Title:
METHOD FOR PRODUCING ISOCYANATE
Document Type and Number:
WIPO Patent Application WO/2008/059953
Kind Code:
A1
Abstract:
Disclosed is a method for stably producing an isocyanate with high yield for a long time without using phosgene. This method for producing an isocyanate does not cause the problems involved in the prior art. Specifically disclosed is a method for producing an isocyanate, which comprises a step wherein a carbamic acid ester is reacted with an aromatic hydroxy compound, thereby obtaining an aryl carbamate having a group derived from the aromatic hydroxy compound, and a step wherein the aryl carbamate is subjected to a decomposition reaction. This method for producing an isocyanate is characterized in that the aromatic hydroxy compound is anaromatic hydroxy compound represented by the formula (1) below, which has a substituent R1 at at least one ortho-position of the hydroxyl group. (In the formula, ring A represents an optionally substituted monocyclic or heterocyclic aromatic hydrocarbon ring having 6-20 carbon atoms; R1 represents a group other than a hydrogen atom, which is an aliphatic alkyl group having 1-20 carbon atoms, an aliphatic alkoxy group having 1-20 carbon atoms, an aryl group having 6-20 carbon atoms, an aryloxy group having 6-20 carbon atoms, an aralkyl group having 7-20 carbon atoms or an aralkyloxy group having 7-20 carbon atoms, each containing an atom selected from a carbon atom, an oxygen atom and a nitrogen atom; and R1 and A may combine together to form a ring structure.)
Inventors:
SHINOHATA MASAAKI (JP)
MIYAKE NOBUHISA (JP)
MIYAKE NOBUHISA (JP)
Application Number:
PCT/JP2007/072268
Publication Date:
May 22, 2008
Filing Date:
November 16, 2007
Export Citation:
Assignee:
ASAHI KASEI CHEMICALS CORP (JP)
SHINOHATA MASAAKI (JP)
MIYAKE NOBUHISA (JP)
SHINOHATA MASAAKI (JP)
MIYAKE NOBUHISA (JP)
International Classes:
C07C263/04; C07C265/14; C07C271/52; C07C271/56
Domestic Patent References:
| WO1995023484A1 | 1995-08-31 |
Foreign References:
| JP2003525267A | 2003-08-26 | |||
| JP2002500654A | 2002-01-08 | |||
| JP2001323106A | 2001-11-20 | |||
| EP0957073A1 | 1999-11-17 | |||
| JPS4627593B1 | ||||
| US3125598A | 1964-03-17 | |||
| US3992430A | 1976-11-16 | |||
| US4613466A | 1986-09-23 |
Other References:
KOSA C.S. ET AL.: "New combined phenol-hindered amine stabilizers for polymers based on diphenylmethane-4,4'-diisocyanate and dicyclohexylmethane-4,4'-diisocyanate", POLYMER DEGRADATION AND STABILITY, vol. 86, no. 3, 2004, pages 391 - 400, XP004601105
HABICHER W.D. ET AL.: "Synthesis and antioxidative properties of novel multifunctional stabilizers", JOURNAL OF VINYL & ADDITIVE TECHNOLOGY, vol. 7, no. 1, 2001, pages 4 - 18, XP008104748
KOVACIC P. ET AL.: "Reactions of tert-butylperoxy isopropyl carbonate with aromatic compounds under Friedel-Crafts conditions", JOURNAL OF ORGANIC CHEMISTRY, vol. 31, no. 8, 1966, pages 2459 - 2467, XP008104738
PETERSEN S.: "Polyurethans. V. Low-molecular conversion products of diisocyanates", ANN., vol. 562, 1949, pages 205 - 229, XP008104805
"Berchte der Deutechen Chemischen Gesellschaft", vol. 3, pages: 653
JOURNAL OF AMERICAN CHEMICAL SOCIETY, vol. 81, 1959, pages 2138
HABICHER W.D. ET AL.: "Synthesis and antioxidative properties of novel multifunctional stabilizers", JOURNAL OF VINYL & ADDITIVE TECHNOLOGY, vol. 7, no. 1, 2001, pages 4 - 18, XP008104748
KOVACIC P. ET AL.: "Reactions of tert-butylperoxy isopropyl carbonate with aromatic compounds under Friedel-Crafts conditions", JOURNAL OF ORGANIC CHEMISTRY, vol. 31, no. 8, 1966, pages 2459 - 2467, XP008104738
PETERSEN S.: "Polyurethans. V. Low-molecular conversion products of diisocyanates", ANN., vol. 562, 1949, pages 205 - 229, XP008104805
"Berchte der Deutechen Chemischen Gesellschaft", vol. 3, pages: 653
JOURNAL OF AMERICAN CHEMICAL SOCIETY, vol. 81, 1959, pages 2138
Attorney, Agent or Firm:
INABA, Yoshiyuki et al. (Roppongi Hills Mori Tower 6-10-1, Roppongi, Minato-k, Tokyo 23, JP)
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