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Moumoujus

BUTYL MALEATE.

Valuable CAS 925-21-3 / NOT REPORTED

A sophisticated polymer film-former that creates an invisible, flexible network on skin to enhance product performance and longevity. Primarily used in copolymer form, it excels at anchoring active ingredients like UV filters while providing water resistance and improved application uniformity.

Summary

film forming product performance enhancer water resistance booster

Science

Mechanism of Action

Forms a hydrophobic, flexible polymer film on the stratum corneum that acts as a 'second skin' network, anchoring cosmetic actives to prevent wash-off while enhancing uniformity and durability of product application through superior adhesion properties.

Research

Clinical Evidence

High confidence
Effective range 1–10%
Optimal

5%

Key findings

  1. 01 VA/Butyl Maleate/Isobornyl Acrylate Copolymer demonstrated non-irritating and non-sensitizing properties in human repeat insult patch testing with no phototoxicity potential
  2. 02 Significantly enhanced SPF retention and water resistance in anhydrous sunscreen formulations through improved film formation and UV filter anchoring

Transparency

Dusting Analysis

Not commonly dusted

Specialized film-forming polymer not commonly used for ingredient dusting due to its technical formulation requirements and specific performance applications

The Formula

Formulation

Solubility
Both
Optimal pH 4 – 12
0 7 14

Stability

Exceptionally stable across wide pH range; naturally soluble in ethanol and oils, can be rendered water-soluble through neutralization of free acid groups

Synergies

  • UV filters (enhanced retention)
  • Ethanol-based systems
  • Oil-based formulations

Conflicts

  • Acrylates/Dimethicone Copolymer
  • High electrolyte concentrations when neutralized

Safety

Safety Profile

CIR Status
Safe as used
Max tested
10%
Sensitization risk Low

CIR Expert Panel approval with 10% limit for aerosol applications to minimize inhalation exposure; residual monomer levels strictly controlled to prevent sensitization

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

A high-performance film-former that significantly enhances product longevity and water resistance with excellent safety profile across all skin types.

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