Isocyanate production process using composition containing carbamic acid ester and aromatic hydroxy compound, and composition for transfer and storage of carbamic acid ester

Patent metadata

Field	Value
Publication number	US-9637445-B2
Application number	US-201514705545-A
Country	US
Kind code	B2
Filing date	May 6, 2015
Priority date	Mar 30, 2007
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

An object of the present invention is to provide an isocyanate production process, which is free of the various problems found in the prior art, and which uses a composition containing a carbamic acid ester and an aromatic hydroxy compound when producing isocyanate without using phosgene, as well as a carbamic acid ester composition for transferring or storing carbamic acid ester. The present invention discloses an isocyanate production process including specific steps and using a composition containing a carbamic acid ester and an aromatic hydroxy compound, as well as a composition for transfer or storage of carbamic acid ester comprising the carbamic acid ester and the specific aromatic hydroxy compound.

First claim

We claim:

1. A composition for transfer and storage of a carbamic acid ester comprising:
a carbamic acid ester; and
an aromatic hydroxy compound,

wherein:
when the number of moles of an ester group constituting the carbamic acid ester is defined as A, and the number of moles of the aromatic hydroxy compound is defined as B, then a ratio of B to A is within a range of from 0.1 to 50,
a melting point of the carbamic acid ester is 200° C. or lower, and
a melting point of the aromatic hydroxy compound is 190° C. or lower,

wherein the carbamic acid ester is a compound represented by formula (17):

where R 7 is an aliphatic group having 1 to 20 carbon atoms and containing atoms selected from carbon atoms and oxygen atoms;
R 11 is an aliphatic group having 1 to 10 carbon atoms or an aromatic group having 6 to 20 carbon atoms, where the aliphatic group and the aromatic group contain atoms selected from carbon atoms and oxygen atoms; and
n is an integer from 2 to 10.

Assignees

• Asahi Kasei Chemicals Corp

Inventors

• Shinohata Masaaki
• Miyake Nobuhisa

Classifications

• C07C263/04 Primary

  from or via carbamates or carbamoyl halides · CPC title

• C07C271/24

  with the nitrogen atom of at least one of the carbamate groups bound to a carbon atom of a ring other than a six-membered aromatic ring · CPC title

• C07C269/08

  Separation; Purification; Stabilisation; Use of additives · CPC title

• C07C271/20

  to carbon atoms of hydrocarbon radicals substituted by nitrogen atoms not being part of nitro or nitroso groups · CPC title

• C07C265/14

  containing at least two isocyanate groups bound to the same carbon skeleton · CPC title