MA-AA Na Copolymer (Sodium Methacrylate/Acrylate Copolymer)

MA-AA Na Copolymer – Sodium Methacrylate/Acrylate Copolymer for Cosmetics and Personal Care

Chemical Structure and Synthesis
MA-AA Na is a sodium salt copolymer produced by free‑radical copolymerization of methacrylic acid and acrylic acid monomers, followed by neutralization with sodium hydroxide. The resulting polymer structure can be represented as:
[–CH₂–C(CH₃)(COONa)–CH₂–CH(COONa)–]ₙ
The combination of methacrylate and acrylate units provides a balance between lipophilic (hydrophobic) and hydrophilic (water‑soluble) properties, making it a versatile ingredient in aqueous and emulsion systems.

Physicochemical Properties

• Film‑forming ability: Forms elastic, transparent films on skin and hair, providing hold, smoothness, and protection.

• Thickening effect: Significantly increases viscosity in aqueous systems, enabling the creation of gels and stabilized emulsions.

• Emulsion stabilization: Improves the homogeneity and stability of emulsions, preventing phase separation.

• Compatibility: Compatible with a wide range of cosmetic ingredients, including surfactants, oils, and active compounds.

• pH sensitivity: Typically effective in the pH range of 5–8.

• Water solubility: Readily soluble in water, facilitating easy incorporation into formulations.

Applications

• Hair styling: Shampoos, conditioners, gels, mousses, and sprays – provides hold, elasticity, and shine; improves curl definition and reduces static.

• Skin care: Creams, lotions, serums, and sunscreens – enhances texture, smoothness, and spreadability; forms a protective film that moisturizes and protects the skin.

• Makeup: Foundations, primers, and mascaras – improves pigment dispersion and adhesion; provides a smooth, even finish.

• Cleansing products: Body washes, facial cleansers – adds body, improves foam stability, and enhances skin feel.

• Other: Used in nail care, oral care, and household products.

Key Benefits

• Provides excellent film‑forming and thickening properties at low concentrations.

• Imparts elasticity, smoothness, and a silky feel to skin and hair.

• Stabilizes emulsions and improves product shelf life.

• Compatible with a wide range of cosmetic ingredients.

• Water‑soluble and easy to incorporate into formulations.

• Non‑toxic and safe for use in personal care products.

• Enhances the sensory profile of finished products (spreadability, non‑tacky finish).

Recommended Use
Typical usage levels range from 0.5–5.0% of the formulation, depending on the desired viscosity, film formation, and emulsion stability. For optimal performance, dissolve in the water phase with gentle heating (40–60°C) and moderate agitation. Can be combined with other thickeners, emulsifiers, and film‑forming agents to tailor rheology and sensory properties.

Safety and Handling

• Generally recognized as safe for use in cosmetics and personal care at recommended concentrations.

• Low irritation potential; well‑tolerated by skin.

• Avoid contact with strong oxidizers and acids.

• Store in a cool, dry place, away from direct sunlight and moisture.

• Use appropriate personal protective equipment (gloves, safety goggles) when handling.

Quality Assurance
Each batch is tested for molecular weight, viscosity, and pH to ensure consistent performance.