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HEMA/METHACRYLAMIDOPROPYLTRIMONIUM CHLORIDE/STYRENE COPOLYMER.

Valuable CAS - / OPACIFYING

This copolymer is designed to modulate product aesthetics and texture. Comprising hydrophilic HEMA, hydrophobic styrene, and cationic Methacrylamidopropyltrimonium Chloride, it primarily functions as an opacifying agent in cosmetic formulations, reducing transparency and enhancing product appearance.

Summary

Opacifying Agent Film-forming Agent Viscosity Increasing Agent

Science

Mechanism of Action

The HEMA/METHACRYLAMIDOPROPYLTRIMONIUM CHLORIDE/STYRENE COPOLYMER operates primarily as an opacifying agent by forming a dispersed phase that scatters light, thereby decreasing the transparency and translucency of cosmetic products. Its structure combines the hydrophilic properties of HEMA (2-hydroxyethyl methacrylate), allowing for water absorption and hydrogel formation, with the hydrophobic nature of styrene. The Methacrylamidopropyltrimonium Chloride component, a cationic monomer derived from MAPTAC, contributes strong electrostatic binding properties and adhesion enhancement. Beyond opacification, this copolymer, consistent with similar acrylate and styrene polymers, can also contribute to film formation and serve as a viscosity-increasing agent within formulations.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

This copolymer exhibits water solubility. The Methacrylamidopropyl Trimethyl Ammonium Chloride (MAPTAC) component is a water-soluble cationic monomer, and HEMA is a hydrophilic monomer. Research on a related polymer, Poly(3-methacrylamido propyl trimethyl ammonium chloride), indicates that its hydrolysis rate increases with elevated temperature and pH, suggesting enhanced stability in acidic to neutral pH environments. However, specific optimal pH ranges for this precise copolymer have not been detailed.

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Unknown

The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated broader categories encompassing the components of this copolymer, concluding HEMA, acrylates copolymers, and styrene and vinyl-type styrene copolymers as safe under current cosmetic use practices. While HEMA has a reported maximum use concentration of 79% in certain manicuring products, a specific maximum concentration for the HEMA/METHACRYLAMIDOPROPYLTRIMONIUM CHLORIDE/STYRENE COPOLYMER itself is not available from direct CIR or SCCS assessments. A structurally similar copolymer was referenced in a CIR draft report, but specific safety data was not incorporated due to an invalid CAS number.

Your Skin

Skin Compatibility

No Normal
No Dry
No Oily
No Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

This copolymer is a valuable ingredient for modifying cosmetic product aesthetics and texture, particularly for opacification; however, specific clinical efficacy data and a definitive maximum concentration for this exact copolymer are currently not available in direct safety assessments.

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