Common Name(s): Polyester-27,synthetic polyester resin,film-former texture modifier

CAS Number: N/a

DESCRIPTION

What It Does: Forms hard adhesive films in nail products and colour cosmetics (aromatic polyesters) or flexible conditioning films in skin care (aliphatic polyesters) — the diol/diacid monomer composition determining tg and application performance.

Why It's Used: Polyesters provide a wider tg and hardness range than acrylate polymers — aromatic polyesters (tg 80-120c, rigid) for nail hardeners; aliphatic polyesters (tg -20 to 40c, flexible) for make-up and skin care films.

How It Works: Polycondensation of diol plus diacid produces ester linkages (-coo-). aromatic diacids (phthalic, terephthalic) provide rigid ring segments raising tg and hardness; aliphatic diacids (adipic, sebacic) provide flexible chains. ester carbonyls h-bond to nail keratin and skin proteins providing adhesion.

Typically Found In: Nail products,colour cosmetics,adhesive films

TECHNICAL DETAILS

Primary Category: Active ingredient – cosmetic active

Secondary Functions: Skin conditioning

Application Areas:

Typical Concentration Range: 1%–20%

SOURCING & ETHICS

Vegan Status: Conditional - supplier confirmation required

Halal Status: Unverified - supplier confirmation required

Source Notes: Commercially produced for cosmetic use. verify vegan/halal status with supplier. [audit 2026-07-29 rev2: the record's own source_notes does not assert a non-animal origin, or instructs the reader to verify with the supplier; "yes" asserts knowledge the record does not hold. determination requires shariah-panel sign-off.]

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Well-tolerated by most skin types.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Good safety profile at recommended concentrations. ewg score: 1–2.

Works Well With: Standard skincare actives

Avoid Combining With: No known significant incompatibilities

SCIENTIFIC NOTE

Polyester-27 compatibility: polyesters blend with nitrocellulose in nail lacquer to modify film properties — higher polyester content raises hardness but the tg difference from nitrocellulose must be managed for consistent gloss.

Last Verified: 2026-03-12

Primary Sources: Cosing database,polyester-27 cosmetic resin review