Title:
イソシアネートの製造方法
Document Type and Number:
Japanese Patent JP4859255
Kind Code:
B2
Abstract:
An object of the present invention is to provide a process that enables isocyanates to be stably produced over a long period of time at high yield without encountering various problems as found in the prior art when producing isocyanates without using phosgene. The present invention discloses a process for producing an isocyanate, comprising the steps of: reacting a carbamic acid ester and an aromatic hydroxy compound to obtain an aryl carbamate having a group derived from the aromatic hydroxy compound; and subjecting the aryl carbamate to a decomposition reaction, wherein the aromatic hydroxy compound is an aromatic hydroxy compound which is represented by the following formula (1) and which has a substituent R 1 at at least one ortho position of a hydroxyl group:
(wherein ring A represents an aromatic hydrocarbon ring in a form of a single or multiple rings which may have a substitute and which have 6 to 20 carbon atoms;
R 1 represents a group other than a hydrogen atom in a form of an aliphatic alkyl group having 1 to 20 carbon atoms, an aliphatic alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms or an aralkyloxy group having 7 to 20 carbon atoms, the group containing an atom selected from a carbon atom, an oxygen atom and a nitrogen atom; and R 1 may bond with A to form a ring structure).
Inventors:
Shinohata Masaaki
Nobuhisa Miyake
Nobuhisa Miyake
Application Number:
JP2008544205A
Publication Date:
January 25, 2012
Filing Date:
November 16, 2007
Export Citation:
Assignee:
Asahi Kasei Chemicals Corporation
International Classes:
C07C263/04; C07C265/14; C07C269/00; C07C271/20; C07C271/52
Domestic Patent References:
| JP2003525267A | 2003-08-26 | |||
| JP2002500654A | 2002-01-08 | |||
| JP2001323106A | 2001-11-20 | |||
| JP2003519079A | 2003-06-17 | |||
| JPS4627593B1 |
Foreign References:
| US3125598A | 1964-03-17 |
Attorney, Agent or Firm:
Yoshiyuki Inaba
Toshifumi Onuki
Kazuhiko Naito
Toshifumi Onuki
Kazuhiko Naito