- METHOD OF PREPARING DIISOCYANATE COMPOSITION
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In the embodiments, an aqueous hydrochloric acid solution instead of hydrogen chloride gas and solid triphosgene instead of phosgene gas may be used in the process of preparing a diisocyanate from a diamine through a diamine hydrochloride. In addition, the embodiments provide processes for preparing a diisocyanate composition and an optical lens, which are excellent in yield and quality with mitigated environmental problems by controlling the size of the diamine hydrochloride composition, the b* value according to the CIE color coordinate of the diamine hydrochloride composition, or the content of water in the diamine hydrochloride composition within a specific range.
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Paragraph 0246-0247; 0280-0282;
(2021/06/11)
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- METHOD OF PREPARING DIISOCYANATE COMPOSITION AND OPTICAL LENS
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In the embodiments, an aqueous hydrochloric acid solution and an organic solvent instead of hydrogen chloride gas and solid triphosgene instead of phosgene gas may be used in the process of preparing a diisocyanate from a diamine through a diamine hydrochloride. In addition, the embodiments provide processes for preparing a diisocyanate composition and an optical lens, which are excellent in yield and quality with mitigated environmental problems by controlling the total content of metals, cations, or anions in a diamine hydrochloride composition.
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Paragraph 0231-0234; 0242; 0277-0280
(2021/06/11)
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- Method for preparing polyisocyanate through photochemical reaction, and method for preparing waterborne polyurethane resin
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The invention especially relates to a method for preparing polyisocyanate through a photochemical reaction, and a method for preparing waterborne polyurethane resin, belonging to technical field of waterborne polyurethane resin. The method for preparing the waterborne polyurethane resin comprises a step of carrying out a polymerization reaction on raw materials containing polyisocyanate, oligomerpolyol, a chain extender and a hydrophilic agent to obtain the waterborne polyurethane resin, wherein the content of benzophenone impurities in the polyisocyanate is less than or equal to 0.045 wt%. By controlling the content of benzophenone impurities in the preparation process of polyisocyanate, the yellowing resistance of the waterborne polyurethane resin can be effectively improved, and harm to the qualified rate of downstream products caused by existence of the impurities in the waterborne polyurethane resin is also reduced.
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Paragraph 0128-0139
(2019/12/11)
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- Synthesis method of 1,3-dimethyl isocyanate cyclohexane
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The invention discloses a synthesis method of 1,3-dimethyl isocyanate cyclohexane. The method comprises the steps of pumping a metered inert solvent into reactor capable of performing stirring and with phosgene ingress pipe for bedding, performing cooling, beginning to continuously supply metered phosgene, dropwise adding a metered mixed solution of 1,3-hexamethylene dimethylamine and the inert solvent into a reaction system to form a mixture of 1,3-hexanaphthene dimethylamine hydrochloride and 1,3-hexanaphthene dimethylcarbamoyl chloride (a material in the reactor is slurry and the process isa cold photochemical reaction), after dropwise adding, heating to a reaction temperature (the process is a heat photochemical reaction), after the reaction, removing excessive phosgene and hydrogen chloride through nitrogen, and performing high vacuum rectification to form high-purity 1,3-dimethyl isocyanate cyclohexane. The method has the advantages that raw materials are easy to obtain, the solvent can be recycled, and the method is simple in technology, easy and simple to operate, higher in yield, mild in reaction condition and suitable for industrial production.
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Paragraph 0020; 0021; 0022; 0024; 0025; 0027; 0028; 0030
(2018/11/22)
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- The manufacturing method of the carbamate compounds
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The present invention addresses the problem of providing a method for producing an industrially-suitable carbamate compound without requiring a complicated operation, wherein a carbamate compound of a quality suitable for producing an isocyanate compound is produced by reacting a carbonate compound and an amine compound. Said problem is solved by a method for producing a carbamate compound characterized by reacting an amine compound and a carbonate compound under the presence of at least one base selected from a group comprising alkali metal alkoxides and alkaline earth metal alkoxides, and then adding 0.01 to 0.5 moles of water to 1 mole of an amino group of the amine compound, and further reacting the amine compound and carbonate compound.
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Paragraph 0130-0131; 0140-0141
(2017/10/07)
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- Preparation method of hydrogenated xylylene diisocynate
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The invention discloses a preparation method of hydrogenated xylylene diisocynate. The preparation method of the hydrogenated xylylene diisocynate comprises the following steps: (1) performing salt forming reaction on 1,3-cyclohexanol dimethylamine and concentrated hydrochloric acid in a two-phase reaction solvent to obtain amine salt, wherein the two-phase reaction solvent consists of water and an inert organic solvent insoluble in water ; (2) performing photochemical reaction on the ammonium salt obtained in the step (1) and phosgene in an inert solvent by taking N,N-dimethylformamide or N,N-dimethylacetamide as a catalyst to obtain reaction liquid, and performing aftertreatment on the reaction liquid to obtain the hydrogenated xylylene diisocynate. The preparation method of the hydrogenated xylylene diisocynate has the advantages of complete ammonium salt formation, small grain size of the ammonium salt, low viscosity of the ammonium salt, high space-time conversion rate of photochemical reaction, simple process, low cost and the like.
