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Moumoujus

METHOXY PEG-90 METHACRYLATE.

Questionable / NOT REPORTED

METHOXY PEG-90 METHACRYLATE is a water-soluble monomer essential for synthesizing hydrophilic polymers and hydrogels. In cosmetic science, its derivatives enhance formulation properties, acting as emulsifying aids, solubilizers, and plasticizers, which can improve the skin's capacity to absorb other beneficial compounds. When polymerized into specific crosspolymers, it can also contribute to skin protection.

Summary

Monomer Skin Protectant Solubilizer Emulsifying Aid Plasticizer

Science

Mechanism of Action

This ingredient functions as a foundational monomer for constructing hydrophilic polymers and hydrogels. In its polymerized form, such as within an Acrylates/Methoxy PEG-90 Methacrylate Crosspolymer, it creates a protective film on the skin's surface. Its methoxy polyethylene glycol (mPEG) component significantly boosts the hydrophilicity of a formulation, thereby improving the dissolution and stability of other substances in aqueous solutions. Additionally, it serves as an emulsifying aid and plasticizer, potentially facilitating improved absorption of various cosmetic additives by the skin.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

This ingredient functions primarily as a monomer for polymer synthesis and a formulation aid, not as an active compound typically subject to 'dusting' thresholds for efficacy or irritation.

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Stability

As a monomer, METHOXY PEG-90 METHACRYLATE requires stringent storage conditions, including drying at -20℃ and protection from light, to prevent premature polymerization. To maintain stability, inhibitors like 4-methoxyphenol (MeHQ) are commonly incorporated at concentrations of 100-200 ppm. Methacrylate esters are known to be susceptible to hydrolysis at extreme pH values, suggesting optimal stability within a moderated pH range for cosmetic formulations.

Conflicts

  • Substances that initiate radical polymerization (for the monomer form)

Safety

Safety Profile

CIR Status
Safe with restrictions
Sensitization risk High

The Cosmetic Ingredient Review (CIR) Expert Panel has determined that methacrylate ester monomers, including this ingredient, carry a high potential for strong sensitization and should not be in contact with the skin, especially in nail enhancement products. However, the CIR Panel deemed its polymerized form, Acrylates/Methoxy PEG-90 Methacrylate Crosspolymer, safe in cosmetics when formulated to be non-irritating. This safety relies critically on maintaining residual unreacted monomer levels at very low concentrations, typically 20 ppm or below in the final product, to mitigate sensitization risks.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

While invaluable as a monomer for creating beneficial polymers and formulation enhancers, METHOXY PEG-90 METHACRYLATE itself presents a high sensitization risk if unreacted levels in cosmetic products exceed extremely low concentrations (e.g., below 20 ppm), demanding meticulous formulation control for safe skin contact.

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