Phthalic Anhydride/Trimellitic Anhydride/Glycols Copolymer

AKA: Modified Polyester Resin

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

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.

EWG

CIR

Safe as used

Pregnancy

Caution

CIR Safety Findings

Not a Sensitizer

medical-approval

all-shades-safe

Regulatory Status

USA✔ permitted

EU⚠ restricted

JAPAN⚠ restricted

CANADA⚠ restricted

Regulatory Agencies

EWG CIR FDA EU COSING Health Canada

Skin Types

●all-skin-types

Best For

General

Pregnancy & Breastfeeding Safe

Caution

The paper trail

🔬Peer-reviewed1 paper →

⚖️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