Methylstyrene/Vinyltoluene Copolymer

AKA: Copolymer resin
Synthetic
Clean
OriginProduced from the polymerization of methylstyrene and vinyltoluene monomers derived from petroleum-based hydrocarbons. Synthesized through free radical polymerization, combining the two vinyl monomers into a long-chain copolymer.
Benzene, ethenylmethyl-, polymer with (1-methylethenyl)benzene
CAS #
9017-27-0
Form
Liquid
State
Solid
Skin Types
●all-skin-types
Best For
General
Functions
Viscosity Controlling
Controls Viscosity
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
1
CIR
Safe as used
Pregnancy
—
Concentration Guide
Leave-on0.58%
Rinse-offNot reported
0%50%100%
CIR reported use · 2014 survey
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR