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JP2005047854 |
To provide an organic polyisocyanate composition containing a specific phenolic compound, to provide a stabilizer composition for organic polyisocyanate comprising the specific phenolic compound and an organic phosphite, more specificall...
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JP2005041874 |
To provide a method for producing a mixture of diphenylmethane-based diisocyanates and polyisocyanantes.This method comprises (a) producing diphenylmethane-based diamines and polyamines including bicyclic methylenediphenyldiamines by rea...
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JP2004347598 |
To provide an improved method for determining the isomer composition of isocyanate isomer mixtures.In the method for determining the isomer composition of isocyanate isomer mixtures, the actual isomer composition of the isocyanate isomer...
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JP2004331667 |
To distill a mixture of isomeric diisocyanatodiphenylmethanes composed of at least 2,2'-diisocyanatodiphenylmethane, 2,4'-diisocyanatodiphenylmethane and 4,4'-diisocyanatodiphenylmethane.The mixture of isomeric diisocyanatodiphenylmethan...
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JP2004262892 |
To provide a method of producing an isocyanate compound by which the isocyanate compound can be produced at a high pyrolysis rate and in a high yield with a high selectivity.A carbamate compound is pyrolyzed in the presence of at least o...
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JP2004262835 |
To obtain an aromatic isocyanate by synthesizing an aromatic urethane by reaction between a diaryl carbonate and an aromatic amine by a simple and economical method practicable on an industrial scale and free of drawbacks involved in pri...
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JP2004250453 |
To provide a method for phosgenation of a (poly)amine, in which high yield and long life of a reactor are achieved.This method for producing a diisocyanate of the formula (I) OCN-R-NCO comprises heating a corresponding vapor diamine of t...
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JP2004231521 |
To provide a method for synthesizing 3-chloro-5-nitrotoluene according to mild reaction conditions.The method for synthesizing the 3-chloro-5-nitrotoluene is carried out as follows. 2-Methyl-4-nitroaniline is reacted with a chlorinating ...
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JP2004231522 |
To provide a method for synthesizing 3-bromo-5-nitrotoluene by which the synthetic time is shortened.The method for synthesizing the 3-bromo-5-nitrotoluene is carried out as follows. 2-Methyl-4-nitroaniline is reacted with bromine in ace...
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JP2004217743 |
To provide a method for manufacturing a blocked aromatic isocyanate compound which does not injure the activities of a hydrogenating catalyst.The aromatic isocyanate is blocked in two steps: a first step for blocking an isocyanate group ...
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JP2004175888 |
To provide a polyisocyanate composition which excels in the stability to moisture in a humid environment and in a closed vessel.The isocyanurate group-containing polyisocyanate composition has a phosphorus concentration of 0.1-20 ppm. Th...
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JP2004168778 |
To provide a manufacturing method of obtaining a desired alicyclic isocyanate with a high selectivity.The method comprises reacting an aromatic isocyanate with hydrogen in the presence of a supported catalyst containing ruthenium alone a...
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JP2004155685 |
To provide a polyisocyanate having a reduced color number.This method for producing the polyisocyanate, comprising reacting phosgene with a polyamine obtained by the polycondensation of aniline with formaldehyde, is characterized by pass...
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JP2004155761 |
To provide an improved method for recovering and refining toluene diisocyanate.This method for refining toluene diisocyanate is provided by reboiling a bottom product of a downstream side distillation column or a feed sent to the downstr...
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JP2004155760 |
To provide an improved method for recovering and refining toluene diisocyanate.This method for refining toluene diisocyanate from unrefined distillation feed containing toluene diisocyanate, an organic solvent and ≤2 wt. % phosgene is ...
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JP2004143173 |
To provide an improved method for recovery and purification of toluene diisocyanate (TDI).The method for purification of the TDI is carried out by (a) fractionating the crude distillation feed containing less than 2% by weight of phosgen...
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JP2004123666 |
To provide a method for producing a benzene derivative derived from biomass, and to obtain an aromatic polymer using the benzene derivative as a raw material, and to provide a method for producing the aromatic polymer in which all raw ma...
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JP2004123745 |
To obtain a higher throughput and cooling efficiency by quenching a reaction mixture in order to prevent thermal cracking of a diisocyanate and formation of by-products caused by heating in a reaction to form the diisocyanate by reacting...
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JP2004123746 |
To provide a method for production of a polyisocyanate of diphenylmethane series.This method comprises a step (a) reacting aniline and formaldehyde in the presence of HCl to convert to a product mixture containing a polyamine of the diph...
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JP2004107334 |
To provide a method for producing an isocyanate compound having less discoloration industrially advantageously.This method for producing the isocyanate compound by introducing phosgene into an organic solvent solution of a carbonate salt...
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JP2004099523 |
To provide a polymeric MDI having good reactivity, containing little impurities such as an acid component and a hydrolyzable chlorine, having very superior hue obtained by decoloring the discolored one, and hardly allowing the progress o...
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JP2004067669 |
To produce an isocyanate in a gas phase by reducing the changes in temperature with time and ununiformity of temperature distribution.This method for producing diisocyanate and/or triisocyanate by performing the reaction of phosgene with...
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JP2004059920 |
To provide an industrially simple and secure method for producing polyisocyanate based on diphenylmethane, with low color valency.The method for production of diphenylmethane based polyamine comprising a step (a) reacting aniline and for...
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JP3518052 |
PURPOSE: To obtain an organic isocyanate significantly reduced in discoloration by bleaching a discolored organic isocyanate with an ozone-contg. gas. CONSTITUTION: (A) A discolored organic isocyanate, pref. crude one, bottom one or modi...
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JP2004035429 |
To provide a method for crystallizing an isomer of a polyisocyanate by feeding a mixture of isomers of the polyisocyanate to a crystallizer to shorten a time for crystallization and separating the isomer while keeping the quality and the...
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JP2004035491 |
To provide an apparatus for producing an aromatic polyisocyanate with which the aromatic polyisocyanate can be obtained stably over a long period by preventing the formation of a fixedly deposited material in a heat exchanger and the plu...
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JP2004035490 |
To provide an apparatus for producing an aromatic polyisocyanate by which the aromatic polyisocyanate can be obtained stably over a long period by preventing the formation of a fixed material in a heat exchanger and the plugging of a pip...
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JP2004035492 |
To provide an apparatus for producing an aromatic polyisocyanate with which a phosgenation reaction can be stably carried out over a long period in the production of the aromatic polyisocyanate; and to provide a method for producing the ...
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JP2004035489 |
To provide an apparatus for producing an aromatic polyisocyanate by which the aromatic polyisocyanate is obtained stably over a long period by preventing plugging of a pipe in a heat exchanger; and to provide a method for producing the a...
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JP2004018507 |
To provide a method for producing an isocyanate having an isopropenyl group or a vinyl group, useful as a raw material for widely used polymers such as a urethane modifier, a raw material for plastic resins and the like.The method for pr...
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JP2004010613 |
To provide a method for production of 5-nitro-3, 4-dihydro-1(2H)-naphthalenone, 1, 5-naphthalenediamine and 1, 5-naphthalene diisocyanate.The producing method comprises a step converting 4-(2-nitrophenyl)-n-butyronitrile to 4-(2-nitrophe...
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JP3506758 |
PURPOSE: To obtain a new heterocyclic compound by reacting a (2-alkyl)acryloyl isocyanate with an azomethine-based compound and facilitate treatment of the (2-alkyl)acryloyl isocyanate by dissolving the new heterocyclic compound in a sol...
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JP2003313155 |
To provide a method for producing a polyisocyanate of diphenylmethane series having reduced color value.The polyisocyanate is obtained by (a) reacting aniline with formaldehyde in the presence of an acidic catalyst to form a polyamine- c...
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JP3485632 |
PURPOSE: To recover pure isocyanate and a pourable, non-dusting, granular material. CONSTITUTION: Pure isocyanate is recovered from an isocyanate-contg. residue of a phosgene/amine reaction mixture by continuously feeding such residue an...
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JP2003286241 |
To provide a method for producing an unsaturated alicyclic-aliphatic isocyanate in high yield from the corresponding unsaturated alicyclic-aliphatic amine as the starting material while retaining the unsaturated bond.The method for produ...
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JP3481658 |
PURPOSE: To improve reactivity of xylenolic acid whose reactivity with a diphenylmethane diisocyanate is low with the diphenylmethane diisocyanate. CONSTITUTION: In producing a blocked isocyanate by adding a toluene diisocyanate or a dip...
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JP2003267932 |
To provide a simple and economical method for producing a dinitronaphthalene isomer mixture in a high yield, and obtaining 1,5- dinitronaphthalene in a high rate.This method for producing the dinitronaphthalene isomer mixture is to use a...
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JP2003252846 |
To provide a method for producing a carbamate which can be obtained in high selectivity and high yield at a low cost by a simple method, and to provide a method for producing an isocyanate usable in industry, which can be produced by usi...
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JP3467293 |
PURPOSE: To obtain acyl isocyanates of high purity in high yields without danger by reacting oxalyl chloride with a salt selected from hydrohalides and sulfates of a specific amide /or a carbamate and then, heating the reaction mixture. ...
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JP2003192658 |
To overcome the demerit of the conventional method for producing an isocyanate by vapor-phase phosgenation of an amine.This method for producing an isocyanate comprises heating amine vapor and phosgene separately at 200°C-600°C and con...
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JP3436778 |
PURPOSE: To remarkably reduce color of the polyisocyanates by adding relatively small amount of reducing agent to the corresponding polyamines. CONSTITUTION: The present invention is directed to a process for the production of polymethyl...
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JP2003119235 |
To obtain a diphenylmethane polyisocyanate having low chromaticity.The manufacturing method comprises processes of: (a) reacting aniline with formaldehyde in the presence of an acid catalyst to prepare a polyamine; (b) (i) neutralizing a...
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JP3420604 |
PURPOSE: To prepare an isocyanate by a non-phosgenation route which can be carried out economically and commercially and by which the isocyanate can be prepared under mild reaction conditions in a short reaction time. CONSTITUTION: CO2 i...
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JP2003104948 |
To produce an aliphatic/alicyclic isocyanate by vapor-phase phosgenation of an amine while avoiding soiling of a reactor by formation of a solid deposit and clogging of a gas flow channel.An aliphatic/alicyclic diisocyanate or triisocyan...
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JP2003096043 |
To produce an aliphatic/alicyclic isocyanate by the phosgenation in gas phase of an amine while avoiding the contamination of a reactor and the blockade of a gas flow channel caused by the formation of solid deposits.This new method for ...
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JP2003055333 |
To provide a safe and simple refining method for removing a hydrolyzable chlorine compound from an organic isocyanate compound in industrial scale. In this refining method, organic isocyanates containing a hydrolyzable chlorine compound ...
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JP2003055332 |
To solve problems in which it was almost impossible to find out a simple and complete resolution method, though a method for avoiding various troubles on production caused by a reactivity of a reaction product was desired when producing ...
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JP2003048871 |
To provide a process for purifying polyisocyanates with high-melting and high-boiling points safely and stably in high yield. The polyisocyanates are heated at a temperature that the polyisocyanates are thermally not decomposed, and are ...
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JP2003012632 |
To provide a method for efficiently producing isocyanates useful as a wide range of raw materials for polymers such as a urethane modifying agent or a raw material for plastic resins in good yield.This method for producing the isocyanate...
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JP2002363151 |
To provide a method for simply producing an organic isocyanate scarcely causing discoloration in a high purity and high yield. This invention provides a method for producing the organic isocyanate, characterized by including a step for b...
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