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METHOD FOR THE PRODUCTION OF LIQUID, STORAGE-STABLE CARBODIIMIDE AND / OR URETONIMIN GROUPS HAVING ORGANIC ISOCYANATES, AND THE USE THEREOF FOR THE PRODUCTION OF POLYURETHANE PLASTICS
METHOD FOR THE PRODUCTION OF LIQUID, STORAGE-STABLE CARBODIIMIDE AND / OR URETONIMIN GROUPS HAVING ORGANIC ISOCYANATES, AND THE USE THEREOF FOR THE PRODUCTION OF POLYURETHANE PLASTICS
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.
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