Characterized by its unique “shape-memory” properties, this high-performance polymer creates elegant, self-leveling gel textures that instantly return to a smooth surface after use. It functions primarily as a non-ionic associative thickener that stabilizes emulsions while providing a luxurious, non-sticky skin feel.
- INCI Name:
- PEG-240/HDI Copolymer Bis-Decyltetradeceth-20 Ether
- Chemical/Scientific Name:
- Hexamethylene diisocyanate (HDI) polymer with polyethylene glycol and decyltetradeceth ether
- Common Aliases:
- HEUR Polymer, Adeka Nol GT-700
| Category: | Thickeners |
| Source Origin: | Synthetic |
| Comedogenic Rating: | 0 |
| Primary Industries: | Skincare, Cosmetics, Personal Care |
| Solubility: | Water-soluble |
At a Glance: Properties & Effects
| Texture Enhancement: | |
| Formula Stability: | |
| Penetration Enhancement: | |
| Irritation Risk: |
- Primary Benefits:
- Creates “memory” gels that maintain a perfectly smooth surface in the jar.
- Provides a high degree of viscosity without the tackiness often associated with Glycerin or gums.
- Supports the stability of oil-in-water emulsions by creating a structural network.
- Delivers a refreshing, watery sensation upon application to the skin.
- Potential Risks:
- Extremely low risk; generally considered biologically inert due to its high molecular weight.
- Poor compatibility with very high concentrations of certain electrolytes.
Biological Action & Cosmetic Profile
Unlike traditional Carbomer thickeners that rely on pH neutralization and charge repulsion, this ingredient belongs to the Hydrophobically Modified Ethoxylated Urethane (HEUR) class. Its architecture consists of a hydrophilic PEG backbone terminated with hydrophobic decyltetradecyl groups. In an aqueous solution such as Aqua, these hydrophobic ends seek each other out to form a reversible micellar network. This physical cross-linking gives the product viscoelastic properties, allowing a formula to flow like a liquid under pressure (shear-thinning) but act like a solid at rest.Molecular interaction within the formula is what generates the famed “shape-memory” effect. When a consumer scoops product from a jar, the network is temporarily disrupted. Once the stress is removed, the hydrophobic “anchors” re-associate rapidly, pulling the gel back into its original, flat state. This functionality is highly prized in premium “bouncy” sleeping masks and water-drop creams where aesthetic presentation is paramount.The polymer additionally functions as a co-emulsifier. By associating with the surface of oil droplets in an emulsion, the hydrophobic segments help lock those droplets in place within the aqueous matrix. This reduces the likelihood of coalescence and phase separation, even in formulas with high concentrations of emollients or active botanical extracts.
Broader Applications & Origins
While primarily utilized in high-end skincare, this copolymer is frequently found in “water-gel” sunscreens and lightweight moisturizers. Its synthetic origin allows for high purity and consistency compared to natural gums like Xanthan Gum, which can sometimes vary in clarity or odor. Because it is non-ionic, it remains stable across a wide pH range, making it a versatile tool for chemists formulating everything from acidic vitamin C serums to neutral hydrating fluids.
Routine Integration
- Synergies:
- Humectants: Pairs exceptionally well with Sodium Hyaluronate and Propanediol to create “cushion” during application.
- Skin Replenishers: Often found in formulas containing Squalane or Ceramide Np to stabilize the lipid phase.
- Conflicts:
- High Salts: Formulations with very high levels of electrolytes (like certain mineral salts) may slightly weaken the associative network, though it is far more resilient than polyacrylate-based thickeners.
Clinical Consensus & Safety
Dermatological safety assessments by the Cosmetic Ingredient Review (CIR) Expert Panel have evaluated PEG/HDI copolymers and determined them to be safe for use in cosmetic formulations. The large molecular weight of the polymer effectively prevents percutaneous absorption, meaning it sits on the skin’s surface without entering the bloodstream or causing systemic toxicity. It is non-sensitizing and non-irritating even at the higher concentrations typically used to achieve a gel-to-liquid break.
Is this ingredient considered a microplastic?
No. Under current regulatory definitions by the ECHA, water-soluble polymers like this copolymer do not fall under the restricted “solid microplastic” category as they exist in a liquid or dissolved state within the formulation and do not persist as solid particles in the environment.
Does it clog pores or cause acne?
No. The polymer is non-comedogenic. It creates a breathable, non-occlusive film on the skin that does not interfere with sebum flow, making it ideal for oily and acne-prone skin types.
Why is it used in “anti-aging” creams?
While it does not have direct biological anti-aging effects like Retinol, it provides an immediate “blurring” and smoothing effect on the skin surface. The film it forms can temporarily minimize the appearance of fine lines by improving light reflection.