Process for the production of liquid storable organic isocyanates containing carbodiimide and / or uretonimine groups and their use for the production of polyurethane plastics

摘要

Fluid and storage-stable organic isocyanates containing carbodiimide and/or uretonimine groups are prepared by partial carbodiimidisation of isocyanate groups with phospholine-type catalysts, after which the carbodiimidisation reaction is stopped by adding a silylated acid of the formula X-[Si(CH3)3]n, in which … …  X represents the neutral acid radical as it is obtained by removal of the acidic hydrogen atoms from an n-basic acid having a pKa value of not more than 3, with the exception of hydrohalic acids, and …  n represents an integer from 1 to 3. … …??These polyisocyanates are used for the preparation of polyurethane plastics.