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Paragraph 0035-0039; 0040-0054
(2017/08/29)
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- METHOD FOR PRODUCING CARBAMATE COMPOUND
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PROBLEM TO BE SOLVED: To provide an industrially suitable method for producing a carbamate compound of quality suitable for producing an isocyanate compound by reacting a carbonate compound and an amine compound without requiring complicated operations. SOLUTION: There is provided a method for producing a carbamate compound, which comprises a step in which when a carbamate compound is produced by reacting an amine compound and a carbonate compound in the presence of at least one base selected from the group consisting of an alkali metal alkoxide and an alkaline earth metal alkoxide, the unreacted base is decomposed by adding water in an amount larger than the number of moles of the base used. COPYRIGHT: (C)2015,JPOandINPIT
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Paragraph 0090; 0092
(2017/07/25)
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- METHOD FOR PREPARING ALIPHATIC DIISOCYANATE
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The present invention relates to a method for preparing an aliphatic diisocyanate by pyrolyzing an aliphatic dicarbamate in liquid phase, using a tin (II) or (IV) compound as a catalyst and a zwitterionic compound as a stabilizer, thereby remarkably inhibiting high-boiling by-products and providing the aliphatic diisocyanate with high yield.
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Paragraph 0041
(2014/10/16)
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- COSMETIC OR DERMATOLOGICAL COMPOSITION COMPRISING A POLYMER BEARING JUNCTION GROUPS, AND COSMETIC TREATMENT PROCESS
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The present patent application relates to a cosmetic or dermatological composition comprising, in a cosmetically or dermatologically acceptable medium, a polymer comprising: (a) a polymer backbone that may be obtained by reaction: of a polyol comprising 3 to 6 hydroxyl groups;of a monocarboxylic acid containing 6 to 32 carbon atoms;of a polycarboxylic acid comprising at least two carboxylic groups COOH, and/or of a cyclic anhydride such as a polycarboxylic acid and/or of a lactone comprising at least one carboxylic group COOH; and(b) at least one junction group linked to the said polymer backbone and capable of establishing H bonds with one or more partner junction groups, each pairing of a junction group involving at least three H (hydrogen) bonds. The patent application also concerns a cosmetic treatment process using the said composition.
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- Sensitizer/Initiator Combination for Negative-Working Thermal-Sensitive Compositions Usable for Lithographic Plates
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The radiation-sensitive composition and the negative working imageable element include a cationic IR absorber with tetraarylborate counteranion and an onium initiator with tetraarylborate counteranion. The use of these components provides high imaging sensitivity, good shelflife and high print run length.
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- METHOD FOR PRODUCING ISOCYANATE COMPOUND
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The present invention relates to a method for preparing an isocyanate compound by introducing phosgene into an organic solvent solution of a carbonate of a corresponding amine compound and reacting the carbonate of the amine compound with phosgene, characterized in that the introduction of phosgene into the organic solvent solution of the carbonate is initiated at a temperature equal or lower than the temperature at which the carbonate is decomposed. According to the present invention, there is provided a method for advantageously preparing a less colored isocyanate compound industrially.
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Page/Page column 6
(2010/11/24)
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- Method for producing carbamates and method for producing isocyanates
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A method for producing carbamates that enables carbamates to be produced at low costs, with high selectivity and high yield, and in a simple manner, and a method for producing isocyanates that enables isocyanates industrially used to be produced by using the carbamates obtained by the carbamates producing method. Nonaromatic amine selected from the group consisting of aliphatic amine, alicyclic amine, and aralkyl amine is allowed to react with alkylaryl carbonate to thereby produce carbamates. Also, the carbamates thus obtained are thermally decomposed to thereby produce isocyanates. When carbamates are produced in this method, alkyl carbamates can be obtained with high selectivity and at high yield by using simple equipment. Also, when isocyanates are produced in this method, polyisocyanates used industrially as the raw material of polyurethane can be produced in a simple manner and with efficiency.
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- Synthesis of isocyanates from carbamate esters employing boron trichloride
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The conversion of carbamate esters to isocyanates and diisocyanates of industrial importance is possible using BCl3 in the presence of Et3N; the reaction is simple in execution and work-up, occurring under mild conditions and affording isocyanates in excellent yields.
- Butler,Alper
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p. 2575 - 2576
(2007/10/03)
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