Polyquaternium-7

Description

Overview of Polyquaternium-7

Polyquaternium-7 (INCI: Polyquaternium-7) is a water-soluble cationic polymer widely used in cosmetics, especially in hair care. It functions as a conditioning agent, helping with detangling, slip, and anti-static properties. It can also form a lightweight film on the hair, which contributes to manageability and shine.

Key properties

• Charge: Cationic (positive) — which helps it bind to the negatively charged hair surface.
• Solubility: Water-soluble.
• Film formation: Forms a flexible, conditioning film on hair.
• Stability: Generally stable across typical cosmetic pH ranges (roughly pH 4–9, but always verify with the supplier).

Common uses

• Hair care: Primary use is in conditioners (rinse-off and leave-on), detangling aids, and some styling products to reduce frizz and static.
• Shampoos: Used to boost conditioning effects and improve combability after washing.
• Skin care: Occasionally found in lotions or creams as a conditioning aid and thickener, though it is far more common in hair care.

How it works

• The positive charge of Polyquaternium-7 interacts with the negatively charged sites on hair fibers, helping it adhere to the cuticle.
• This creates a slipping effect that makes combing easier, reduces static, and can leave hair feeling smoother.
• The film it forms can provide a light, lasting conditioning effect without creating heavy buildup when used at recommended levels.

Typical use levels (approximate guidelines)

Actual recommended concentrations come from the supplier and depend on product type. Always follow the specific product’s technical data sheet.

• Shampoos: roughly 0.1% to 0.5%
• Conditioners (rinse-off): roughly 0.5% to 2.0%
• Leave-on / styling products: up to about 2% or slightly higher, depending on formulation

Formulation considerations

• Polyquaternium-7 is typically added after surfactants in the formulation process and may be included at stages where the product is below high shear and heat.
• It can interact with high levels of anionic surfactants if the formulation is not balanced, so formulators test stability and performance during development.
• Regular use can lead to buildup on hair with insufficient cleansing, so periodic clarifying or thorough washing is beneficial.

Safety and regulatory notes

• Polyquaternium-7 is considered safe for cosmetic use at standard usage levels.
• As with many cosmetic ingredients, a patch test is sensible for sensitive individuals.
• Always consult the current Safety Data Sheet (SDS) and supplier specifications for precise handling, storage, and use guidelines.

Quick comparison (conceptual)

• Polyquaternium-7: Mild conditioning, good slip and detangling, light film, commonly used in rinse-off conditioners and some shampoos.
• Other polyquaterniums (such as PQ-10 and PQ-11) are also conditioning polymers but differ in molecular weight, film-forming tendency, and thickening behavior. Formulators choose based on the desired sensory feel, wash-off vs leave-on performance, and potential buildup.

Practical takeaway

• If you’re Formulating: Polyquaternium-7 is a versatile conditioning polymer for hair care that enhances detangling, reduces static, and provides a light conditioning film. Use at typical conditioning levels and test for compatibility with your surfactants and other additives.
• If you’re selecting a product: Look for the INCI name “Polyquaternium-7” on ingredient lists to identify its presence in conditioners, shampoos, or styling products.

If you’d like, I can tailor the information to a specific product type (e.g., a conditioner formula you’re developing) or compare Polyquaternium-7 with another polyquaternium on the market.