C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/157
C08G 18/70 (2006.01) C08G 18/10 (2006.01) C08G 18/79 (2006.01) C08G 18/80 (2006.01)
Patent
CA 1320784
Mo3173 LeA 26,029 A PROCESS FOR THE PRODUCTION OF MODIFIED POLYISOCYANATES, THE POLYISOCYANATES OBTAINABLE BY THIS PROCESS AND THEIR USE AS BINDERS OR AS A BINDER COMPONENT ABSTRACT OF THE DISCLOSURE The present invention is directed to a process for the production of urethane- or isocyanurate-modified polyisocyanates based on a starting diisocyanate selected from (i) 2,4-diiso- cyanatotoluene or mixtures thereof with up to about 35%, based on the mixture, of 2,6-diisocyanatotoluene, (ii) mixtures of the diisocyanates mentioned under (i) with up to 80 NCO equivalent %, based on the mixture, of 1,6-diisocyanatohexane and (iii) 1- isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane by reacting the starting diisocyanate with substoichiometric quantities of polyhydric alcohols or trimerizing a portion of the isocyanate groups of the starting diisocyanate, removing sufficient excess, unreacted starting diisocyanate to obtain modified polyisocyanates containing at most 3% by weight, based on solids, of monomeric starting diisocyanate, characterized in that, the content of starting diisocyanate is further reduced by adding at least 15 mole-% water, based on the content of unreacted 2,4-diisocyanatotoluene or 1-isocyanato-3,3,5- trimethyl-5-isocyanatomethyl cyclohexane present, to the modified polyisocyanates. The present invention is also directed to the low-monomer polyisocyanates obtained by this process and their use as the binder component in one-component or two-component polyurethane lacquers. Mo30173
596621
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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