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Matches 301 - 350 out of 1,680

Document Document Title
WO/1999/040059A1
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...  
WO/1999/001428A1
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...  
WO/1998/056758A1
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...  
WO/1998/054129A1
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...  
WO/1998/054128A1
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...  
WO/1998/025888A1
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...  
WO/1998/025680A1
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...  
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...  
JP2015077595A
【課題】ポリイソシアネート混合物を液相中 にて選択的透過膜を用いて分画する方法の提 供。【解決手段】ポリイソシアネート混合物 を、液相中にて、必要に応じて適切な溶...  
JP5700595B2  
JP5700575B2  
JP5699128B2  
JP5692964B2  
JP5686725B2  
JP5682622B2  
JPWO2013008891A1
アミン化合物とカーボネート化合物とから、 中間体として生成するカルバメート化合物を 単離・精製することなく、直接的又は連続的 にイソシアネート化合物を製造する方法...  
JPWO2012176631A1
本発明は、(i)50〜200℃の温度で下 記一般式(1)(式中の記号は明細書中に記 載の通り。)で示される三置換尿素化合物を 塩化水素を含有する溶液中で熱分解反応...  
JP5671550B2  
JP5666584B2  
JP5657709B2  
JP5657710B2  
JP2015501806A
イソシアネートを、流動床反応器(R)中で 、各アミンのホスゲン化によって製造する方 法であって、ホスゲンを含有するガス流(1 )を、流動化ガスとして使用し、前記ガ...  
JP2015501313A
本発明は、アミンを含む第一の反応物流を液 相で供給し、ホスゲンを含む第二の反応物流 を気相で供給し、任意に不活性媒体の存在下 で反応器(1)中において、相当するア...  
JP5650777B2  
JP2015500234A
本発明は、低い2,2’−MDI異性体含有 量と高い2,4’−MDI異性体含有量とを 有するメチレンジフェニルジイソシアネート (MDI)異性体混合物の製造方法及び...  
JP2014534053A
本発明の実施形態は、少なくとも円筒状の内 側表面または円筒状の外側表面と、数を増や したジェット開口部(102)とを有する混 合導管(100)を提供する。本発明の...  
JP5643517B2  
JP2014532616A
本発明は、MDAおよびメチレンブリッジを通し て組み込まれたo-フェニレンジアミン単位を する多環式芳香族ポリアミンを含む混合物 ホスゲン化による淡色ポリイソシアネ...  

Matches 301 - 350 out of 1,680