Glycerin Acrylate/Acrylic Acid Copolymer is a high-performance humectant and film-forming agent that creates a molecular clathrate to trap moisture on the skin surface. It is primarily utilized to provide a long-lasting cooling sensation and a “water-break” sensory effect in lightweight gels and serums.
- INCI Name:
- Glyceryl Acrylate/Acrylic Acid Copolymer
- Chemical/Scientific Name:
- 2-Propenoic acid, polymer with 1,2,3-propanetriol 2-propenoate
- Common Aliases:
- Lubrajel, Glyceryl Polymethacrylate (related), Polyacrylic Acid/Glycerin Copolymer
| Category: | Moisturizers |
| Source Origin: | Synthetic |
| Comedogenic Rating: | 0 |
| Primary Industries: | Cosmetics, Pharmaceuticals (topical drug delivery) |
| Solubility: | Water-soluble |
At a Glance: Properties & Effects
| Hydration/Moisture: | |
| Texture Enhancement: | |
| Irritation Risk: |
- Primary Benefits:
- Sustained release of moisture through a polymeric lattice.
- Reduces the inherent tackiness often associated with high concentrations of Glycerin.
- Creates a breathable film that limits transepidermal water loss (TEWL).
- Potential Risks:
- Minimal; highly bio-inert and non-sensitizing for most skin types.
Biological Action & Cosmetic Profile
The functional core of this copolymer lies in its ability to form a clathrate, or a physical “cage” structure, that encapsulates Aqua and Glycerin molecules. Unlike simple humectants that may evaporate or absorb quickly, this polymeric matrix stays on the skin surface, slowly releasing its bound moisture over several hours. This mechanism provides a significant advantage for damaged skin barriers, as it maintains a high local humidity at the stratum corneum without the occlusion of heavy oils or petrolatum.The inclusion of acrylic acid units within the chain allows the polymer to interact with the skin’s natural moisture. When the gel is applied, the friction and change in salt concentration on the skin surface cause the “cage” to partially collapse, leading to the characteristic “slip” and immediate cooling effect. This makes it an ideal candidate for after-sun products or soothing “water-drop” creams. Additionally, its film-forming properties help stabilize other water-soluble actives, ensuring they remain distributed evenly across the skin.Formulators value this ingredient for its rheological properties. While a Carbomer might provide thickness, this copolymer provides a specific “stringy” or “lubricious” viscosity that mimics the feel of high-end clinical lubricants. It is highly compatible with other polyols like Butylene Glycol, though its viscosity can be sensitive to high concentrations of electrolytes or extremely low pH environments.
Routine Integration
- Synergies:
- Humectant Boosters: Highly effective when paired with Sodium Hyaluronate to provide multi-level hydration.
- Soothing Agents: Works well with Panthenol or Allantoin to calm irritated or inflamed skin.
- Solvents: Often formulated alongside Propylene Glycol to enhance penetration of accompanying active substances.
Clinical Consensus & Safety
Dermatological assessments conducted by the Cosmetic Ingredient Review (CIR) Expert Panel categorize acrylates copolymers as safe for cosmetic use. Because these are large-weight polymers, they do not penetrate the viable layers of the skin, significantly reducing the risk of systemic toxicity. Clinical trials for trade-named versions of this ingredient show no evidence of phototoxicity or contact sensitization even at 100% concentration, though cosmetic use levels typically range from 1% to 10% in the final formulation.
Is this ingredient a microplastic?
While it is a synthetic polymer, Glycerin Acrylate/Acrylic Acid Copolymer is typically used in a liquid or gel form and is water-swellable rather than a solid, persistent plastic particle. It does not fall under the standard definition of “microbeads” used in rinse-off products.
Can this cause breakouts?
No, this ingredient has a comedogenic rating of 0. It is water-based and non-occlusive, making it safe for acne-prone and oily skin types that require hydration without heavy lipids.