Organic compounds -- part of the class 532-570 series – Organic compounds – Isocyanate esters
Reexamination Certificate
2007-06-20
2008-09-09
Puttlitz, Karl J (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Isocyanate esters
Reexamination Certificate
active
07423171
ABSTRACT:
A one-pot process for the synthesis of isocyanates, polyisocyanates or mixtures thereof which includes the steps of:i. preparing a mixture comprising an amine, an alcohol, an oxygen-containing gas, carbon monoxide, a metal complex catalyst selected from the group consisting of macrocyclic complex catalysts and cobalt Shiff base catalysts; and a solvent selected from the group consisting of aliphatic or aromatic halocarbons, perhalogenated alcohols, halogenated ethers, halogenated ketones, perfluorinated hydrocarbons, polymers of chlorotrifluoroethylene having the formula —(CF2—CFCl)nwherein n is between 2 and 10, and mixtures thereof;ii. subjecting the resulting mixture to a first heating under pressure;iii. cooling and depressurizing the mixture resulting from the previous step; andiv. subjecting the mixture of the previous step to a second heating to separate out the isocyanate product from the mixture.
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Aghmiz Ali
Almena Munoz Beatriz
Cabrero Carmen Claver
Carnero Pilar Salagre
Castillon Miranda Sergio
Hultquist Steven J.
Intellectual Property / Technology Law
Puttlitz Karl J
Repsol YPF, S.A.
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