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WO/1999/054289 |
The invention relates to a method for producing mixtures consisting of diphenylmethane diisocyanates and polyphenylene-polymethylene-polyisocyanates containing a reduced amount of chlorinated secondary products and with a reduced iodine ...
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WO/1999/048863 |
The present invention relates to the use of 3.5-Di.tert.-butyl-4-hydroxy-phenyl propionic acid esters for stabilisation of organic polyisocyanates.
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WO/1999/047493 |
Organic carbamates are prepared by the reaction of organic amines (preferably aromatic polyamines) with heteroatom-substituted alkyl carbonates. Said carbamates can be thermolysed into the corresponding isocyanates.
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WO/1999/041218 |
The present invention relates to a method of making alpha-methylstyrene dimers by combining a cobalt catalyst, a free-radical initiator and an alpha-methylstyrene monomer, in an inert atmosphere, to form a mixture. The mixture is heated ...
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WO/1999/040059 |
The invention relates to a method for the production of methylenedi(phenylamine) by reacting aniline with formaldehyde in the presence of acid catalysts. The method is characterized in that aniline and optionally an acid catalyst are tre...
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WO/1999/001428 |
Hydrazine derivatives of formula (I) wherein Y signifies CO or SO¿2?; R?1¿ signifies lower alkyl, lower alkenyl, lower cycloalkyl, lower cycloalkyl-lower alkyl, aryl or aryl-lower alkyl; R?2¿ signifies lower alkyl, halo-lower alkyl, a...
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WO/1998/056758 |
Process for the production of organic isocyanates comprising the following steps: (1) reacting an amine compound with an organic carbonate in the presence of a catalyst and an organic solvent; (2) removing the catalyst; (3) thermally dec...
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WO/1998/054129 |
Method for the preparation of polymeric isocyanates by decomposing polymeric ureas of the formula: R?1�(NHCONR?2�R?3�)�x? wherein x is at least 2, R?1� is an organic radical of valency x and R?2� and R?3� are monovalent org...
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WO/1998/054128 |
Method for the preparation of aromatic monomeric or polymeric isocyanates by decomposing aromatic monomeric or polymeric carbamates of the formula R?1�(NHCOOR?2�)�x? wherein x is at least 1, R?1� is an aromatic radical of valency...
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WO/1998/025888 |
Isocyanates are prepared by the 'cold-hot phosgenation' of primary amines which are not readily dissolved in chlorobenzene and/or o-dichlorobenzene. According to this process phosgene is dissolved in a solvent (A) consisting of chloroben...
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WO/1998/025680 |
The invention concerns a method of separating organic compounds by single- or multi-stage suspension crystallization, each stage consisting of a crystallizer, optionally a crystallizer vessel, and a filter (7) for separating the liquid p...
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WO/1998/025889 |
The invention concerns a method of separating a crystallizable organic compound from a liquid compound mixture by means of a single- or multi-stage suspension crystallization method, the crystals behind the final stage being separated by...
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WO/1998/022520 |
The invention relates to polyisocyanates containing tin in the form of compounds of quadrivalent and/or bivalent tin in a quantity ranging from 0.1 to 20 ppm tin with respect to the mass of the polyisocyanate, the polyurethane and/or the...
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WO/1998/019993 |
The invention concerns a process for obtaining pure isocyanate isomers from an isocyanate isomer mixture by crystallization in suspension and separation of isomerically pure crystals. The process is characterized in that, before separati...
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WO/1998/014425 |
This invention describes a method of forming bisulphite adducts of aliphatic isocyanates bearing an aromatic moiety by mixing an aqueous solution of a bisulphite adduct forming agent with a solution of an isocyanate bearing an aromatic m...
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WO/1997/045399 |
The invention discloses a product useful as monomer. This product is characterised in that when it is subjected to the action of an amount of phosphine of 0.005 mol per isocyanate function equivalent for one and a half hours at a tempera...
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WO/1997/031960 |
A composition containing one or more isocyanates that advantageously are not completely masked is disclosed. The composition includes a compound having an anionic function and a polyethylene glycol chain fragment of at least 5 and advant...
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WO/1997/025308 |
Products prepared by reacting polyisocyanates with alkenyl or alkynyl compounds; then with perfluoroalkyl iodides and dehydroiodinating the product.
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WO/1997/024320 |
A process and a system produces isocyanate and converts anhydrous hydrogen chloride, which is a by-product of isocyanate production, to chlorine gas in an electrochemical cell. The chlorine is recycled to the isocyanate process. Any unre...
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WO/1997/017323 |
The invention concerns a method of producing organic di- and/or polyurethanes by reacting organic di- and/or polyamines (a) with urea and/or carbamic acid alkyl esters (b) and alcohols (c) in the presence of soluble zirconium compounds, ...
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WO/1997/007092 |
Solid polyisocyanate particles having a particle size distribution index (PSDI) of less than 1.5 and which are preferably substantially free of induced impurities. Also claimed is a method for the preparation of such particles by prilling.
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WO/1996/016028 |
Isocyanates are prepared by a continuous process, by reacting appropriate primary amines with phosgene in the presence of an isocyanate as solvent. The primary amine optionally dissolved in an inert organic solvent is reacted with phosge...
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WO/1996/005171 |
4,4'-methylen-bis(3-chloro-2,6-dialkylphenylisocyanates) having the general formula (I) form polyisocyanates useful for producing polyurethane systems with high chemical resistance and good thermal stability.
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WO/1995/026332 |
A method for obtaining substantially pure toluene 2,6-diisocyanate from a mixture of the 2,4 and 2,6 isomers of toluene diisocyanate, wherein at least one crystallising-melting cycle is performed on the mixture of said isomers to separat...
