WO1999047493A1 - Method for the preparation of organic carbamates - Google Patents
Method for the preparation of organic carbamates Download PDFInfo
- Publication number
- WO1999047493A1 WO1999047493A1 PCT/EP1999/001693 EP9901693W WO9947493A1 WO 1999047493 A1 WO1999047493 A1 WO 1999047493A1 EP 9901693 W EP9901693 W EP 9901693W WO 9947493 A1 WO9947493 A1 WO 9947493A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- organic
- catalyst
- carbamates
- reaction
- carbonate
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C263/00—Preparation of derivatives of isocyanic acid
- C07C263/04—Preparation of derivatives of isocyanic acid from or via carbamates or carbamoyl halides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C269/00—Preparation of derivatives of carbamic acid, i.e. compounds containing any of the groups, the nitrogen atom not being part of nitro or nitroso groups
- C07C269/04—Preparation of derivatives of carbamic acid, i.e. compounds containing any of the groups, the nitrogen atom not being part of nitro or nitroso groups from amines with formation of carbamate groups
Definitions
- the present invention relates to a method for the preparation of organic carbamates by reaction of amines with organic carbonates.
- US-A 5.347.034 discloses a process for producing poly(O-alkylurethanes) of the diphenylmethane series by reacting the corresponding amines with dialkyl carbonates in the presence of a catalyst, such that the formed poly(O-alkylurethanes) crystallize out in a highly pure form upon cooling.
- the production of the O-ethylcarbamate of TDI is described in EP-A 520.273.
- EP-A 391.473 describes a process for producing carbamates using reduced amounts of catalyst by first reacting an amine with a (cyclo)alkyl carbonate in the presence of a carbamation catalyst to produce a mixture of a carbamate and an urea, further reacting the urea with carbonate to produce the corresponding carbamate, and finally recovering the carbamate from the reaction mixture.
- US-A 4.268.684 discloses a method for the preparation of carbamates by reacting an organic carbonate with an aromatic amine in the presence of certain zinc, tin or cobalt salts which are only active at temperatures of at least 200° C whereas in US-A 4.268.683 zinc or tin salts are used which are soluble in the reaction mixture at the reaction conditions.
- EP-A 48.371 describes the preparation of N,O-disubstituted urethanes by reacting primary amines with dialkylcarbonates in the presence of neutral or basic inorganic or organic lead, titanium zinc or zirconium compounds. 2
- the preparation of aliphatic carbamates using a sodium methoxide catalyst is disclosed in e.g. US-A 5.138.015 and US-A 5.315.034.
- EP-A 752.414 concerns a process for the preparation of aromatic urethanes in the presence of a zinc and/or copper carbonate hydroxide catalyst.
- carbamates are prepared by heating an organic carbonate and an aromatic amine in the presence of aluminum as catalyst and a promoter comprising a combination of iodine and a mercury salt.
- carbamates can advantageously be prepared by reacting specific organic carbonates with amines.
- the invention thus concerns a method for the preparation of carbamates comprising reacting amines with heteroatom-substituted alkyl carbonates.
- the method of the present invention allows for the production of carbamates under mild reaction conditions, i.e. relatively low temperatures and pressures.
- Typical examples of suitable carbonates are bis(2-isopropoxyethyl) carbonate,bis(l ,3-dimethoxy-2-propyl)carbonate,bis(l , 1 ,-dimethoxy-2-ethyl)carbonate,bis (2-methoxy-l-propyl)carbonate,bis(2-methoxy-3-butyl)carbonate,bis(l-ethoxycyclopropy l)carbonate, bis(N,N-dimethylaminoethyl)carbonate, bis(2,2,2-trifluoroethyl)carbonate, bis(2,2,2-trichloroethyl)carbonate,bis(l,l,l,3,3,3-hexafluoroisopropyl)carbonate,bis(nonaf luorotert.butyl)carbonate, bis(fluorophenyl)carbonates, bis (chlorophenyl)carbonates and polysubstituted halogenated phenylcarbon
- Fluorine-containing carbonates such as bis (l,l,l,3,3,3-hexafluoroisopropyl)carbonate,bis (2,2,2-trifluoroethyl)carbonate or bis(nonafluorotert.butyl)carbonate, are preferred.
- Amine compounds which can be used in the present method include aliphatic, cycloaliphatic or aromatic mono-, di- or polyamines.
- Suitable amines according to the process of the invention include, for example, methylamine, ethylamine, n-propylamine, isopropylamine, n-butylamine, isobutylamine, hexylamine, cyclopropylamine, cyclobutylamine, cyclohexylamine, laurylamine, stearylamine, phenylamine, 4-chlorophenyl amine, 2- fluorophenyl amine, 3,4-dichlorophenylamine, aniline, benzylamine, tolylamine, diisopropyl phenylamine, 2,4'-diaminodiphenylmethane,4,4'-diaminodiphenylmethane,2,2'-diaminodiphenylmethan e and higher homologs (polyaminopolyphenylmethanes), 2,4-toluenediamine, 2,6-toluen
- aromatic di- or polyamines like toluenediamines, diaminodiphenylmethanes or polyaminopolyphenylmethanes or any mixtures thereof.
- the polyamines and the organic carbonates may be reacted in stoichiometric quantities.
- the method of the present invention may be carried out in the presence of a catalyst.
- a catalyst Preferred are heterogeneous metal based catalysts, such as organic metal salts on an inert carrier support or metal based catalysts which form a metal compound which is present as a precipitate during or after completion of the reaction.
- Organic or inorganic salts which may used include, for example, acetates, chlorides, propionates, isopropanoates, butanoates, 2-ethylhexanoates, n-octoates, isononanoates, benzoates, chlorobenzoates, naphthenates, stearates, itaconates, pivalates, phenolates, acetylacetonates, alkoxides, C 16 /C 18 -alkenylsuccinoates (ASA), C I2 -alkenylsuccinoates (DSA) and the like.
- ASA alkoxides
- DSA C I2 -alkenylsuccinoates
- alkanoates having from 1 to 15 carbons atoms. 4
- Suitable catalysts include, for example, zinc catalysts such as zinc chloride, zinc acetate, zinc propionate, zinc octoate, zinc benzoate, zinc p-chlorobenzoate, zinc naphthenate, zinc stearate, zinc itaconate, zinc pivalate, zinc phenolate, zinc acetylacetonate, zinc methoxide, lead catalysts like lead acetate and lead octoate, and tin catalysts like stannous chloride, stannous octoate, and mixtures thereof.
- zinc catalysts such as zinc chloride, zinc acetate, zinc propionate, zinc octoate, zinc benzoate, zinc p-chlorobenzoate, zinc naphthenate, zinc stearate, zinc itaconate, zinc pivalate, zinc phenolate, zinc acetylacetonate, zinc methoxide, lead catalysts like lead acetate and lead octoate, and tin catalysts like stannous
- the metal in the catalyst is selected from the group consisting of Ti, Zr, Mn, Fe, Co, Ni, Cu, Zn, Sn, Pb, Bi and Cd.
- the heterogeneous metal based catalyst on the carrier may be made by impregnating the catalyst with or precipitating it on the carrier.
- Suitable inert carrier supports include, for example, alumina, silica, TiO 2 , clays, zeolites, resins, graphite and carbon.
- a preferred carrier comprises TiO
- the catalyst is generally used in amounts between 10 "3 and 20 mole% based on the amount of amines used.
- reaction conditions largely depend on the type of reactants used.
- the method may be carried out at atmospheric or superatmospheric pressures.
- the pressure is preferably not more than 20 bar.
- reaction time is dependent on the temperature and on the type and quantity of the carbamate compound, but will normally be between 0.5 and 6 hours. Reaction times of less than 4 hours are common, and reaction times of not more than 3 hours have been achieved without any problem.
- reaction temperature will be between 20 and 300°C.
- method of the invention is carried out at temperatures between 50 and 200°C. 5
- Any solvent or mixture of solvents which is inert to the reactants under the reaction conditions may be employed.
