Ingredient review
Bis-Hydroxypropylmethacrylate Polybutanediol/IPDI Copolymer
INCI: BIS-HYDROXYPROPYLMETHACRYLATE POLY(1,4-BUTANEDIOL)-9/IPDI COPOLYMER
A synthetic polymer that helps makeup and sunscreen stay put longer by forming a flexible, water-resistant film.
In plain English
This is a man-made ingredient that creates a thin, flexible film on your skin or hair. Think of it like a clear, invisible shield that helps makeup last longer, keeps sunscreen from washing off easily, and gives hair products hold without stiffness. It's designed to be gentle and non-clogging for most skin types.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Bis-Hydroxypropylmethacrylate Polybutanediol/IPDI Copolymer is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Bis-Hydroxypropylmethacrylate Polybutanediol/IPDI Copolymer.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A synthetic copolymer made from methacrylate and diisocyanate chemistry, engineered to form a durable yet flexible film on surfaces.
How it works
When applied, the polymer molecules link together as the solvent evaporates, forming a continuous, water-resistant layer that adheres to skin or hair. This film helps lock in other ingredients and resists smudging or running from sweat, humidity, or light water exposure.
Pros
Long-lasting wear
Helps makeup and sunscreen resist fading, smudging, and water exposure for hours, reducing the need for touch-ups.
Flexible finish
Unlike some older polymers, this one stays flexible so it doesn't crack or feel stiff on skin or hair.
Cons and cautions
Removal can be tricky
Because it's water-resistant, you may need an oil-based cleanser or double cleansing to fully remove it, which can be inconvenient.
Potential tightness
On very dry or sensitive skin, the film can feel slightly tight or drying, especially if used in high concentrations.
Best for
- People who want long-wearing makeup or waterproof sunscreen
- Those with normal to oily skin looking for a matte finish
Use caution if
- Individuals with extremely dry or compromised skin barriers who may find film-formers uncomfortable
Usage tips
Safety summary
Considered safe for cosmetic use at typical concentrations. Low irritation and comedogenic potential. No significant safety concerns reported in regulatory reviews.
Research notes
Safety is supported by industry data and regulatory assessments. No peer-reviewed human studies on this specific polymer were found, but it is structurally similar to other well-studied film-formers with good safety profiles.
Common label clues
- Typical concentration
- Typically 1–10% in leave-on products
- Regulatory status
- Approved for use in cosmetics globally, including by the U.S. FDA and EU CosIng database, with no known restrictions at typical use levels.
- Common uses
- Long-wear foundations, Waterproof mascaras, Sunscreens, Hair styling products
- Environmental note
- As a synthetic polymer, it is not biodegradable and may persist in the environment. Some regions are evaluating microplastic regulations that could affect future use.
Good to know
- This polymer is often used in 'transfer-proof' or '24-hour wear' makeup formulas.
- It is not a sunscreen active ingredient but helps sunscreens stay effective longer by resisting water and sweat.
Common questions
What is Bis-Hydroxypropylmethacrylate Polybutanediol/IPDI Copolymer in beauty products?
This is a man-made ingredient that creates a thin, flexible film on your skin or hair. Think of it like a clear, invisible shield that helps makeup last longer, keeps sunscreen from washing off easily, and gives hair products hold without stiffness. It's designed to be gentle and non-clogging for most skin types.
What does Bis-Hydroxypropylmethacrylate Polybutanediol/IPDI Copolymer do in a beauty product?
When applied, the polymer molecules link together as the solvent evaporates, forming a continuous, water-resistant layer that adheres to skin or hair. This film helps lock in other ingredients and resists smudging or running from sweat, humidity, or light water exposure.
Is Bis-Hydroxypropylmethacrylate Polybutanediol/IPDI Copolymer safe for most people?
Considered safe for cosmetic use at typical concentrations. Low irritation and comedogenic potential. No significant safety concerns reported in regulatory reviews.
Who should be careful with Bis-Hydroxypropylmethacrylate Polybutanediol/IPDI Copolymer?
Individuals with extremely dry or compromised skin barriers who may find film-formers uncomfortable
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.