C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
402/141, 260/455
C07C 275/62 (2006.01) C08G 18/10 (2006.01) C08G 18/42 (2006.01) C08G 18/78 (2006.01) C08G 18/80 (2006.01)
Patent
CA 1317308
Mo-3119 LeA 25,657 PROCESS FOR THE PREPARATION OF BIURET POLYISOCYANATES, THE COMPOUNDS OBTAINED BY THIS PROCESS AND THEIR USE ABSTRACT OF THE DISCLOSURE The present invention is directed to a process for the preparation of urethane-modified biuret polyisocyanates by the reaction of a) 1,6-diisocyanatohexane with subequivalent quantities of b) biuretizing agents based on water and/or organic compounds which react with isocyanate groups to form biuret groups, to form biurets followed by removal of the unreacted, excess 1,6-diisocyanatohexane and any volatile components present, characterized in that at any stage before removal of the excess 1,6-diisocyanate, c) at least one diol containing ester groups and having an average molecular weight of about 350 to 950 is added to the reaction mixture in a quantity of about 1 to 50% by weight, based on the weight of the 1,6-diisocyanatohexane, the diol reacting with part of the isocyanate groups present to form urethane groups. The invention is also directed to the urethane-modified biuret polyisocyanates obtained by this process and their use as polyisocyanate components in two-component polyurethane lacquers. Mo-3119
584838
Pedain Josef
Schmidt Manfred
Schonfelder Manfred
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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