- Suitable solvents which may be employed include, for example, aromatic hydrocarbons such as benzene, halogenated aromatic hydrocarbons such as monochlorobenzene, ortho-dichlorobenzene or 1-chloronaphthalene, alkylated aromatic hydrocarbons like toluene, xylene, ethylbenzene, cumene or tetrahydronaphthalene, other functionalised aromatic hydrocarbons such as anisol, diphenylether, ethoxybenzene, benzonitrile, 2-fluoroanisole, 2,3-dimethylanisole or trifluorotoluene, alkanes such as n-pentane, n-hexane, n-heptane or higher or branched alkanes, cyclic alkanes like cyclopentane, cyclohexane or derivatives thereof, halogenated alkanes like chloroform, dichloromethane, carbontetrach
- the alcohol which is released by the reaction of the carbonate with the amine may also advantageously be used as the solvent.
- the invention relates to the preparation of organic isocyanates by thermolysis of the organic carbamates thus prepared.
- thermolysis may be carried out solvent-free or in the presence of a solvent. If a solvent is present, it may be the same as that used for the production of the carbamates.
- thermolysis reaction conditions such as temperature and pressure, will depend on the type of carbamate and on whether a solvent is present or not. 6 In the solvent-free method the temperature will preferably be between the melting point of the starting carbamate and 350°C.
- the preferred temperature is between 50 and 200° C, and more preferably between 120 and 190°C.
- thermolysis may be carried out at atmospheric pressure, preferably under nitrogen.
- the reaction preferably takes place under reduced pressure.
- the pressure is preferably reduced to between lO ⁇ and 50 mbar.
- the synthesis and optional thermolysis of the organic carbamates can be conducted in any apparatus which can be equipped, if required, with agitation means and heating and/or cooling means to keep the temperature within the desired range.
- the method of the present invention may be conducted batchwise or as a semi-continuous or continuous process.
- One type of continuous operation is in a fluidized bed reactor in which a catalyst is carried into the reactor as a slurry in one or more of the reactants. Still another way of operating continuously is in a moving bed reactor in which the catalyst bed and the reactants pass concurrently or countercurrently to each other.
- a preferred type of continuous operation however is in a fixed bed reactor in which the reactants are passed over the catalyst bed.
- thermolysis alcohols are formed as by-product. These can be removed from the reaction mixture either continuously during or after completion of the reaction by e.g. distillation. 7
- the isocyanates and alcohols thus obtained are generally of high purity and no additional treatment is required to further purify said products. Only the solvent, if present, needs to be removed.
- reaction products formed may be subjected to known purification methods, such as filtration, extraction, recrystallisation or distillation.
- diaminodiphenylmethane Into a suitable flask equipped with a condenser and a thermometer, 0.1 g of diaminodiphenylmethane are dissolved in 1 g of 1,1,1,3,3,3-hexafluoro isopropanol. When the amine is dissolved, 3.5 g of bis(l, 1,1,3,3,3- hexafluoroisopropyl)carbonate is added. This mixture is heated to reflux temperature (76°C) and stirred for 3 hours at this temperature. To the carbamate formed in this way, 5 g of ortho-dichlorobenzene (ODCB) are added. The mixture is heated and addition of monochlorobenzene (MCB) is started.
- ODCB ortho-dichlorobenzene
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99915615A EP1093452A1 (en) | 1998-03-17 | 1999-03-16 | Method for the preparation of organic carbamates |
AU34127/99A AU3412799A (en) | 1998-03-17 | 1999-03-17 | Method for the preparation of organic carbamates |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98104775.6 | 1998-03-17 | ||
EP98104775 | 1998-03-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999047493A1 true WO1999047493A1 (en) | 1999-09-23 |
