Ingredient review
Dilinoleic Acid/Propanediol Copolymer
INCI: DILINOLEIC ACID/PROPANEDIOL COPOLYMER
A gentle film-forming polymer that helps products spread smoothly and stay put without clogging pores.
In plain English
This ingredient is a type of polymer—a long chain of molecules—made from linoleic acid (a fatty acid found in plant oils) and propanediol (a natural humectant). In skincare, it forms a thin, flexible film on the skin or hair that helps other ingredients stay in place, improves the feel of the product, and can reduce water loss. It's like a gentle, invisible shield that makes your moisturizer or sunscreen last longer and feel nicer.
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/Propanediol 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/Propanediol 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 semi-synthetic copolymer created by reacting dilinoleic acid (a dimer of linoleic acid) with propanediol. It is a clear to slightly yellow viscous liquid that is used as a film former and viscosity modifier in cosmetic formulations.
How it works
When applied, the copolymer dries to form a continuous, flexible film on the skin or hair. This film helps lock in moisture, improves the spreadability of the product, and can enhance the water resistance of sunscreens. It also thickens the product slightly, giving it a more luxurious feel.
Pros
Lightweight feel
Unlike heavy oils or waxes, this polymer forms a thin, breathable film that doesn't feel sticky or greasy on the skin.
Improves sunscreen performance
It helps sunscreens spread evenly and resist washing off with water or sweat, so you get more reliable protection.
Cons and cautions
Potential tackiness
In high concentrations or with certain other ingredients, it can leave a slightly sticky or tacky residue that some people dislike.
Limited independent research
Most safety data comes from manufacturer studies, and there are fewer peer-reviewed studies compared to more common ingredients like glycerin.
Best for
- Anyone looking for a lightweight, non-greasy film former
- People who want their sunscreen or makeup to last longer
Use caution if
- Those with very sensitive skin who prefer minimal ingredient lists
Usage tips
Safety summary
Dilinoleic Acid/Propanediol Copolymer is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, making it suitable for most skin types. As with any ingredient, patch test if you have very sensitive skin.
Research notes
Research on this specific copolymer is limited, but studies on similar film-forming polymers indicate they are safe and effective for improving product performance. The individual components (dilinoleic acid and propanediol) have strong safety profiles.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. The Cosmetic Ingredient Review (CIR) panel has not issued a specific safety monograph for this copolymer, but its components are well-studied and considered safe at typical use levels.
- Common uses
- Moisturizers, Sunscreens, Makeup primers, Hair styling products
- Environmental note
- Propanediol is typically derived from renewable sources (corn or sugar), making this ingredient more sustainable than some fully petroleum-based polymers. However, the full environmental impact of the copolymer is not well-documented.
Good to know
- Dilinoleic acid is derived from linoleic acid, an omega-6 fatty acid found in many plant oils like sunflower and safflower.
- Propanediol is a natural humectant often derived from corn or sugar, making this copolymer a more eco-friendly alternative to some petroleum-based film formers.
Common questions
What is Dilinoleic Acid/Propanediol Copolymer in beauty products?
This ingredient is a type of polymer—a long chain of molecules—made from linoleic acid (a fatty acid found in plant oils) and propanediol (a natural humectant). In skincare, it forms a thin, flexible film on the skin or hair that helps other ingredients stay in place, improves the feel of the product, and can reduce water loss. It's like a gentle, invisible shield that makes your moisturizer or sunscreen last longer and feel nicer.
What does Dilinoleic Acid/Propanediol Copolymer do in a beauty product?
When applied, the copolymer dries to form a continuous, flexible film on the skin or hair. This film helps lock in moisture, improves the spreadability of the product, and can enhance the water resistance of sunscreens. It also thickens the product slightly, giving it a more luxurious feel.
Is Dilinoleic Acid/Propanediol Copolymer safe for most people?
Dilinoleic Acid/Propanediol Copolymer is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, making it suitable for most skin types. As with any ingredient, patch test if you have very sensitive skin.
Who should be careful with Dilinoleic Acid/Propanediol Copolymer?
Those with very sensitive skin who prefer minimal ingredient lists
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.