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Hazard Predictions

• Generates heat: Exothermic reaction at ambient temperatures (releases heat)
• Intense or explosive reaction: Reaction may be particularly intense, violent, or explosive
• Polymerization hazard: Polymerization reaction may become intense and may cause pressurization

No evidence was found for a hazardous interaction between quaternary ammonium or phosphonium salts and isocyanates. However, quaternary ammonium salts may be contaminated with traces of lower amines, which can react vigorously with isocyanates, as documented below:

Isocyanates polymerize readily, particularly with amines (Richter, R.H., R.D. Priester Jr. 2000. Isocyanates, Organic. In Kirk-Othmer Encyclopedia of Chemical Technology. John Wiley & Sons, Inc.). Contact between isocyanates and triethylphosphine may cause polymerization. (Pohanish, Richard P.; Greene, Stanley A. (2009). Wiley Guide to Chemical Incompatibilities (3rd Edition). John Wiley & Sons). Isocyanates undergo violent, rapid reactions with amines. (Pohanish, Richard P.; Greene, Stanley A. (2009). Wiley Guide to Chemical Incompatibilities (3rd Edition). John Wiley & Sons).