Methylstyrene/Vinyltoluene Copolymer

Methylstyrene/Vinyltoluene Copolymer 1
AKA: Copolymer resin
Synthetic
Clean
Benzene, ethenylmethyl-, polymer with (1-methylethenyl)benzene
CAS #
9017-27-0
Form
Liquid
State
Solid
Functions
Viscosity Controlling
Controls Viscosity
Traditional Use
A synthetic polymer developed in the mid-20th century for use in cosmetics, particularly in hair styling products and nail polish. Created to provide film-forming and holding properties.
EWG
1
CIR
Safe as used
Pregnancy
—
CIR Safety Findings
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Skin Types
●all-skin-types
Best For
General
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.
Verified Jun 2026
Data: CosIng · EWG · CIR