Class / Patent application number | Description | Number of patent applications / Date published |
528347000 | Aryl ring-containing reactant | 17 |
20080287643 | Polyamides Formed From Metaxylylenediamine and Adipic and Having an Amino End Group Content of Less Than 15 Mmol/Kg - The present invention relates to novel and improved polyamides composed of meta-xylylenediamine and having an amino end group content of less than 15 mmol/kg. Also found have been processes for preparing these polyamides composed of meta-xylylenediamine and adipic acid and having an amino end group content of less than 15 mmol/kg, which comprises reacting salt solutions of adipic acid and m-xylylenediamine at temperatures of from 80 to 300° C. and a pressure of from 1 to 20 bar with removal of water. | 11-20-2008 |
20100048861 | POLYIMIDE RESIN AND LIQUID CRYSTAL ALIGNMENT LAYER AND POLYIMIDE FILM USING THE SAME - Disclosed is a polyimide resin, which is colorless and transparent and has superior properties, including mechanical properties and heat stability, and thus is usable in various fields, including semiconductor insulating films, TFT-LCD insulating films, transparent electrode films, passivation films, liquid crystal alignment layers, optical communication materials, protective films for solar cells, and flexible display substrates. Also, a liquid crystal alignment layer and a polyimide film using the polyimide resin are provided. | 02-25-2010 |
20110137009 | POLYAMIC ACID, POLYIMIDE, MANUFACTURING METHOD THEREOF, AND POLYIMIDE FILM - A polyamic acid that is a condensation reaction product of one or more acid anhydrides and one or more carbonate-based diamine compounds, along with a polyimide obtained by imidizing the polyamic acid, a method of manufacturing the same, and a polyimide film made therefrom. | 06-09-2011 |
20110245454 | METHOD FOR PRODUCING POLYAMIDE - A method of producing polyamide by the direct polycondensation of a diamine component and a dicarboxylic acid component without using a solvent, such as water. The diamine component containing 70 mol % or more of p-xylylenediamine is added to a reaction system containing the dicarboxylic acid component under pressure while maintaining the reaction system in a molten state. After the addition of the diamine component, the pressure of the reaction system is reduced to atmospheric pressure over 50 min or more at a pressure falling speed of 1.0 MPa/h or less. By the production method, polyamide with a small molecular weight dispersion is easily produced. | 10-06-2011 |
20120271031 | PROCESS FOR PRODUCTION OF POLYAMIDE - An economical batchwise production method of polyamide with good quality by the polycondensation in which a diamine component including 70 mol % or more of a xylylenediamine which includes 20 mol % or more of p-xylylenediamine is added to a dicarboxylic acid component in a batchwise reaction tank equipped with a partial condenser. The diamine component is added while maintaining the whole reaction system in fluid state under pressure. The pressure is reduced during the time that the molar ratio is within a specific range while continuing the addition. | 10-25-2012 |
20130018166 | SEMIAROMATIC POLYAMIDE AND METHOD FOR PRODUCING SAMEAANM Nakai; MakotoAACI KyotoAACO JPAAGP Nakai; Makoto Kyoto JPAANM Morimoto; MarikoAACI KyotoAACO JPAAGP Morimoto; Mariko Kyoto JPAANM Takeda; HirotakaAACI KyotoAACO JPAAGP Takeda; Hirotaka Kyoto JP - The semiaromatic polyamide of the present invention includes a terephthalic acid component and a diamine component, wherein the diamine component is any of 1,8-octanediamine, 1,10-decanediamine and 1,12-dodecanediamine, and the proportion of the triamine unit in relation to the diamine unit in the polyamide is 0.3 mol % or less. | 01-17-2013 |
20130172521 | METHOD FOR PRODUCING NYLON SALT POWDER, AND METHOD FOR PRODUCING NYLON - Disclosed is a method for producing a nylon salt powder, wherein in the production of a nylon salt powder by allowing a dicarboxylic acid powder to react, the content of water is regulated to be 5% by mass or less in relation to the total amount of the dicarboxylic acid powder and a diamine, the dicarboxylic acid powder is beforehand heated to a temperature equal to or higher than melting point of the diamine and equal to or lower than the melting point of the dicarboxylic acid, and while this heating temperature is being maintained, the diamine is added to the dicarboxylic acid powder in such a way that the dicarboxylic acid powder maintains the condition of being in powder form. | 07-04-2013 |
