C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/455.3
C07C 275/62 (2006.01) C07C 273/18 (2006.01) C08G 18/78 (2006.01)
Patent
CA 1315799
Mo-3004 LeA 24,908 PROCESS FOR THE PRODUCTION OF POLYISOCYANATES WITH BIURET STRUCTURES ABSTRACT OF THE DISCLOSURE Polyisocyanates with biuret structures are produced at temperatures above 250°C. More specifi- cally, an excess of a diisocyanate having aliphatically and/or cycloaliphatically bound isocyanate groups is reacted with a diamine containing aliphatically and/or cycloaliphatically bound amino groups at temperatures above 250°C for relatively brief periods of time. Water and/or polyvalent alcohols may optionally be included in the reaction mixture. The polyisocyanates with biuret structures produced by this process are characterized by good color, good dilutability with covalent solvents and comparatively low viscosity. Mo-3004
555948
K"onig Klaus
Pedain Josef
Slack William E.
Woynar Helmut
Aktiengesellschaft Bayer
K"onig Klaus
Miles Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Pedain Josef
LandOfFree
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