Phthalic Anhydride/Trimellitic Anhydride/Glycols Copolymer
AKA “Modified Polyester Resin
Ingredient
Ingredient Facts
Phthalic anhydride/trimellitic anhydride/glycols copolymer
AKA: Modified Polyester Resin
Ingredient · Film Forming · EWG: 1
Synthetic
Occlusive
Clean
1,3-Isobenzofurandione, polymer with 5-carboxy-1,3-isobenzofurandione, 1,2-ethanediol and 2,2-dimethyl-1,3-propanediol
Form
Liquid
State
Solid
See origin →
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 Protective Barrier
Controls Viscosity
Anti-Aging Benefits
Antioxidant Protection
Reduces Inflammation
Creates protective layer
Controls product thickness
Traditional Use
A synthetic polymer developed for cosmetic use to provide film-forming and conditioning properties. Created in modern cosmetic chemistry as an alternative to natural resins for improved product stability and performance.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
EWG
1
CIR
Safe as used
Pregnancy
Caution
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: CosIng · EWG · CIR