20150073120 | PRODUCTION METHOD FOR POLYAMIDE - The present invention is directed to a process for producing a polyamide, which process includes directly melt-polymerizing a diamine component including 70 mol % or more of p-xylylenediamine and a dicarboxylic acid component including 70 mol % or more of a C6 to C18 aliphatic dicarboxylic acid, in the absence of solvent in a batch-type reactor equipped with a stirring blade, the process including: (1) reacting the diamine component with the dicarboxylic acid component under a pressure condition of 0.2 to 0.5 MPa (Abs); (2) maintaining a vapor phase section of a reaction tank of the reactor at 200° C. or higher during reaction; (3) stirring the contents of the reaction tank, from the start of adding the diamine component until after completion of the addition and before the start of pressure falling, such that the stirring-related Froude number represented by a specific formula is adjusted to 0.0002 to 0.15; and (4) employing a stirring blade having no structural body in the horizontal direction or having a structural body in the horizontal direction, which body does not come into contact with the interface between the reaction mixture and the vapor phase section during stirring. In the polyamide production process, deposition of solid matter in the reaction tank vapor section and in a vapor pipe is suppressed, and incorporation into the product of unmelted solid matter originating from the deposits is reduced. | 03-12-2015 |
20150133628 | POLYAMINE AND METHOD FOR PRODUCING THEREOF - A method for producing a polyamine is described that provides excellent safety, a lot of flexibility regarding a variety of its productions, and that can produce a polyamine of high-molecular weight easily and inexpensively.
| 05-14-2015 |
20150291736 | METHOD FOR PRODUCING POLYAMIDE - The invention is a method for producing a polyamide having a melting point of 255° C. or higher through polycondensation of a mixed xylylenediamine containing paraxylylenediamine as a diamine component and a dicarboxylic acid component in a batch reactor, wherein when the diamine component is dropwise added to the dicarboxylic acid component kept in a melt state by heating it to a temperature not lower than a melting point thereof under a pressure of 0.1 MPaG or more with keeping the melt state of a reaction mixture, a temperature of the reaction mixture is maintained at 255° C. or lower until a molar ratio (diamine component/dicarboxylic acid component) of the reaction mixture reaches 0.8, and the temperature of the reaction mixture at the end of the dropwise addition is controlled to be not lower than the melting point of the polyamide. The method enables production of a polyamide having an improved hue and being advantageous with respect to quality. | 10-15-2015 |
20150361216 | PROCESS FOR THE PREPARATION OF A POLYAMIDE - The invention relates to a process for preparing a semi-aromatic polyamide from diamine and dicarboxylic acid, comprising steps of •(i) dosing a liquid diamine to an agitated powder comprising an aromatic dicarboxylic acid thereby forming a powder comprising a diamine/dicarboxylic acid salt (DD-salt), and •(ii) solid-state polymerizing the DD-salt to obtain the polyamide. | 12-17-2015 |
20160046768 | Method for Preparing Polyamideimide Fibrid - The invention provides a method for preparing a polyamideimide fibrid, characterized by comprising the following specific steps: step 1: reacting diamine monomer with trimellitic anhydride chloride in an aprotic polar solvent in the presence of a catalyst to obtain a polyamide acid polymer, and carrying out chemical cyclization dehydration on the polyamide acid polymer to obtain a polyamideimide polymer solution; step 2: diluting the polyamideimide polymer solution, adding the diluted polyamideimide polymer solution and precipitation solution to a precipitation machine, and mixing to obtain a polyamideimide fibrid suspension; and step 3: washing, filtering and drying the polyamideimide fibrid suspension to obtain a polyamideimide fibrid. The invention is characterized by simple process, the size and shape of the fibrid are easy to be controlled, and the fibrid can be directly used to prepare high performance paper. | 02-18-2016 |
