Process for producing isocyanates and aromatic hydroxy...

Details Process for producing isocyanates and aromatic hydroxy... Process for producing isocyanates and aromatic hydroxy...

2011-07-12

2011-07-12

Sullivan, Daniel M (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

Reexamination Certificate

active

07977504

ABSTRACT:
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.

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