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Thickener

BIS-PMMA/POLYBUTYL ACRYLATE COPOLYMER

CAS 25852-37-3
78

Safety score · 0–100

Fine

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

A high-MW block copolymer of PMMA and polybutyl acrylate used to control viscosity. The cured polymer is well tolerated; safety attention focuses on keeping residual MMA and butyl acrylate monomer levels low.

Function

VISCOSITY CONTROLLING

Skin benefits

  • Effective viscosity control in cosmetics
  • Provides flexible, durable films
  • High molecular weight reduces skin penetration
  • Compatible with both solvent and aqueous systems

Known concerns

  • Residual methyl methacrylate is a known sensitizer
  • Residual butyl acrylate is a known sensitizer
  • Microplastic environmental persistence
  • EU residual-monomer compliance required

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.