Family
ID=8231601
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/001693 WO1999047493A1 (en) | 1998-03-17 | 1999-03-16 | Method for the preparation of organic carbamates |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1093452A1 (en) |
AU (1) | AU3412799A (en) |
WO (1) | WO1999047493A1 (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001056977A1 (en) * | 2000-02-03 | 2001-08-09 | Enichem S.P.A. | Integrated process for the preparation of aromatic isocyanates and procedures for effecting the relative intermediate phases |
WO2002024634A2 (en) * | 2000-09-19 | 2002-03-28 | Arco Chemical Technology, L.P. | Non-phosgene route to the manufacture of organic isocyanates |
ES2187241A1 (en) * | 2000-06-01 | 2003-05-16 | Repsol Quimica Sa | Isocyanate production procedure |
WO2007015852A2 (en) * | 2005-07-20 | 2007-02-08 | Dow Global Technologies Inc. | Heterogeneous supported catalytic carbamate process |
EP1870398A1 (en) * | 2006-06-20 | 2007-12-26 | Repsol Ypf S.A. | One-pot catalytic process for the synthesis of isocyanates |
EP1870397A1 (en) * | 2006-06-20 | 2007-12-26 | Repsol Ypf S.A. | One-pot catalytic process for the synthesis of isocyanates and installations for the same |
CN100408557C (en) * | 2003-08-26 | 2008-08-06 | 河北工业大学 | Method for preparing 2,4-toluene diamino menthyl formate |
EP2036884A1 (en) | 2007-09-14 | 2009-03-18 | Repsol Ypf S.A. | Process for producing fluorinated isocyanates and carbamates |
WO2009098327A1 (en) * | 2008-02-06 | 2009-08-13 | Repsol Ypf, S.A. | Method for producing fluorinated carbamates and isocyanates with heterogeneous catalysts |
ES2331505A1 (en) * | 2008-07-04 | 2010-01-05 | Universidad Politecnica De Valencia | Preparation of carbamates with solid catalysts |
WO2010020621A1 (en) * | 2008-08-22 | 2010-02-25 | Basf Se | Method for producing urethanes composed of di-functional aromatic amines and dialkyl carbonates |
EP2199278A1 (en) | 2008-12-19 | 2010-06-23 | Dow Global Technologies Inc. | Process for the Production of Aromatic Urethanes |
ES2345028A1 (en) * | 2009-03-10 | 2010-09-13 | Universidad Politecnica De Valencia | One-pot production of carbamates using solid catalysts |
US20120203022A1 (en) * | 2009-10-21 | 2012-08-09 | Basf Se | Method for producing urethanes |
CN103980160A (en) * | 2014-05-08 | 2014-08-13 | 南京工业大学 | Synthetic method of isophorone diamino methyl formate |
US8927756B2 (en) | 2010-04-02 | 2015-01-06 | Asahi Glass Company, Limited | Method for producing carbamate compound, carbamate compound, and method for producing isocyanate compound using same |
WO2019185608A1 (en) | 2018-03-28 | 2019-10-03 | Covestro Deutschland Ag | Heterogeneous catalysts for the synthesis of carbamates |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0048371A2 (en) * | 1980-09-19 | 1982-03-31 | Bayer Ag | Process for the preparation of N,O-disubstituted urethanes |
EP0520273A2 (en) * | 1991-06-27 | 1992-12-30 | Bayer Ag | Process for the preparation of bis(ethoxycarbonylamino) toluols and their use in the preparation of diisocyanato toluols |
-
1999
- 1999-03-16 EP EP99915615A patent/EP1093452A1/en not_active Withdrawn
- 1999-03-16 WO PCT/EP1999/001693 patent/WO1999047493A1/en not_active Application Discontinuation
- 1999-03-17 AU AU34127/99A patent/AU3412799A/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0048371A2 (en) * | 1980-09-19 | 1982-03-31 | Bayer Ag | Process for the preparation of N,O-disubstituted urethanes |
EP0520273A2 (en) * | 1991-06-27 | 1992-12-30 | Bayer Ag | Process for the preparation of bis(ethoxycarbonylamino) toluols and their use in the preparation of diisocyanato toluols |
Non-Patent Citations (1)
Title |
---|
HEINER ECKERT ET AL.: "Triphosgene, a Crystalline Phosgene Sustitute", ANGEWANDTE CHEMIE. INTERNATIONAL EDITION., vol. 26, no. 9, 1987, WEINHEIM DE, pages 894 - 895, XP002083416 * |
Cited By (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6992214B2 (en) * | 2000-02-03 | 2006-01-31 | Dow Global Technologies Inc. | Integrated process for the preparation of aromatic isocyanates and procedures for effecting the relative intermediate phases |
