Polybutylene Glycol/Mdi Copolymer

What is Polybutylene Glycol/Mdi Copolymer?

Polybutylene Glycol/MDI Copolymer is a synthetic polyurethane-based polymer created by reacting polybutylene glycol, a polyether diol, with methylene diphenyl diisocyanate (MDI), a diisocyanate compound. This results in a flexible, elastic copolymer commonly incorporated into cosmetics like sunscreens, makeup foundations, mascaras, and hair styling sprays. In formulations, it acts by depositing a thin, continuous polymeric film upon application and drying. This film adheres to the skin or hair, offering mechanical properties such as flexibility and durability. It helps products withstand rubbing, sweat, or water exposure while maintaining coverage, color intensity, or style hold without feeling heavy or occlusive. The ingredient's structure allows it to form coherent layers that enhance product performance across various cosmetic categories.

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.

Benefits

Provides a flexible film that extends makeup or sunscreen wear time.

Boosts water and transfer resistance in applied products.

Supports shine and hold in hair styling formulations.

Who It's For

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

Who May Benefit Who Should Avoid
People seeking long-lasting makeup during active days.
Those with known sensitivities to polyurethane polymers.
Individuals using water-resistant sunscreens for outdoor activities.
People experiencing reactions to film-forming agents in cosmetics.
Users of hair products needing strong, flexible hold.
Individuals preferring minimalist formulas without synthetic polymers.

Safety Notes

  • Considered safe for cosmetic use with low concern for irritation or sensitization.
  • Non-comedogenic, unlikely to clog pores.

Frequently Asked Questions about Polybutylene Glycol/Mdi Copolymer

What does Polybutylene Glycol/MDI Copolymer do in products?

It forms a flexible film to improve wear, water resistance, and hold in makeup, sunscreens, and hair products.

Is it safe for sensitive skin?

It has low irritation potential and is generally well-tolerated in cosmetics.

Does it cause breakouts?

Rated non-comedogenic, so it is unlikely to contribute to clogged pores.