What Is Polyglyceryl-2 Diisostearate/Ipdi Copolymer?
Polyglyceryl-2 Diisostearate/Ipdi Copolymer is a man-made ingredient created by linking together small diglycerol units with isostearic acid and a molecule called isophorone diisocyanate. The result is a flexible film-forming polymer that mixes oil-loving and water-loving parts in one structure. Although the raw materials start out in vegetable oils and industrial chemicals, the finished copolymer is fully synthetic and produced in controlled factory settings.
This type of chemistry first appeared in the late 1990s when formulators were looking for gentler alternatives to traditional surfactants and stronger film formers for long-wear makeup. By reacting polyglycerin with fatty acids and then carefully adding the diisocyanate, manufacturers created a stable network that can lock water and oils together while leaving a soft touch on skin.
Today the copolymer is made in closed reactors where temperature and pH are monitored to keep the reaction balanced. After purification the material is delivered as a viscous liquid or solid flakes that dissolve into the oily phase of a cosmetic batch.
You will most often see Polyglyceryl-2 Diisostearate/Ipdi Copolymer in long-wear lipsticks, foundations, water-resistant mascaras, sunscreens, tinted moisturizers, cream blushes, solid balms and certain leave-on skin treatments that need a smooth non-greasy film.
Polyglyceryl-2 Diisostearate/Ipdi Copolymer’s Cosmetic Benefits/Uses
This multitasking polymer brings several formulating perks
- Binding – helps powdered pigments stick together so pressed makeup keeps its shape and applies evenly without crumbling
- Emulsion stabilising – keeps oil and water mixed, preventing creams or lotions from separating on the shelf or on your skin
- Film forming – creates a flexible layer that boosts wear time, improves water resistance and leaves a smooth comforting feel
Who Can Use Polyglyceryl-2 Diisostearate/Ipdi Copolymer
This ingredient is generally well tolerated by all skin types. Its lightweight film helps lock in moisture for dry or mature skin while the non-greasy finish suits normal and combination skin. Because it is non-ionic and free of common irritants it is usually comfortable even for sensitive skin. Acne-prone users also tend to do well since the polymer sits on top of skin rather than sinking deeply into pores, though very oily skin may prefer lighter textures if the final formula contains rich oils alongside the copolymer.
Polyglyceryl-2 Diisostearate/Ipdi Copolymer is synthesized from plant-based fatty acids and petroleum-free glycerol then reacted with a lab-made diisocyanate. No animal-derived substances are used in its production so it is suitable for both vegans and vegetarians.
No data suggest the polymer poses a risk to women who are pregnant or breastfeeding when used in rinse-off or leave-on cosmetics. This is not medical advice and anyone who is pregnant or nursing should review all personal care products with a qualified healthcare provider.
The ingredient does not absorb UV light and is not known to cause photosensitivity. It is fragrance free, gluten free and compatible with most other cosmetic actives.
Potential Side Effects/Adverse Reactions
Reactions to topical Polyglyceryl-2 Diisostearate/Ipdi Copolymer can vary from person to person. The following list covers potential side effects, but most users will not experience them when the ingredient is properly formulated and used as directed.
- Mild skin irritation – rare transient redness or itching, more likely on compromised or highly sensitive skin
- Allergic contact dermatitis – very uncommon allergy to residual monomers or stabilizers in the finished polymer
- Eye irritation – stinging or watering if the raw material or finished product accidentally gets into the eyes
- Acne-like breakouts – possible in individuals extremely prone to clogged pores if the overall formula is heavy or occlusive
If any discomfort, rash or other reaction occurs discontinue use and consult a healthcare professional.
Comedogenic Rating
Rating: 1 / 5. The molecule forms a breathable film that mostly stays on the skin surface and it is made of large polymer chains that cannot slip deep into pores. While it originates from fatty acids, the end product is far less greasy than raw oils and has shown low clog-pore potential in formulation tests. Most acne-prone users should tolerate it, especially when the finished product is lightweight or water based. If the formula pairs the polymer with heavy waxes or butters the overall product could still feel occlusive, so texture matters more than the polymer itself.
Summary
Polyglyceryl-2 Diisostearate/Ipdi Copolymer binds loose pigments, keeps oil and water mixed, and lays down a flexible film that improves wear time and water resistance. It carries out these jobs by combining a glycerin backbone that attracts water with fatty branches that grip oils, then linking everything into a stable network that spreads easily and dries smooth.
The ingredient is not a household name but it is steadily gaining traction in long wear makeup, waterproof sunscreens and hybrid skincare formulas where staying power is a selling point. Safety data and real-world use show a low risk of irritation or pore blockage, making it a dependable choice for most skin types. As with any new cosmetic, give a small patch test first to be sure your skin agrees with the full product.