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Moumoujus

POLYURETHANE CROSSPOLYMER-1.

Valuable / BINDING

Polyurethane Crosspolymer-1 is a polymeric film-forming agent that creates a protective, smoothing film on the skin's surface. This ingredient is utilized to enhance skin texture, extend the longevity of cosmetic formulations, and provide binding properties for product stability.

Summary

film-forming binding

Science

Mechanism of Action

This ingredient functions by creating an invisible, protective polymeric film on the skin. This film significantly improves surface smoothness and contributes to the prolonged wear and hold of cosmetic products, particularly makeup. Furthermore, it acts as a binding agent, maintaining the cohesion and structural integrity of powdered cosmetic formulations.

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 4 – 9
0 7 14

Stability

Polyurethane Crosspolymer-1 is typically formed in an aqueous suspension, meaning it disperses effectively in water rather than achieving true solubility. It demonstrates robust stability within a pH range of 4 to 9, where significant hydrolysis is not anticipated for related polyurethanes. Formulators should be vigilant regarding commercial preparations of polyurethanes, as they may contain sensitizers like methylisothiazolinone (MI); it is critical to avoid combining solutions that could lead to an undesirable concentration of such additives.

Safety

Safety Profile

CIR Status
Safe with restrictions
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has assessed polyurethanes, including Polyurethane-1, and concluded they are safe under current usage practices and concentrations, provided they are formulated to be non-sensitizing. The panel found no evidence of residual isocyanates or other monomers. While no specific maximum concentration for Polyurethane Crosspolymer-1 was noted, a related polyurethane (Polyurethane-33) has been reported safe for leave-on dermal exposure at concentrations up to 7.5%. Formulators must ensure that raw material suppliers do not introduce sensitizing agents, such as methylisothiazolinone, into the final product via polyurethane emulsions or solutions.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
No Oily
No Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Polyurethane Crosspolymer-1 is a valuable ingredient for improving cosmetic wear, enhancing skin texture, and providing structural integrity to formulations through its film-forming and binding properties, with a low irritancy profile.

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