C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/455, 260/637
C07C 31/02 (2006.01) C07C 31/08 (2006.01) C07C 119/042 (1980.01)
Patent
CA 1178968
ABSTRACT OF THE DISCLOSURE Polyisocyanates are prepared by thermally splitting a carbamate corresponding to the formula: R1(NH-CO-O-R2)n in which R1, R2 and n are as defined herein into the corresponding isocyanate and alcohol. The split- ting reaction is carried out at a temperature of from 150 to 350°C, at a pressure of from 0.0001 to 20 bar and in the presence of an auxiliary agent. Suitable auxil- iary agents are hydrogen chloride, organic acid chlor- ides, compounds having an alkylating effect and organotin (IV) chlorides. Inert solvents and catalysts may also be employed in the splitting products. The thus-produced isocyanate and alcohol are then separated, if necessary.
396458
Becker Gernot
Engbert Theodor
Hammen Gunther
K"onig Klaus
Sundermann Rudolf
Aktiengesellschaft Bayer
Marcoux & Sher Swabey Mitchell Houle
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