murphyIsostearoyl Trimellitic Anhydride/Trimethylolpropane Copolymer
AKA: Film-Former
Plant-Derived
Occlusive
Not Clean
OriginDerived from isostearic acid and trimellitic anhydride, both petroleum-derived chemical compounds in the polyester family. Synthesized through esterification and polycondensation reactions between the acid anhydride and trimethylolpropane.
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
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
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
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