Isostearoyl Trimellitic Anhydride/Trimethylolpropane Copolymer

Isostearoyl Trimellitic Anhydride/Trimethylolpropane Copolymer 1
AKA: Film-Former
Plant-Derived
Occlusive
Not Clean
Isostearoyl Trimellitic Anhydride/Trimethylolpropane Copolymer is a copolymer of trimellitic anhydride and trimethylpropane chain-terminated by isostearic acid
Formula
C135H246O18
Mol. Weight
2157.4
CAS #
1190965-82-2
Form
Liquid
Functions
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Viscosity Controlling
Creates smooth texture
Helps control shine
Provides lightweight skin conditioning
Traditional Use
A synthetic polymer developed in the late 20th century for cosmetic use. Created to provide film-forming and conditioning properties in skincare and haircare products.
EWG
3
CIR
Insufficient data
Pregnancy
Yes
CIR Safety Findings
all-shades-safe
Potential Sensitizer
Regulatory Status
USAunder review
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR