| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 528336000 | Polymerizing in the presence of a specified material | 17 |
| 20080207869 | PROCESS FOR THE PRODUCTION OF POLYBENZIMIDAZOLE FROM A TETRAMINOBIPHENYL AND AN ISOPHTHALIC ACID - A single-stage melt polymerization process is demonstrated for production of a polybenzimidazole which comprises the following steps. First, a high intensity reactor having a means for controlling agitation and rate of, atmosphere, and temperature is provided. Second, the high intensity reactor is degassed and filled with nitrogen. Third, a tetraminobiphenyl (TAB), compound A and an isophthalic acid (IPA), compound B are provided. Fourth, the high intensity reactor is charged with compounds A and B. Fifth, compound A and compound B are reacted under high intensity agitation in an absence of catalyst, to temperature of between 340° C. to 430° C. to produce a polybenzimidazole having an IV of at least 0.45 and a plugging value of greater than or equal to 1.0 g/cm | 08-28-2008 |
| 20080269457 | Process For Producing Polyimide Fine Particle - A process for producing polyimide fine particles that involves subjecting a polyamic acid solution to a thermal imidization process to directly produce polyimide fine particles. In the process, relatively monodisperse, non-aggregating fine polyimide particles can be directly obtained without using thermal imidization catalysts that are difficult to remove from the reaction mixture or without using an azeotropic solvent to remove the water produced. | 10-30-2008 |
| 20100113737 | PRODUCTION METHOD OF POLYAMIDE RESIN - To provide a method for producing a polyoxamide resin by one-step polymerization without performing a pre-polycondensation step in a solvent, which is necessary in the conventional production of a polyoxamide resin. A method of mixing an oxalic acid diester and a diamine in a pressure-resistant vessel and subjecting the mixture to polymerization under pressure in the presence of an alcohol produced by a polycondensation reaction and then to melt polymerization at a temperature not lower than the melting point of the produced polymer preferably while extracting the alcohol, thereby producing a polyoxamide resin by one-step polymerization without using a solvent except for an alcohol that is produced by polycondensation of raw materials in the production process. | 05-06-2010 |
| 20100168376 | PRODUCTION OF A FUNCTIONALIZED POLYTRIAZOLE POLYMER - A method for the production of a functionalized polytriazole polymer, particularly a poly(1,2,4-triazole)-polymer, includes the steps of (a) mixing a hydrazine salt, particularly hydrazine sulfate, with at least an aromatic and/or heteroaromatic dicarboxylic acid and/or at least a dicarboxylic acid derivate in polyphosphoric acid and if necessary further components for obtaining a solution; (b) heating the solution in a protective gas atmosphere for obtaining polyhydrazides and adding aromatic and/or heteroaromatic primary amines to the solution; and (c) precipitating a polymer. If necessary, neutralization in a basic solution may be carried out. | 07-01-2010 |
| 20100267923 | SEMI-AROMATIC POLYAMIDE AND A METHOD FOR PREPARATION WITH LOW WASTEWATER DISCHARGE - The present invention relates to a semi-aromatic polyamide and a method for preparing it with low wastewater discharge. The semi-aromatic polyamide for the present invention is obtained by introducing aromatic dicarboxylic acid, aliphatic diamine containing 4˜14 carbon atoms and the wastewater generated during the previous prepolymerization into an autoclave for prepolymerization reaction and then further polymerizing the prepolymer. In this preparation method, the wastewater generated during polymerization is recycled, thus greatly reducing the wastewater discharge; the raw materials in the wastewater are effectively recycled, thus improving the utilization rate of raw materials; meanwhile, the diamine in the wastewater compensates that lost along with water discharge during prepolymerization, thus ensuring the Mole ratio balance between dicarboxylic acid monomer and diamine monomer. | 10-21-2010 |
| 20110034666 | CROSSLINKED ARAMID POLYMER - A crosslinked aramid polymer comprising a first aramid backbone which is crosslinked through a poly(meth)acrylic acid with a second aramid backbone. The crosslinked aramid polymer is obtained by polymerizing a monomeric aromatic diamine with a monomeric aromatic diacid, or halide or ester thereof in the presence of poly(meth)acrylic acid, followed by a curing step. The crosslinked aramid polymer is crosslinked through its amide bonds and can be made to a fiber, film or fibrid. | 02-10-2011 |
| 20120046437 | METHODS OF RING OPENING POLYMERIZATION AND CATALYSTS THEREFOR - A salt catalyst comprises an ionic complex of i) a nitrogen base comprising one or more guanidine and/or amidine functional groups, and ii) an oxoacid comprising one or more active acid groups, the active acid groups independently comprising a carbonyl group (C═O), sulfoxide group (S═O), and/or a phosphonyl group (P═O) bonded to one or more active hydroxy groups; wherein a ratio of moles of the active hydroxy groups to moles of the guanidine and/or amidine functional groups is greater than 0 and less than 2.0. The salt catalysts are capable of catalyzing ring opening polymerization of cyclic carbonyl compounds. | 02-23-2012 |
| 20130197184 | PROCESS FOR PREPARING ARAMID COPOLYMER - The invention concerns processes for forming a polymer comprising residues of 2-(4-amino phenyl)-5(6)amino phenyl benzimidazole (DAPBI), paraphenylene diamine, and terephthaloyl dichloride, comprising the steps of: (a) forming a slurry of DAPBI and paraphenylene diamine in a solvent system comprising an organic solvent and an inorganic salt; and (b) adding a stoichiometric amount of terephthaloyl dichloride to the slurry in a single addition and allowing the formation of the polymer. | 08-01-2013 |
| 20130203955 | PROCESS FOR FORMING AN ARAMID COPOLYMER - The invention concerns processes for forming a polymer comprising residues of 2-(4-amino phenyl)-5(6) amino phenyl benzimidazole (DAPBI), paraphenylene diamine (PPD), and terephthaloyl dichloride, comprising the steps of: (a) forming a slurry of DAPBI in a solvent system comprising an organic solvent and an inorganic salt; (b) adding terephthaloyl dichloride to the slurry terephthaloyl dichloride in the amount of up to one-half mole for every mole of DAPBI in the slurry; (c) agitating the slurry to react the DAPBI and terephthaloyl dichloride to form an oligomeric solution; (d) adding PPD to the oligomeric solution and agitating until substantially all of the PPD is dissolved, (e) adding terephthaloyl dichloride in an amount of greater than one mole for every mole of PPD in the solution to form a prepolymer solution; and (e) agitating the prepolymer solution to form a polymer. | 08-08-2013 |
| 20150080548 | PROCESS FOR FORMING AN ARAMID COPOLYMER - The invention concerns processes for forming polymer crumb comprising residues of 2-(4-amino phenyl)-5 (6) amino benzimidazole (DAPBI), paraphenylene diamine (PPD), and terephthaloyl dichloride, comprising the steps of: (a) forming a slurry of b mole percent DAPBI and y mole percent PPD in a solvent system comprising organic solvent and c weight percent of an inorganic salt, wherein the inorganic salt is present in an amount of at least 5 weight percent of the organic solvent, DAPBI and PPD being present in an amount sufficient for providing a polymer solution having a weight percent solids of 12 percent or greater on a polymer basis; and (b) contacting the slurry of step a) with a stoichiometric amount of terephthaloyl dichloride to form a product comprising the polymer; wherein the sum of y+b is 100 and the product of b×c is 225 or greater. | 03-19-2015 |
| 20150329672 | Polyamide Production Method - The polyamide production method of the present invention comprises the steps of: producing a low-order condensate by effecting a polycondensation reaction between a dicarboxylic acid component containing between about 5 and about 40 mol. % of terephthalic acid, and a diamine component containing between about 70 and about 100 mol. % of a xylylenediamine in which the content of paraxylylenediamine is between about 50 and about 100 mol. %, under conditions of a reaction temperature of at least about 200° C. and less than about 230° C.; discharging and cooling the low-order condensate at a pressure at or below atmospheric pressure, in an inert gas atmosphere; and subjecting the discharged and cooled low-order condensate to solid state polymerization. The production method makes it possible to obtain a polyamide having outstanding mechanical strength, heat resistance, colour tone and the like without problems such as gelling. | 11-19-2015 |
| 20150337084 | METHOD FOR PRODUCING POLYBENZOXAZOLE RESIN - A method for producing a polybenzoxazole resin, in which even when a polybenzoxazole precursor is heat treated at a low temperature, a polybenzoxazole resin that is excellent in mechanical properties, such as tensile elongation, and in chemical resistance, is suppressed in terms of coloration, and is high in transparency can be produced. A polybenzoxazole resin is formed by heating a polybenzoxazole precursor which is obtained by allowing an aromatic diaminediol and a diformyl compound or a dicarboxylic acid dihalide, to react with each other in a solvent containing an amide compound or a urea compound each having a specified structure, at 120° C. to 350° C. | 11-26-2015 |
| 20160075826 | PROCESS FOR MANUFACTURING POLYAMIDE - In one or a plurality of embodiments, a process for manufacturing polyamide without using PrO (propylene oxide) in synthesis is provided. In one or a plurality of embodiments, provided is a process for manufacturing polyamide, including steps (a) to (c): (a) reacting diacid dichloride monomer with at least two kinds of diamine monomers in a solvent so as to generate polyamide; and (b) removing hydrochloric acid physically out of a reaction system, the hydrochloric acid being generated during the reaction in the step (a); or (c) adding a trapping reagent capable of trapping hydrochloric acid, at any time at least before the step (a), at the same time of starting the step (a), or during the step (a), wherein at least one of the diamine monomers is a diamine monomer containing a carboxyl group, and the trapping reagent does not include propylene oxide. | 03-17-2016 |
| 20160083515 | HIGHLY FUNCTIONAL POLYAMIDE POLYMER, SPINNING DOPE COMPOSITION CONTAINING SAME, AND MOLDED PRODUCT THEREOF - Provided are a novel polyamide polymer obtained by polymerizing monomers including aromatic diamine substituted with a nitrile group and an amide group and an aromatic dibasic acid compound, a spinning dope comprising the same, and a polyamide molded article. A fiber obtained using the novel polyamide polymer according to the present invention, particularly, a fiber obtained by spinning the polymer according to the present invention may have high strength and high elasticity, such that the fiber may be applied to various industrial fields. | 03-24-2016 |
| 20160096924 | Polyamide Resin, Method for Preparing the Same, and Molded Article Including the Same - A polyamide resin is a polymer of an adipic acid-containing dicarboxylic acid component and an m-xylenediamine-containing diamine component, wherein the polymer includes about 100 ppm or less of phosphorus and about 100 ppm or less of sodium (Na), and has a gel content of about 0.5% or less as measured on a specimen prepared by melting about 10 g of the polymer at about 260° C., maintaining the molten polymer for about 30 minutes, and then cooling the molten polymer to room temperature. The polyamide resin can exhibit excellent heat resistance and can reduce or prevent gel generation upon polymerization or molding. | 04-07-2016 |
| 20160200869 | PROCESS FOR PRODUCING A THERMOPLASTIC POLYMER CONTAINING SEGMENTS OF A DIAMIDE | 07-14-2016 |
| 20160376407 | METHOD FOR PRODUCING POLYAMIDE RESIN - A polyamide resin is produced through polycondensation by melt-kneading a polyamide oligomer having a relative viscosity of from 1.1 to 1.3 and a water content of 3% by mass or less in a cylinder (S) of an extruder. The extruder includes open vents (OV | 12-29-2016 |
