What Is Bis-Hema Poly(1,4-Butanediol)-14/Ipdi Copolymer?
Bis-Hema Poly(1,4-Butanediol)-14/Ipdi Copolymer is a man-made ingredient created by linking together small units of poly(1,4-butanediol)-14 and isophorone diisocyanate, then finishing the chain with hydroxyethyl methacrylate. Chemists call this process copolymerization. The result is a flexible yet sturdy polymer that behaves a bit like a microscopic net when it is spread on skin.
This material comes from the broader family of polyurethane and acrylate polymers that first gained cosmetic attention in the late 1990s when formulators were hunting for lightweight film formers that would not feel sticky. By tweaking the backbone with butanediol and IPDI they found a balance of softness and strength ideal for leave-on products.
Production starts with purified butanediol and IPDI, both sourced from petrochemical or plant-derived glycols, which react under controlled heat. Once the right chain length is reached, HEMA caps the ends so the polymer stays stable in water-based creams and gels. After neutralization and filtering the finished copolymer arrives as a clear liquid or fine powder ready to be blended into formulas.
You will most often spot this ingredient in primers, long-wear foundations, peel-off masks, anti-aging serums, lightweight moisturizers and certain hair styling products where a flexible hold and smooth finish are needed.
Bis-Hema Poly(1,4-Butanediol)-14/Ipdi Copolymer’s Cosmetic Benefits/Uses
In personal care formulas this copolymer mainly brings two helpful roles:
- Binding: It holds pigments, shimmer particles and other ingredients together so they stay evenly suspended. This keeps makeup from separating in the bottle and helps color glide on in a smooth coat.
- Skin conditioning: When the polymer dries it forms a thin breathable film that leaves skin feeling soft and flexible while reducing moisture loss. The film also creates a silky finish that can blur fine lines for a more polished look.
Who Can Use Bis-Hema Poly(1,4-Butanediol)-14/Ipdi Copolymer
This polymer is considered friendly for most skin types including dry, normal and oily skin because it forms a breathable film without heavy oils or waxes. Even sensitive skin usually tolerates it since it is non-acidic and has a large molecular size that does not easily penetrate the skin barrier. Those with highly reactive or allergy-prone skin should check the full ingredient list to be sure no residual monomers or reactive solvents remain in the final product.
The material is synthesized entirely from laboratory sources and contains no animal-derived content so it is suitable for vegans and vegetarians. Its production process also avoids common animal by-products such as glycerin from tallow.
Current data show no specific warnings for women who are pregnant or breastfeeding. Because individual circumstances vary, this information is not medical advice and anyone who is expecting or nursing should review any skincare product with their healthcare provider before use to be extra safe.
Bis-Hema Poly(1,4-Butanediol)-14/Ipdi Copolymer does not increase photosensitivity, meaning it will not make skin more likely to burn in sunlight. Standard sun protection is still recommended whenever spending time outdoors.
The ingredient does not interfere with most actives or medications applied topically and it remains stable across a broad pH range, making it easy to layer with other products.
Potential Side Effects/Adverse Reactions
Side effects from topical use of Bis-Hema Poly(1,4-Butanediol)-14/Ipdi Copolymer vary from person to person. The points below list potential reactions that could occur, though they are uncommon when the ingredient is properly formulated and used as directed.
- Mild skin irritation such as redness or stinging, usually linked to trace residual monomers
- Allergic contact dermatitis in individuals hypersensitive to polyurethane or acrylate compounds
- Temporary tightness or dryness if a high-film product is layered repeatedly without moisturizer
- Eye irritation if the raw polymer dust or concentrated solution accidentally contacts the eyes
If any negative reaction occurs stop use immediately and consult a healthcare professional for further guidance.
Comedogenic Rating
Rating: 0 / 5
Bis-Hema Poly(1,4-Butanediol)-14/Ipdi Copolymer earns a zero because it is a large, water-dispersible polymer that sits on the skin’s surface rather than seeping into pores. It contains no greasy fatty acids or waxes that can trap sebum and has a lightweight, breathable film structure that allows normal oil flow. As a result, it is generally considered suitable for people prone to acne or breakouts.
Keep in mind that the finished product’s overall pore-clogging potential also depends on the other ingredients in the formula. If the copolymer is combined with heavy oils or butters the final product could still feel occlusive.
Summary
Bis-Hema Poly(1,4-Butanediol)-14/Ipdi Copolymer works mainly as a binder and skin-conditioning film former. Its flexible polymer network locks pigments or actives in place so makeup stays uniform and skincare remains stable while creating a thin veil that softens skin feel and slows water loss.
Although not a buzzword ingredient it shows up quietly in long-wear cosmetics, lightweight primers and a handful of modern serums because formulators value its smooth finish and reliable performance.
Current safety data rate it as low risk with minimal irritation potential when properly formulated. Still, trying any new product on a small patch of skin first is the smartest way to spot personal sensitivities before full-face use.