C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 263/04 (2006.01) C07C 265/14 (2006.01) C08G 64/42 (2006.01) C08G 69/44 (2006.01) C08J 11/28 (2006.01)
Patent
CA 2705874
An object of the present invention is to provide a process for producing isocyanates, which are industrially useful compounds, without using phosgene, and to provide a process for chemically recycling waste polycarbonate resin. The present invention discloses a process enabling isocyanate compounds to be produced without using phosgene as a raw material by subjecting a carbamic acid ester compound obtained by a reaction between an aromatic polycarbonate resin and an amine compound to a thermal decomposition reaction, while at the same time disclosing a process enabling chemical recycling of aromatic polycarbonate resin by recovering a divalent aromatic hydroxy compound forming aromatic polycarbonates.
L'objectif est de proposer un procédé de fabrication d'un isocyanate (qui est un composé industriellement utile) sans utiliser de phosgène, ainsi que de proposer un procédé de recyclage chimique pour un déchet de résine de polycarbonate. L'invention porte sur un procédé qui permet de fabriquer un composé isocyanate sans utiliser de phosgène comme matière de départ par la décomposition thermique d'un composé ester d'acide carbamique obtenu par la réaction entre une résine de polycarbonate aromatique et un composé amine, et qui permet également le recyclage chimique de la résine de polycarbonate aromatique d'une manière telle qu'un composé hydroxylé aromatique divalent constituant le polycarbonate aromatique est recueilli.
Miyake Nobuhisa
Shinohata Masaaki
Asahi Kasei Chemicals Corporation
Goudreau Gage Dubuc
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