WO2001056977A1 (en) * | 2000-02-03 | 2001-08-09 | Enichem S.P.A. | Integrated process for the preparation of aromatic isocyanates and procedures for effecting the relative intermediate phases |
ES2187241A1 (en) * | 2000-06-01 | 2003-05-16 | Repsol Quimica Sa | Isocyanate production procedure |
WO2002024634A2 (en) * | 2000-09-19 | 2002-03-28 | Arco Chemical Technology, L.P. | Non-phosgene route to the manufacture of organic isocyanates |
WO2002024634A3 (en) * | 2000-09-19 | 2002-05-30 | Arco Chem Tech | Non-phosgene route to the manufacture of organic isocyanates |
US6781010B1 (en) | 2000-09-19 | 2004-08-24 | Lyondell Chemical Company | Non-phosgene route to the manufacture of organic isocyanates |
CN100408557C (en) * | 2003-08-26 | 2008-08-06 | 河北工业大学 | Method for preparing 2,4-toluene diamino menthyl formate |
WO2007015852A2 (en) * | 2005-07-20 | 2007-02-08 | Dow Global Technologies Inc. | Heterogeneous supported catalytic carbamate process |
WO2007015852A3 (en) * | 2005-07-20 | 2007-05-24 | Dow Global Technologies Inc | Heterogeneous supported catalytic carbamate process |
EP1870398A1 (en) * | 2006-06-20 | 2007-12-26 | Repsol Ypf S.A. | One-pot catalytic process for the synthesis of isocyanates |
EP1870397A1 (en) * | 2006-06-20 | 2007-12-26 | Repsol Ypf S.A. | One-pot catalytic process for the synthesis of isocyanates and installations for the same |
US7423171B2 (en) | 2006-06-20 | 2008-09-09 | Repsol Ypf, S.A. | One-step catalytic process for the synthesis of isocyanates |
EP2036884A1 (en) | 2007-09-14 | 2009-03-18 | Repsol Ypf S.A. | Process for producing fluorinated isocyanates and carbamates |
WO2009098327A1 (en) * | 2008-02-06 | 2009-08-13 | Repsol Ypf, S.A. | Method for producing fluorinated carbamates and isocyanates with heterogeneous catalysts |
US8735621B2 (en) | 2008-07-04 | 2014-05-27 | Consejo Superior De Investigaciones Cientificas | Preparation of carbamates with solid catalysts |
US20110124902A1 (en) * | 2008-07-04 | 2011-05-26 | Consejo Superior De Investigaciones Cientificas C/Serrano, 117 | Preparation of carbamates with solid catalysts |
ES2331505A1 (en) * | 2008-07-04 | 2010-01-05 | Universidad Politecnica De Valencia | Preparation of carbamates with solid catalysts |
WO2010000888A1 (en) | 2008-07-04 | 2010-01-07 | Consejo Superior De Investigaciones Científicas | Preparation of carbamates with solid catalysts |
JP2011526606A (en) * | 2008-07-04 | 2011-10-13 | コンセホ・スペリオール・デ・インベスティガシオネス・シエンティフィカス | Formation of carbamate using solid catalyst |
CN102099327A (en) * | 2008-07-04 | 2011-06-15 | 西班牙高等科研理事会 | Preparation of carbamates with solid catalysts |
JP2012500784A (en) * | 2008-08-22 | 2012-01-12 | ビーエーエスエフ ソシエタス・ヨーロピア | Method for producing urethane comprising bifunctional aromatic amine and dialkyl carbonate |
US20110137067A1 (en) * | 2008-08-22 | 2011-06-09 | Basf Se | Method for producing urethanes composed of di-functional aromatic amines and dialkyl carbonates |
CN102131770B (en) * | 2008-08-22 | 2014-08-06 | 巴斯夫欧洲公司 | Method for producing urethanes composed of di-functional aromatic amines and dialkyl carbonates |
US8729291B2 (en) | 2008-08-22 | 2014-05-20 | Basf Se | Method for producing urethanes composed of di-functional aromatic amines and dialkyl carbonates |
WO2010020621A1 (en) * | 2008-08-22 | 2010-02-25 | Basf Se | Method for producing urethanes composed of di-functional aromatic amines and dialkyl carbonates |
EP2199278A1 (en) | 2008-12-19 | 2010-06-23 | Dow Global Technologies Inc. | Process for the Production of Aromatic Urethanes |
WO2010103155A1 (en) * | 2009-03-10 | 2010-09-16 | Consejo Superior De Investigaciones Científicas (Csic) (50%) | One-pot production of carbamates using solid catalysts |
ES2345028A1 (en) * | 2009-03-10 | 2010-09-13 | Universidad Politecnica De Valencia | One-pot production of carbamates using solid catalysts |
