Polyisocyanates, a process for their preparation and their...

Details Polyisocyanates, a process for their preparation and their... Polyisocyanates, a process for their preparation and their...

C - Chemistry, Metallurgy

07

D

117/195, 260/249

C07D 251/70 (2006.01) C07D 251/48 (2006.01) C07D 251/52 (2006.01) C07D 251/54 (2006.01) C08G 18/80 (2006.01) H01B 3/30 (2006.01)

Patent

CA 2025814

Mo-3456 LeA 27,187 POLYISOCYANATES, A PROCESS FOR THEIR PREPARATION AND THEIR USE IN STOVING LACQUERS ABSTRACT OF THE DISCLOSURE This invention relates to polyisocyanates containing (i) 0.5 to 15% by weight of structural units incorporated by urea groups and corresponding to the formula Image (ii) 5 to 20% by weight of isocyanate groups (calculated as NCO) reversibly blocked with monofunctional blocking agents for isocyanate groups and (iii) 0 to 30% by weight of chemically incorporated urethane groups (calculated as NH-CO-O) other than urethane groups present in blocked isocyanate groups. The invention also relates to a process for the preparation of these polyisocyanates and to their use in combination with organic polyhydroxyl compounds as stoving compositions or for the preparation of stoving compositions for heat resistant substrates, in particular wire.

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