Blocked polyisocyanates containing amide/imide groups and...

Details Blocked polyisocyanates containing amide/imide groups and... Blocked polyisocyanates containing amide/imide groups and...

C - Chemistry, Metallurgy

08

G

C08G 18/80 (2006.01) C09D 175/04 (2006.01) H01B 3/30 (2006.01)

Patent

CA 2180320

The present invention relates to polyisocyanates containing i) 0.5 to 10 wt.% of amide and/or imide structural units (calculated as -CO-N=, MW = 42), ii) 5 to 20 wt.% of isocyanate groups (calculated as -NCO, MW = 42) blocked with blocking agents which are monofunctional in the context of the isocyanate addition reaction and iii) 0 to 30 wt.% of chemically incorporated urethane groups (calculated as -NH-CO-O-, MW = 59) obtained from the reaction of isocyanate groups with the hydroxyl groups of organic polyhydroxyl compounds. The present invention also relates to a process for the production of these lacquer polyisocyanates, their use as a binder for stoving lacquers optionally in combination with organic polyhydroxyl compounds and to their use as a binder component containing free hydroxyl groups and optionally blocked isocyanate groups by reacting and/or blending the polyisocyanates with organic polyhydroxyl compounds having a molecular weight of 62 to 350.

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