Water soluble or dispersible blocked polyisocyanates and a...

Details Water soluble or dispersible blocked polyisocyanates and a... Water soluble or dispersible blocked polyisocyanates and a...

C - Chemistry, Metallurgy

09

D

117/195, 260/455

C09D 175/12 (2006.01) C07D 251/34 (2006.01) C08G 18/08 (2006.01) C08G 18/62 (2006.01) C08G 18/78 (2006.01) C08G 18/79 (2006.01) C08G 18/80 (2006.01)

Patent

CA 1309722

Mo-3092 LeA 25,571 WATER SOLUBLE OR DISPERSIBLE BLOCKED POLYISOCYANATES AND A PROCESS FOR THEIR PREPARATION AND USE ABSTRACT OF THE DISCLOSURE The present invention is directed to water soluble or dispersible blocked polyisocyanates which contain a) a statistical average per molecule of at least one structural unit corresponding to the formula: B-CO-NH- wherein B denotes a group obtainable by removal of the acidic hydrogen atom from a monofunctional blocking agent for organic isocyanates and b) structural units corresponding to the formula -NH-CO-?-CN in a quantity sufficient to ensure the solubility or dispersibility of the blocked polyisocyanates in water, the blocked polyisocyanates containing on statistical average a total of at least two structural units corre- sponding to the formulae a) and b) per molecule. The present invention also relates to a process for the preparation of these blocked polyisocyanates and to their use in combination with water soluble or dispersible organic compounds containing at least two isocyanate-reactive groups for the production of coated substrates which are cured by heating. Mo-3092

580272

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