Polyquaternium 4 ●
TL;DR. This ingredient is a cationic conditioning polymer and film-former used mainly in hair care to improve combability, reduce static, add slip, and support light hold. It can also help stabilize the feel of shampoos and styling products by depositing a thin positively charged film on negatively charged hair fibers.
What does Polyquaternium 4 do in a cosmetic formula?
This ingredient is a cationic conditioning polymer and film-former used mainly in hair care to improve combability, reduce static, add slip, and support light hold. It can also help stabilize the feel of shampoos and styling products by depositing a thin positively charged film on negatively charged hair fibers.
Is Polyquaternium 4 clean?
From a clean-beauty perspective, it is usually well tolerated on skin and hair because the polymer is large and has low penetration potential. The main friction is its synthetic quaternary polymer status, possible residual monomer controls, and scrutiny from standards that limit persistent synthetic polymers.
Is Polyquaternium 4 sustainable?
This material is typically based on a cellulose-derived backbone that is chemically modified with synthetic cationic groups. It is less readily biodegradable than unmodified cellulose, and its charged polymer structure can bind to wastewater solids rather than breaking down quickly in aquatic systems.
Is Polyquaternium 4 COSMOS-approved?
It is generally not permitted under COSMOS natural or organic certification because it is a synthetic quaternized polymer rather than an approved natural-origin derivative. Its partial cellulose origin is a plus, but permanent cationic modification, limited biodegradability, and polymer persistence make it a weaker Green Chemistry fit.
How does Polyquaternium 4 work chemically?
This compound is a water-soluble, permanently cationic cellulose-based polymer that adsorbs strongly to keratin through electrostatic attraction. It is commonly used at low levels in rinse-off and leave-on hair formulas, remains functional across typical cosmetic pH ranges, and can be sensitive to incompatibility with strongly anionic systems depending on charge density and formulation balance.
Last updated 2026-05-13