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WO/1995/024384 |
Polycarbamates of a polyisocyanate and secondary alcohols are disclosed. These carbamates are characterized in being readily pyrolyzed to form the corresponding polyisocyanate and alcohol with low formation of tars and other by-products....
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WO/1995/018098 |
A process for preparing isocyanates comprising contacting carbon dioxide and a primary amine in the presence of an aprotic organic solvent and a base selected from the group consisting of a phosphazene compound, an organic, nitrogenous b...
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WO/1994/017032 |
A process for preparing isocyanates comprising (a) contacting carbon dioxide and a primary amine in the presence of an aprotic organic solvent and a base selected from the group consisting of a phosphazene compound, an organic, nitrogeno...
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WO/1994/008953 |
A process for preparing an isocyanate having at least two -N=C=O groups is provided which comprises preparing a substituted aromatic amine having at least two -NH2 groups, recovering the substituted aromatic amine having at least two -NH...
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WO/1994/008951 |
A process for preparing isocyanates comprising (a) contacting carbon dioxide and a primary amine in the presence of an aprotic organic solvent and a phosphazene compound or a mixture of a phosphazene compound and an organic, nitrogenous ...
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WO/1993/023367 |
Esters that are liquid at room temperature are used as solvents for isocyanates and/or isocyanurates and allow the viscosity of the isocyanates and/or isocyanurates to be drastically reduced.
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WO/1992/017442 |
The present invention relates to a process for producing isocyanates which comprises reacting an N-halogenated amide with an organic base in an essentially water-free modified Hofmann reaction using a soluble silver salt promoter in the ...
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WO/1990/009990 |
A process is described for the separation and recovery of isocyanate monomers from isocyanate concentrates which leaves a residue which is liquid and burnable. The process for the separation and recovery of isocyanate monomers from isocy...
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WO/1988/005430 |
A process for preparing diisocyanate compounds by the following two-step reaction without using phosgene. In the first step, a diamine and dimethyl carbonate are reacted with each other in the presence of an alkali catalyst to synthesize...
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WO/1987/005600 |
A process for preparing methyl isocyanate by heating phenyl N-methylcarbamate in a decomposition zone to produce a vapor stream containing phenol and methyl isocyanate, and thereafter rapidly separating the methyl isocyanate from the phe...
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JP2012240953 |
To provide a method for manufacturing tolylene diisocyanate by which the tolylene diisocyanate containing 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate in a desired isomeric ratio can be manufactured.The method for manufacturin...
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JP2012233014 |
To provide a process allowing long-term, stable production of isocyanates at a high yield without the various problems found in the prior art during production of isocyanates without using phosgene.The present invention discloses a proce...
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JP2012233004 |
To provide a method for producing polyisocyanate by which a reaction liquid can be stably circulated in a circulation line without installing a particular solution sending means, and the stable removal of hydrogen chloride from the react...
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JP2012153709 |
To provide a method for producing N-substituted carbamic ester suitable for transfer and storage, and further suitable for producing isocyanate.In the method for producing N-substituted carbamic ester, organic amine, a carbonic acid deri...
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JP2012153708 |
To provide a method for producing N-substituted carbamic ester, a composition for transfer and storage containing the N-substituted carbamic ester, and a method for producing isocyanate by thermal decomposition of the compound.A composit...
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JP2012152202 |
To provide a method for producing pentamethylene diisocyanate, capable of more easily producing pentamethylene diisocyanate at a low cost and at a high yield.Pentamethylene diisocyanate is produced by: obtaining an aqueous solution conta...
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JP2012097123 |
To provide a method for producing an isocyanate by using a composition comprising a carbamic acid ester and an aromatic hydroxy compound, which does not need to use any phosgene and does not have various problems like those in a conventi...
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JP2012067031 |
To provide a method of producing an N-unsubstituted carbamate capable of reducing generation of a by-product, the N-unsubstituted carbamate obtained by the production method, a production method for an isocyanate of producing the isocyan...
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JP2012017280 |
To provide a method for producing a toluene dicarbamate, by which the production of by-products can be reduced, to provide the toluene dicarbamate obtained by the production method, and to provide a method for producing toluene diisocyan...
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JP2012017278 |
To provide a method for producing a toluene dicarbamate, by which the production of by-products can be reduced, to provide the toluene dicarbamate obtained by the production method, and to provide a method for producing toluene diisocyan...
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JP2011236163 |
To provide a method for treating a carbonate for efficiently utilizing the carbonate.The method for treating the carbonate comprises: bringing at least one kind of the carbonate selected from dialkyl carbonate, diaryl carbonate and alkyl...
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JP2011201863 |
To provide pentamethylene diisocyanate enabling efficient preparation of a modified isocyanate and a polyurethane resin having excellent characteristics, a polyisocyanate resin obtained using the pentamethylene diisocyanate, a method for...
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JP2011201795 |
To provide a process for producing an alkylaryl carbamate which can industrially obtain the alkylaryl carbamate with good workability and productivity and an isocyanate which is obtained with the use of the alkylaryl carbamate.The alkyla...
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JP2011162442 |
To provide a method for treating a catalyst that reduces a production cost of an isocyanate while permitting industrially efficient production of the isocyanate.A primary amine, urea and/or an N-unsubstituted carbamic acid ester and an a...
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JP2011132175 |
To provide a method for treating an isocyanate residue, whereby the isocyanate residue obtained from a decomposition liquid of carbamate can be decomposed into an amine.The method for treating the isocyanate residue comprises: separating...
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JP2011132159 |
To provide a method of producing an aromatic polyisocyanate, employing a hydrochloride method and capable of shortening the operation time in its production process.The method of producing an aromatic polyisocyanate comprising a first re...
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