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POLYQUATERNIUM-4/HYDROXYPROPYL STARCH COPOLYMER.

Valuable CAS - / FILM FORMING, HAIR CONDITIONING

This cationic polymer forms a protective, adsorptive film on the skin's surface, effectively minimizing transepidermal water loss and shielding against environmental aggressors. It enhances product moisturization by binding with water molecules, promoting hydrated, smoother, and conditioned skin.

Summary

Film-forming Moisturizing Humectant Protective

Science

Mechanism of Action

POLYQUATERNIUM-4/HYDROXYPROPYL STARCH COPOLYMER functions as a cationic polymer, utilizing its positive charge to electrostatically bind to the negatively charged surface of the skin. This interaction leads to the formation of a delicate, protective film or network that adsorbs to the epidermis. This film helps to reduce transepidermal water loss, fortifying the skin's barrier function and offering a degree of protection against external irritants. Additionally, it enhances skin hydration by attracting and retaining water molecules, contributing to a more conditioned and moisturized epidermal state, potentially acting as a humectant.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 3 – 7
0 7 14

Stability

This ingredient exhibits optimal stability within a pH range of 3 to 7. It is reported to be chemically stable, temperature-resistant, and resilient to both acidic and alkaline conditions.

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has not specifically reviewed POLYQUATERNIUM-4/HYDROXYPROPYL STARCH COPOLYMER. However, other Polyquaternium compounds, such as Polyquaternium-11, -22, and -39, have been evaluated and deemed safe for cosmetic use, with Polyquaternium-11 being safe up to 50% concentration. The Polyquaternium-4 component alone has an Environmental Working Group (EWG) rating of 1, signifying a low hazard profile concerning cancer, allergies, immunotoxicity, and reproductive/developmental toxicity. While direct EWG data for the copolymer's skin allergies and irritation is currently unavailable, its Incidecoder assessment notes low irritancy and comedogenicity. No specific SCCS or FDA safety status was identified for this exact copolymer.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

POLYQUATERNIUM-4/HYDROXYPROPYL STARCH COPOLYMER is a valuable ingredient for enhancing skin hydration and barrier protection across all skin types, demonstrating a favorable safety and compatibility profile.

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