microbead” bans targeting solid, exfoliating particles. However, as a synthetic polymer, its environmental biodegradability is lower than natural gums.
Why is my moisturizer watery if it contains this?
This often occurs if the product is stored in extreme heat or if it contains high levels of electrolytes (salts) which can disrupt the polymer’s gel structure over time.
Is it safe for fungal acne (Malassezia Folliculitis)?
The copolymer itself is safe; however, it is frequently sold in commercial blends that contain Polysorbate 60 or Sorbitan Isostearate, which are esters that can potentially trigger fungal acne.