Polyurethane-9
Polyurethane-9 is a synthetic polymer derived from adipic acid, toluene diisocyanate, propylene glycol, ethylene glycol, and hydroxyethyl acrylate monomers (CAS# 69011-31-0). It is used in cosmetic and personal care formulations primarily as a binding and film-forming agent. It is commonly found in spot patch and similar adhesive skin-care products.
As a film-forming agent, Polyurethane-9 helps create a thin, flexible film on the skin surface, which can aid in adhesion and ingredient delivery in patch-type products. Its binding function helps hold formulation components together.
Contains toluene diisocyanate as a monomer component; residual isocyanates in polyurethane polymers may be a sensitization concern for some individuals, though the source does not explicitly detail contraindications.
