1,4-Butanediol/Succinic Acid/Adipic Acid/HDI Copolymer
AKA “Polyester Copolymer
Acid
Ingredient Facts
1,4-butanediol/succinic acid/adipic acid/hdi copolymer
AKA: Polyester Copolymer
Acid · Film Forming · EWG: 4
Synthetic
Occlusive
Acid
Not Clean
Hexanedioic acid, polymer with butanedioic acid, 1,4-butanediol and 1,6-diisocyanatohexane
CAS #
119553-67-2
State
Solid
See origin →
Functions
Abrasive
Binding
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Physical Exfoliant
Holds Formula Together
Creates Protective Barrier
Gently polishes surface
Creates protective layer
Holds ingredients together
Traditional Use
A modern synthetic polymer developed for the cosmetics industry to create film-forming and conditioning properties. This complex copolymer was engineered to provide benefits not achievable with traditional natural ingredients.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: CosIng · EWG · CIR