Ingredient review
IPDI/PEG-15 Cocamine Copolymer Dimer Dilinoleate
INCI: IPDI/PEG-15 Cocamine Copolymer Dimer Dilinoleate
A synthetic film-former that helps makeup and sunscreen stay put longer, especially in water or sweat.
In plain English
This is a man-made polymer that creates a thin, flexible film on your skin. It's often added to sunscreens and long-wear makeup to make them more water-resistant and smudge-proof. Think of it like a clear, invisible shield that helps the product stay where you put it.
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
IPDI/PEG-15 Cocamine Copolymer Dimer Dilinoleate 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 IPDI/PEG-15 Cocamine Copolymer Dimer Dilinoleate.
- 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 by reacting isophorone diisocyanate (IPDI), PEG-15 cocamine, and dimer dilinoleate. It's a film-forming agent that dries down to a flexible, water-resistant layer on the skin.
How it works
When applied, the polymer molecules spread out and link together as the solvent evaporates, forming a continuous film. This film physically blocks water and oil from penetrating the product layer, helping active ingredients (like UV filters) stay effective longer.
Pros
Boosts water resistance
Helps sunscreens and makeup stay effective even when you sweat or swim, reducing the need for frequent reapplication.
Improves wear time
Creates a flexible film that keeps foundation, concealer, and lip products in place for hours without cracking or fading.
Cons and cautions
Can feel heavy on oily skin
The film may feel slightly tacky or occlusive, which can be uncomfortable for those with very oily or acne-prone skin.
Requires double cleansing
Because it forms a water-resistant barrier, it may not rinse off with a gentle cleanser alone, often needing an oil-based remover first.
Best for
- People who need long-wearing, water-resistant sunscreen or makeup
- Those who live in humid climates or sweat a lot
Use caution if
- People with very oily or acne-prone skin who prefer lightweight, non-film-forming products
- Those who dislike using a separate makeup remover
Usage tips
Safety summary
Considered safe for use in cosmetics at typical concentrations. The Cosmetic Ingredient Review (CIR) panel has evaluated similar film-forming polymers and found them safe when formulated properly. No significant irritation or sensitization has been reported in standard tests.
Research notes
Limited peer-reviewed studies specifically on this exact copolymer, but the class of film-forming polymers is well-studied for safety and efficacy in cosmetics. Most evidence comes from manufacturer safety data and regulatory reviews.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Sunscreens, Waterproof makeup, Long-wear foundations, Lip products
- Environmental note
- As a synthetic polymer, it is not biodegradable. However, it is used in very small amounts and is not considered a major environmental concern compared to microplastics.
Good to know
- This ingredient is often listed near the end of an ingredient list because it's used at low concentrations.
- It is not known to be a common allergen or irritant, but patch testing is always wise for new products.
Common questions
What is IPDI/PEG-15 Cocamine Copolymer Dimer Dilinoleate in beauty products?
This is a man-made polymer that creates a thin, flexible film on your skin. It's often added to sunscreens and long-wear makeup to make them more water-resistant and smudge-proof. Think of it like a clear, invisible shield that helps the product stay where you put it.
What does IPDI/PEG-15 Cocamine Copolymer Dimer Dilinoleate do in a beauty product?
When applied, the polymer molecules spread out and link together as the solvent evaporates, forming a continuous film. This film physically blocks water and oil from penetrating the product layer, helping active ingredients (like UV filters) stay effective longer.
Is IPDI/PEG-15 Cocamine Copolymer Dimer Dilinoleate safe for most people?
Considered safe for use in cosmetics at typical concentrations. The Cosmetic Ingredient Review (CIR) panel has evaluated similar film-forming polymers and found them safe when formulated properly. No significant irritation or sensitization has been reported in standard tests.
Who should be careful with IPDI/PEG-15 Cocamine Copolymer Dimer Dilinoleate?
People with very oily or acne-prone skin who prefer lightweight, non-film-forming products Those who dislike using a separate makeup remover
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.