polyquaternium7

Polyquaternium-7 (PQ-7) is a synthetic, water-soluble cationic polymer used as a conditioning agent in cosmetics and personal care products. It is part of the broader polyquaternium family of quaternary ammonium polymers, and the polymer carries positive charges along its chain, which promotes adhesion to negatively charged hair surfaces.

In hair care applications, PQ-7 provides slip and detangling, reduces friction, and helps improve combability. By forming a light conditioning layer on the hair shaft, it can contribute to a smoother feel, reduced static, and perceived softness. Some formulations use PQ-7 to modify rheology or viscosity as well, supporting the texture and stability of shampoos, conditioners, and styling products.

Typical use levels in cosmetic products range from about 0.1% to 2% by weight, depending on product type and desired performance. PQ-7 is commonly found in shampoos, conditioners, leave-on treatments, detanglers, and certain styling aids. Because it is cationic, it is often formulated with nonionic or cationic surfactants and other conditioning agents, and there can be considerations regarding interactions with anionic ingredients that may affect deposition.

Safety and regulatory status: PQ-7 is generally regarded as safe for topical use in cosmetics at customary concentrations and is not typically associated with significant irritation. As with other conditioning polymers, some individuals may experience sensitivity or buildup with prolonged use, and formulation choices should account for compatibility with other ingredients.

Environmental considerations: data on biodegradability and aquatic effects for polyquaternium polymers vary, and as with many quaternary ammonium compounds, environmental impact depends on formulation and wastewater treatment.