murphyPotassium Butyl Ester of PVM/MA Copolymer
molecular structure · PubChem
AKA: Potassium Butylparaben, BUTYLPARABEN, POTASSIUM SALT, P-HYDROXYBENZOATE POTASSIUM SALT, BENZOIC ACID
Synthetic
Occlusive
Not Clean
OriginDerived from polyvinyl methyl ether and maleic anhydride copolymer, a synthetic polymer chemical family. Synthesized by esterification of the copolymer with butanol, then neutralized with potassium hydroxide.
Potassium salt of butyl ester of PVM/MA copolymer
Formula
C11H13KO3
Mol. Weight
232.32
CAS #
38566-94-8
Form
Liquid
State
Liquid
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Binding
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Holds Formula Together
Creates Protective Barrier
Creates protective layer
Holds ingredients together
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed0 reviews
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
4
CIR
Safe as used
Pregnancy
Yes
Restricted By
Concentration Guide
Reported use0.062%
0%50%100%
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR