Dilinoleic Acid/Butanediol Copolymer

What is Dilinoleic Acid/Butanediol Copolymer?

Dilinoleic Acid/Butanediol Copolymer is a synthetic polyester-like polymer created by combining dilinoleic acid, a dimer derived from the unsaturated fatty acid linoleic acid found in plant oils, with 1,4-butanediol, a short-chain diol alcohol. This reaction forms long-chain molecules suitable for cosmetic formulations, particularly in makeup, hair styling, and nail products. In formulations, it functions by depositing a thin, continuous layer upon application, which adheres to skin, hair, or nails. This film provides water resistance, enhances durability against rubbing or humidity, and maintains product integrity over time. Its plasticizing properties ensure the film remains supple, avoiding stiffness or flaking, which supports smooth application and comfortable wear throughout the day.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Film former
Creates a continuous film on skin or hair to improve wear, water resistance, transfer resistance, shine, or hold in sunscreens, makeup, and styling products.
Plasticizer
Improves flexibility and reduces brittleness of films (e.g., nail coatings, hair sprays), helping prevent cracking and enhancing smooth application.

Benefits

Creates a durable film that boosts water resistance and longevity in sunscreens, makeup, and hair products.

Enhances film flexibility to prevent cracking, improving comfort in nail coatings and styling aids.

Promotes even product adhesion and shine without heaviness on skin or hair.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals seeking long-lasting makeup performance in humid conditions.
Those with known allergies to fatty acid derivatives, though rare.
Users of hair styling products needing flexible hold without stiffness.
Users preferring completely anhydrous or minimalist formulations.
People applying nail products for smooth, crack-resistant finishes.
Individuals sensitive to polymer-based films, despite low irritation evidence.

Safety Notes

  • Rated low hazard by EWG with scores of 1 across assessments.
  • Assessed safe for cosmetic use by CIR with minimal irritation potential.

Frequently Asked Questions about Dilinoleic Acid/Butanediol Copolymer

What does this copolymer do in cosmetics?

It forms flexible, water-resistant films to extend wear in makeup, hair, and nail products.

Is it safe for sensitive skin?

Evidence shows low irritation potential and EWG rating of 1, suitable for most users.

Does it cause acne?

With a comedogenic rating of 0, it does not promote pore clogging.