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Patent Searching and Data


Matches 301 - 350 out of 1,644

Document Document Title
WO/1998/025889A1
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...  
WO/1998/022520A1
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...  
WO/1998/019993A1
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...  
WO/1998/014425A1
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...  
WO/1997/045399A1
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...  
WO/1997/031960A1
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...  
WO/1997/025308A1
Products prepared by reacting polyisocyanates with alkenyl or alkynyl compounds; then with perfluoroalkyl iodides and dehydroiodinating the product.  
WO/1997/024320A1
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...  
WO/1997/017323A1
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, ...  
WO/1997/007092A1
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.  
WO/1996/016028A1
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...  
WO/1996/005171A1
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.  
WO/1995/026332A1
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...  
WO/1995/024384A1
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....  
WO/1995/018098A1
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...  
WO/1994/017032A1
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...  
WO/1994/008953A1
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...  
WO/1994/008951A1
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 ...  
WO/1993/023367A1
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.  
WO/1992/017442A1
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 ...  
WO/1990/009990A1
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...  
WO/1988/005430A1
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...  
WO/1987/005600A1
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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Matches 301 - 350 out of 1,644