528348000 | All reactants contain at least one aryl ring | 5 |
20110172388 | EASILY DYEABLE META-TYPE WHOLLY AROMATIC POLYAMIDE FIBER - There is provided an easily dyeable meta-type wholly aromatic polyamide fiber excellent in dyeability and acid resistance, and having a very small residual solvent content. The components or conditions of the coagulation bath are appropriately adjusted so as to achieve a coagulated form not having a skin core, plasticization drawing is performed at a specific ratio, and after completing a washing step, a dry heat treatment is performed at a specific temperature. | 07-14-2011 |
20110257359 | LOW SHRINKAGE, DYEABLE MPD-I YARN - The invention relates a heat-treated poly(metaphenylene isophthalamide) polymer fiber having a crystalline structure as represented by a carbonyl stretch peak at a wavelength of 1,650 cm−1 in a Raman spectra response which before coloration with a dye, shrinks linearly 0.4 percent or less when exposed to 285 degrees Centigrade for 30 minutes; and which after contact with an aqueous red dye solution for 1 hour at 120 degrees Centigrade, has an “L” value coloration of at least 40 units lower than the “L” value of the fiber before coloration. | 10-20-2011 |
20150126704 | PREPARATION METHOD OF POLYIMIDE - The present invention provides a preparation method of polyimide, comprising the following steps: a) carrying out a dehydration polymerization reaction on a diamine and an anhydride of an organic acid in a non-polar solvent to obtain a mixture, the non-polar solvent being one or more of arene, aliphatic hydrocarbon, halogenated arene and halogenated aliphatic hydrocarbon, and the anhydride of the organic acid being one or more of dianhydride and single anhydride: and b) filtering the mixture obtained in step a) and drying to obtain the polyimide. In the present invention, the dehydration polymerization reaction between the diamine and the anhydride of the organic acid can be carried out directly in the non-polar solvent to obtain the polyimide which cannot be dissolved in the non-polar solvent. Therefore, polyimide powder with fine particles can be obtained by directly filtering and drying the reaction mixture without washing. Not only complex washing and grinding processes are not needed, but also the production period is shortened, the production cost is reduced, and the large-scale production becomes more convenient. | 05-07-2015 |
20150353682 | PROCESS FOR THE PREPARATION OF DIAMINE/DICARBOXYLIC ACID SALTS AND POLYAMIDES THEREOF - The invention relates to a process for preparing a salt from diamine and dicarboxylic acid, the process comprising contacting a diamine gas, having a gas temperature T-gas, with a dicarboxylic acid, thereby forming a reaction mixture comprising diamine/dicarboxylic acid salt, wherein the dicarboxylic acid and the reaction mixture are kept at a temperature T-mixture of at least 10° C. below the lowest of the melting temperature of the dicarboxylic acid (Tm-acid) and the melting temperature of the resulting diamine/dicarboxylic acid salt (Tm-salt). The invention also relates to a process for preparing a polyamide comprising preparing a salt from diamine and dicarboxylic acid. | 12-10-2015 |
20160074817 | Halogen Resistant Amides, Polyamides, and Membranes Made From the Same - A halogen resistant polyamide is formed from the reaction product of an amine monomer and an acid chloride monomer wherein the amino group of the starting amine monomer is separated from the aromatic amine ring system by an alkyl group and (i) minimizes halogenation on the amine and (ii) minimizes N-halogenation at a pH range of approximately 7 to approximately 10.5. A membrane is made from the polyamide for use, for example, in a reverse osmosis desalination unit. | 03-17-2016 |