Method for producing a composition comprising polycarbodiimide having improved storage stability
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United States of America Patent
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Apr 28, 2020
Grant Date -
Jan 11, 2018
app pub date -
Feb 25, 2016
filing date -
Feb 26, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
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.
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