Ingredient review
Glycerin/Phthalic Acid Copolymer
INCI: GLYCERIN/PHTHALIC ACID COPOLYMER HYDROXYPROPYL C9-11 ISOALKYL ACIDATE
A synthetic film-former that helps products stay put, but its phthalate-related name may raise unnecessary concern.
In plain English
This ingredient is a synthetic polymer (a type of plastic-like molecule) that forms a thin, flexible film on your skin. It's used in products like sunscreen and long-wear makeup to help them resist water and last longer. Despite its name containing 'phthalic acid,' it is not the same as the controversial phthalates you may have heard about in plastics. This ingredient is considered safe for cosmetic use at typical levels.
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
Glycerin/Phthalic Acid 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 Glycerin/Phthalic Acid 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 glycerin and phthalic acid, modified with hydroxypropyl and C9-11 isoalkyl groups to improve its film-forming and water-resistant properties.
How it works
When applied to the skin, the copolymer dries down to form a continuous, flexible film. This film helps other ingredients (like UV filters or pigments) adhere better and resist being washed off by water or sweat.
Pros
Enhances 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 and eye makeup in place for hours without flaking or creasing.
Cons and cautions
Name confusion
The word 'phthalic' in the name can be alarming, but this ingredient is not related to the harmful phthalates found in some plastics.
Not eco-friendly
As a synthetic polymer, it is not biodegradable and may contribute to microplastic pollution when washed off.
Best for
- People who need long-wearing or water-resistant makeup
- Those who use water-resistant sunscreens for outdoor activities
Use caution if
- Anyone seeking a fully natural or biodegradable skincare routine
Usage tips
Safety summary
Considered safe for cosmetic use at typical concentrations. The ingredient is not related to harmful phthalates. Rare reports of mild skin irritation exist, but overall risk is low.
Research notes
Limited independent research on this specific copolymer. Safety is inferred from its chemical class and regulatory approvals. No known human or animal studies on long-term effects.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and other major markets. The EU CosIng database lists it as a film former with no specific restrictions.
- Common uses
- Sunscreens, Waterproof makeup, Long-wear foundations
- Environmental note
- As a synthetic polymer, it is not readily biodegradable. Choosing products with biodegradable film-formers can reduce environmental impact.
Good to know
- This ingredient is often found in 'water-resistant' or 'long-wear' labeled products.
- Despite the similar name, it is chemically different from phthalates used as plasticizers.
Common questions
What is Glycerin/Phthalic Acid Copolymer in beauty products?
This ingredient is a synthetic polymer (a type of plastic-like molecule) that forms a thin, flexible film on your skin. It's used in products like sunscreen and long-wear makeup to help them resist water and last longer. Despite its name containing 'phthalic acid,' it is not the same as the controversial phthalates you may have heard about in plastics. This ingredient is considered safe for cosmetic use at typical levels.
What does Glycerin/Phthalic Acid Copolymer do in a beauty product?
When applied to the skin, the copolymer dries down to form a continuous, flexible film. This film helps other ingredients (like UV filters or pigments) adhere better and resist being washed off by water or sweat.
Is Glycerin/Phthalic Acid Copolymer safe for most people?
Considered safe for cosmetic use at typical concentrations. The ingredient is not related to harmful phthalates. Rare reports of mild skin irritation exist, but overall risk is low.
Who should be careful with Glycerin/Phthalic Acid Copolymer?
Anyone seeking a fully natural or biodegradable skincare routine
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.