What Is Ipdi/Poly(1,4-Butanediol)-14 Crosspolymer?
Ipdi/Poly(1,4-Butanediol)-14 Crosspolymer is a synthetic ingredient created by linking a short chain poly(1,4-butanediol) with isophorone diisocyanate (often shortened to IPDI). After the first link is formed, the material is further tied together using a small molecule called bis-(aminopropyl)amine. The end result is a three-dimensional urethane network that looks and feels like a fine powder. This solid structure makes the polymer easy to disperse in creams, lotions or pressed powders without dissolving in them.
The use of polyurethane chemistry in cosmetics grew in the early 2000s when formulators wanted lightweight fillers that could add body to products without feeling greasy. Ipdi/Poly(1,4-Butanediol)-14 Crosspolymer fits that need and has since appeared in a variety of personal care launches. Manufacturing starts with heating poly(1,4-butanediol) and IPDI under controlled conditions so the two react. Once the chains reach a set length, bis-(aminopropyl)amine is added to crosslink the material into a stable lattice. The resulting polymer is washed, dried and milled into a fine, free-flowing powder.
You will most often see this ingredient in foundations, setting powders, creamy blushes, sunscreens, masks and anti-aging serums where it helps give the formula a smooth, velvety feel and a fuller look in the jar.
Ipdi/Poly(1,4-Butanediol)-14 Crosspolymer’s Cosmetic Benefits/Uses
This ingredient plays a single but important role in cosmetic formulas
Bulking: As a bulking agent it adds substance and density to a product so it feels substantial when you scoop or pump it out. This can improve the user experience by making thin or watery formulas feel richer without relying on heavy oils or waxes. In powder makeup it increases volume, helping the product press better into pans and pick up evenly on brushes, which results in a smoother application on the skin.
Who Can Use Ipdi/Poly(1,4-Butanediol)-14 Crosspolymer
This polymer is considered gentle and inert so it can be used by all skin types including oily, dry, combination and sensitive skin. It does not clog pores or leave an occlusive film so acne-prone users usually tolerate it well.
Because the ingredient is fully synthetic and contains no animal-derived substances it fits the standards followed by vegans and vegetarians.
Available safety data show no special risks for women who are pregnant or breastfeeding when the ingredient is used in normal cosmetic amounts. That said this is not medical advice and anyone who is expecting or nursing should review any product with a qualified healthcare provider.
Ipdi/Poly(1,4-Butanediol)-14 Crosspolymer is not known to cause photosensitivity so it will not make skin more reactive to sunlight.
Potential Side Effects/Adverse Reactions
Responses to topical ingredients vary from person to person. The points below outline potential side effects but most users will not experience them when the ingredient is used as part of a properly formulated product.
- Mild skin irritation such as redness itching or dryness
- Contact dermatitis in individuals allergic to polyurethane materials
- Eye irritation if loose powder enters the eyes during application
- Respiratory discomfort from inhaling airborne powder during manufacturing or careless use of bulk product
If any unwanted reaction occurs stop using the product and consult a healthcare professional.
Comedogenic Rating
Rating: 0 / 5
Ipdi/Poly(1,4-Butanediol)-14 Crosspolymer is a large, insoluble powder that sits on the surface of the skin without melting into pores or forming an oily film. Its particle structure is too big to become trapped inside follicles, so it does not encourage blackheads or pimples. As a result it earns a solid non-comedogenic score of 0.
This makes the ingredient a comfortable choice for people who are prone to acne or frequent breakouts.
Because it is usually blended into finished products rather than used on its own, the overall comedogenic feel of a formula will also depend on the other ingredients present.
Summary
Ipdi/Poly(1,4-Butanediol)-14 Crosspolymer is a synthetic bulking agent that boosts the body of creams, lotions or powders without adding grease. Its crosslinked polyurethane network stays solid, giving formulas a fuller look and a soft, velvety texture while remaining lightweight on skin.
Although it is not a headline ingredient like hyaluronic acid or vitamin C, it quietly shows up in many modern foundations, setting powders, sunscreens and skincare hybrids where texture makes or breaks the user experience.
Current safety data place it in the low-risk category for skin irritation, sensitization or clogging. Still, individual sensitivities vary so it is smart to patch test any new product that contains this polymer before applying it to the entire face.