Isostearoyl Trimellitic Anhydride/Trimethylolpropane Copolymer

AKA “Isostearoyl Trimellitic Anhydride/Trimethylolpropane Copolymer, Film-Former”

Synthetic

Ingredient Facts

Isostearoyl trimellitic anhydride/trimethylolpropane copolymer

AKA: Film-Former

Synthetic · Film Forming · EWG: 3

Plant-Derived Synthetic

Occlusive

Skin Conditioner

Synthetic

Clean

A plant-derived film-former that creates a smooth, protective layer on skin, helping makeup and skincare products stay put longer while maintaining a natural finish.

Formula

C135H246O18

Mol. Weight

2157.4

CAS #

1190965-82-2

Form

Liquid

See origin →

Functions

Film Forming

Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.

Skin Conditioning

A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.

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.