| abstract |
The invention relates to biuret compounds of the idealized general formula n n nin which R 1 is a (C 1 -C 22 )-alkylene, (C 3 -C 22 )-alkenylene, (C 5 -C 15 )-cycloalkylene, arylene, (C 7 -C 12 )-aralkylene, a polyoxyalkylene radical or is a polyester radical, n R 2 is a (C 1 -C 22 )-alkyl, hydroxy-(C 1 -C 22 )-alkyl, (C 3 -C 18 )-alkenyl, aryl, (C 7 -C 12 )-aralkyl, or (C 5 -C 12 )-cycloalkyl radical, a hydroxy-, (C 1 -C 22 )-alkoxy-, (C 5 -C 12 )-cyclo-alkoxy-, or (C 7 -C 12 )-aralkoxy-polyoxyalkylene radical, or a polyester radical prepared starting from a (C 1 -C 22 )-alkanol, (C 5 -C 12 )-cycloalkanol, or (C 7 -C 12 )-aralkanol or from a (C 1 -C 22 )-alkoxy-, (C 6 -C 12 )-cyclo-alkoxy-, or (C 7 -C 12 )-aralkoxy-polyoxyalkylene, Y stands for identical or different radicals O, NH, CO—NH—NH or NH—NH—CO, R 3 , R 4 and R 5 independently of one another are a (C 2 -C 40 )-alkylene, (C 3 -C 40 )-alkenylene, (C 5 -C 40 )-cyclo-alkylene, arylene, (C 7 -C 40 )-aralkylene or polyoxy-alkylene radical or are a polyester radical, R 6 is a (C 1 -C 30 )-alkyl, (C 3 -C 22 )-alkenyl, hydroxyalkyl and hydroxyalkenyl, (C 4 -C 13 )-cycloalkyl, aryl or (C 7 -C 12 )-aralkyl radical, Z stands for one or more of the following groups COO, OCO, NHCO, CONH, NHCOO, OOCNH and NHCONH, and a is a number from 1 to 19, and also to processes for preparing them and to their use for rheology control and for thixotroping coating systems, as anti-sag agents and/or as anti-settling agents. |