Trimethylpentanediol/Isophthalic Acid/Trimellitic Anhydride Copolymer

AKA: Polyester Copolymer, Film-Forming Polymer

Synthetic

Occlusive

Acid

Not Clean

1,3-Isobenzofurandione, 5-carboxy-, polymer with 1,3-benzenedicarboxylic acid and 2,2,4-trimethyl-1,3-pentanediol

CAS #

92-44-4

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

Creates protective layer

Controls product thickness

Traditional Use

A synthetic polymer developed for modern cosmetics as a film-forming and water-resistant agent. Used in long-wear makeup formulations to improve adherence and durability.

EWG

CIR

Safe as used

Pregnancy

Yes

CIR Safety Findings

medical-approval

all-shades-safe

Potential Sensitizer

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

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: CosIng · EWG · CIR