METHOD FOR PRODUCING A COMPOSITION COMPRISING POLYCARBODIIMIDE HAVING IMPROVED STORAGE STABILITY

摘要

A method for producing a composition comprising polycarbodiimide, comprising the step of the reaction of a reaction mixture which contains an aromatic polyisocyanate and a carbodiimidising catalyst, wherein, before the reaction, the aromatic polyisocyanate is treated at a temperature of ≥ 80 °C to ≤ 150 °C and a pressure of ≥ 1 mbar to ≤ 500 mbar by passing through an inert gas and/or during the reaction, the reaction mixture is treated at a temperature of ≥ 80 °C to ≤ 150 °C and a pressure of ≥ 1 mbar to ≤ 500 mbar by passing through an inert gas and wherein the content of hydrolysable chlorine in the reaction mixture is ≤ 10 ppm.