Acrylic Acid/Acrylamidomethyl Propane Sulfonic Acid Copolymer

What is Acrylic Acid/Acrylamidomethyl Propane Sulfonic Acid Copolymer?

This ingredient is a synthetic, high-molecular-weight copolymer derived from acrylic acid and acrylamidomethyl propane sulfonic acid monomers. Primarily used in water-based cosmetics like creams, lotions, gels, serums, and cleansers, it acts as a multifunctional rheology modifier. Upon hydration, it forms a three-dimensional gel network that delivers clarity, smoothness, and shear-thinning behavior, allowing easy spreading. The polymer's structure enables it to trap and suspend insoluble particles such as pigments or exfoliants, while its charged sulfonic groups bind metal ions to maintain formula clarity and prevent degradation. This contributes to long-term product integrity and enhances sensory attributes like non-drip consistency and velvety finish without stickiness.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Chelating agent
Binds to metal ions to prevent them from affecting product stability or skin.
Suspending agent
Keeps insoluble particles (pigments, beads, actives) evenly dispersed by increasing viscosity or forming a network, preventing settling and separation.
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.

Benefits

Improves formula stability by capturing metal ions that could cause discoloration or breakdown.

Maintains even distribution of particles like pigments or actives, avoiding settling or clumping.

Optimizes texture for smooth application and comfortable skin feel across various product types.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Users of lotions or gels needing separation-free stability.
Those with rare sensitivities to acrylic-based polymers.
Individuals applying products with suspended particles for uniform coverage.
Individuals strictly avoiding synthetic ingredients.
People preferring lightweight yet viscous formulas for daily routines.
People with unconfirmed contact allergies to sulfonated compounds.

Safety Notes

  • Low hazard profile from cosmetic safety assessments.
  • Minimal risk of irritation or comedogenicity in typical use.

Frequently Asked Questions about Acrylic Acid/Acrylamidomethyl Propane Sulfonic Acid Copolymer

What does this copolymer do in products?

It thickens water-based formulas, suspends particles, and stabilizes by binding metals for consistent performance.

Is it suitable for sensitive skin?

Generally low irritation risk based on safety data, but patch test recommended for personal tolerance.

Found in which skincare types?

Common in creams, gels, serums, and cleansers needing viscosity and suspension control.