Polyester-5
What is Polyester-5?
Polyester-5 is a synthetic polymer, chemically known as the copolymer of adipic acid, neopentyl glycol, and trimellitic anhydride. This clear, flexible resin is widely incorporated into cosmetic products like sunscreens, foundations, lipsticks, and hair sprays. It works by depositing a sheer, adherent layer on skin or hair, boosting resistance to water, sweat, and rubbing while maintaining a natural feel. As a viscosity controller, it modifies flow properties, ensuring smooth application, even distribution, and product stability without separation. Its robust molecular structure allows it to withstand environmental stresses, supporting long wear in makeup and protective barriers in sun care, all while being compatible with other formulation components.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Benefits
Forms a durable film to extend makeup and sunscreen wear
Optimizes product thickness for better spread and feel
Adds water and transfer resistance without heaviness
Who It's For
A quick guide for who this ingredient may suit (and who should be cautious).
| Who May Benefit | Who Should Avoid |
|---|---|
| Users wanting long-lasting, smudge-proof cosmetics | Those with rare sensitivities to polyester resins |
| People applying water-resistant sunscreens or styling aids | People strictly avoiding synthetic polymers |
| Individuals with oily or acne-prone skin due to non-comedogenic nature | Individuals who prefer fully natural formulations |
Safety Notes
- Rated low hazard in cosmetic safety assessments
- No notable irritation or comedogenicity concerns reported
Frequently Asked Questions about Polyester-5
What does Polyester-5 do in products?
It creates protective films for longevity and adjusts thickness for smooth texture.
Is Polyester-5 suitable for sensitive skin?
It has a low irritation profile based on safety reviews.
Can Polyester-5 be used in sunscreens?
Yes, it enhances water resistance and hold in sun protection formulas.