US8765993B2 (en) | 2009-03-10 | 2014-07-01 | Consejo Superior De Investigaciones Cientificas | One-pot production of carbamates using solid catalysts |
US20120203022A1 (en) * | 2009-10-21 | 2012-08-09 | Basf Se | Method for producing urethanes |
US8871965B2 (en) * | 2009-10-21 | 2014-10-28 | Basf Se | Method for producing urethanes |
US8927756B2 (en) | 2010-04-02 | 2015-01-06 | Asahi Glass Company, Limited | Method for producing carbamate compound, carbamate compound, and method for producing isocyanate compound using same |
US9260383B2 (en) | 2010-04-02 | 2016-02-16 | Asahi Glass Company, Limited | Method for producing carbamate compound, carbamate compound, and method for producing isocyanate compound using same |
CN103980160A (en) * | 2014-05-08 | 2014-08-13 | 南京工业大学 | Synthetic method of isophorone diamino methyl formate |
WO2019185608A1 (en) | 2018-03-28 | 2019-10-03 | Covestro Deutschland Ag | Heterogeneous catalysts for the synthesis of carbamates |
US11406964B2 (en) | 2018-03-28 | 2022-08-09 | Covestro Intellectual Property Gmbh & Co. Kg | Heterogeneous catalysts for the synthesis of carbamates |
Also Published As
Publication number | Publication date |
---|---|
EP1093452A1 (en) | 2001-04-25 |
AU3412799A (en) | 1999-10-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1093452A1 (en) | Method for the preparation of organic carbamates | |
KR970006475B1 (en) | Cyclic process for the preparation of (cyclo) aliphatic diisocyanates | |
CA2289658A1 (en) | Method for the preparation of carbamates | |
JPH0625136A (en) | Multistage process for continuously producing organic polyisocyanate | |
US8445713B2 (en) | Catalyst for the synthesis of organic carbonates, process for preparing the same and application thereof | |
EP0478075A2 (en) | Decarboxylation processes | |
JPH09510705A (en) | Polycarbamate, method for producing polycarbamate, and method for producing polyisocyanate | |
CN102356062A (en) | Process for preparing aromatic carbamates | |
CA2434231A1 (en) | Integrated process for the preparation of aromatic isocyanates and procedures for effecting the relative intermediate phases | |
EP0581131B1 (en) | A process for producing alkylene carbonates | |
EP1323708B1 (en) | Method for producing carbamates and method for producing isocyanates | |
US4611079A (en) | Process for the preparation of N-aryl di- or polyurethanes | |
WO1998056758A1 (en) | Process for the production of organic isocyanates | |
JP2005068148A (en) | Multi-stage method for continuously producing alicyclic diisocyanate | |
JPH0672982A (en) | Preparation of alkyl-mono- and -di-isocyanates | |
CA2033634A1 (en) | Method of manufacturing aromatic urethane | |
CA2235328A1 (en) | Preparation of organic diurethanes and/or polyurethanes and their use for preparing diisocyanates and/or polyisocyanates | |
JP4298995B2 (en) | Method for producing carbamate and method for producing isocyanate | |
WO1998055451A1 (en) | Method for the preparation of carbamates | |
JPH05148217A (en) | Preparation of diphenylmethane-base poly(o- alkylurethane) | |
EP1268409B1 (en) | Continuous process for the synthesis of aromatic urethanes | |
EP0480493A2 (en) | Processes for the preparation of nitrogen-containing compounds | |
WO1999050234A1 (en) | Novel urethane compounds and process for producing polycyclic aliphatic diisocyanate | |
CA2072034A1 (en) | Process for the preparation of bis-(ethoxycarbonylamino) toluenes and for the preparation of diisocyanatotoluenes therefrom | |
JP4134455B2 (en) | Method for producing carbamate compound |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW SD SL SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 1999915615 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 09646221 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: KR |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
WWP | Wipo information: published in national office |
Ref document number: 1999915615 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: CA |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1999915615 Country of ref document: EP |