Ingredient review
Dilinoleic Acid/Butanediol Copolymer
INCI: DILINOLEIC ACID/BUTANEDIOL COPOLYMER
A gentle, plant-derived film former that helps makeup and sunscreen last longer without clogging pores or irritating skin.
In plain English
This ingredient is a polymer, which is a long chain of molecules that forms a thin, flexible film on your skin. Think of it like a very light, invisible glove that helps the other ingredients in your product stay in place and not rub off easily. It's made from linoleic acid (a fatty acid found in plant oils) and butanediol (a common skincare alcohol), so it's considered gentle and non-irritating.
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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Dilinoleic Acid/Butanediol 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 Dilinoleic Acid/Butanediol 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 polymer created by reacting dilinoleic acid (derived from plant oils like sunflower or safflower) with butanediol. The result is a polyester-like molecule that forms a smooth, water-resistant film when applied to skin.
How it works
When you apply a product containing this copolymer, the water or solvent evaporates, leaving behind a thin, flexible film. This film helps other ingredients (like sunscreen filters or pigments) adhere to the skin more evenly and for longer. It also gives a silky, non-greasy feel and can help control the thickness of a formula.
Pros
Long-lasting wear
Helps makeup and sunscreen stay put for hours, reducing the need for frequent touch-ups or reapplication.
Gentle on skin
Derived from plant oils and has a very low irritation and comedogenic rating, making it suitable for sensitive and acne-prone skin.
Cons and cautions
Not moisturizing
It forms a film but doesn't add hydration or oils, so it's best paired with moisturizing ingredients underneath.
Potential tightness
In high concentrations or on very dry skin, the film can feel slightly tight or stiff, similar to a light mask.
Best for
- Anyone looking for longer-lasting makeup or sunscreen
- People with oily or combination skin who want a matte finish
Use caution if
- Those with extremely dry or dehydrated skin who prefer rich, emollient textures
Usage tips
Safety summary
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic risk. No known significant safety concerns from regulatory bodies.
Research notes
Limited peer-reviewed studies specifically on this copolymer, but it is structurally similar to other safe film-forming polyesters used in cosmetics for decades. Safety is supported by industry-wide use and regulatory approvals.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics globally, including by the FDA (as a cosmetic ingredient) and under EU cosmetics regulation.
- Common uses
- Sunscreens, Foundations, Long-wear makeup, Moisturizers
- Environmental note
- Derived from renewable plant oils, but as a synthetic polymer it may not be biodegradable. Check product packaging for environmental claims.
Good to know
- Often listed as 'Polyester-5' on some ingredient labels.
- Commonly found in 'long-wear' or '24-hour' makeup products.
Common questions
What is Dilinoleic Acid/Butanediol Copolymer in beauty products?
This ingredient is a polymer, which is a long chain of molecules that forms a thin, flexible film on your skin. Think of it like a very light, invisible glove that helps the other ingredients in your product stay in place and not rub off easily. It's made from linoleic acid (a fatty acid found in plant oils) and butanediol (a common skincare alcohol), so it's considered gentle and non-irritating.
What does Dilinoleic Acid/Butanediol Copolymer do in a beauty product?
When you apply a product containing this copolymer, the water or solvent evaporates, leaving behind a thin, flexible film. This film helps other ingredients (like sunscreen filters or pigments) adhere to the skin more evenly and for longer. It also gives a silky, non-greasy feel and can help control the thickness of a formula.
Is Dilinoleic Acid/Butanediol Copolymer safe for most people?
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic risk. No known significant safety concerns from regulatory bodies.
Who should be careful with Dilinoleic Acid/Butanediol Copolymer?
Those with extremely dry or dehydrated skin who prefer rich, emollient textures
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.