Process for the production of thermally color stable...

Details Process for the production of thermally color stable... Process for the production of thermally color stable...

C - Chemistry, Metallurgy

08

G

260/455.2

C08G 18/78 (2006.01) C07C 71/00 (2006.01) C07D 251/34 (2006.01) C08G 18/79 (2006.01) C08G 18/81 (2006.01)

Patent

CA 1250854

PROCESS FOR THE PRODUCTION OF THERMALLY COLOR STABLE ALIPHATIC AND/OR CYCLOALIPHATIC DIISOCYANATES AND THE USE THEREOF FOR THE PRODUCTION OF MODIFIED POLYISO- CYANATES HAVING IMPROVED COLOR PROPERTIES ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the production of aliphatic and/or cycloaliphatic diiso- cyanates which are color stable to heat, which is characterized in that a diisocyanate with aliphatically- and/or cycloaliphatically-bound isocyanate groups is heated in the presence of about 0.1 to 3% by weight, based on the diisocyanate, of at least one compound which is soluble in the diisocyanate and contains at least 3% by weight of structural units corresponding to the formula: Image , for up to about 5 hours at a temperature of about 100 to 220°C and the diisocyanate which has been treated in this way is subsequently purified by distillation. The present invention also relates to the use of the products of the present process for the production of modified polyisocyanates having improved coloration.

494058

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