Class / Patent application number | Description | Number of patent applications / Date published |
528339000 | From at least two dicarboxylic acids or derivatives or mixtures thereof | 16 |
20100063245 | Semi-Crystalline Semi-Aromatic Polyamide - The invention relates to a semi-crystalline semi-aromatic polyamide comprising A-A-B-B units derived from (a) dicarboxylic acids consisting of a mixture of aromatic dicarboxylic acid and aliphatic dicarboxylic acid and (b) diamines consisting of a mixture of long chain aliphatic diamine and short chain aliphatic diamine, wherein (a-i) the aromatic dicarboxylic acid consists for at least 80 mole % of terephthalic acid, and (a-ii) the aliphatic dicarboxylic acid constitutes at least 5 mole % of the dicarboxylic acids, (b-i) the short chain aliphatic diamine constitutes at least 10 mole % of the diamines, and (c) the aromatic dicarboxylic acid and the long chain aliphatic diamine constitute 60-90 mole % of the total molar amount of dicarboxylic acids and diamines. | 03-11-2010 |
20110218319 | POLYARAMID FILMS COMPRISING FLUOROVINYLETHER FUNCTIONALIZED AROMATIC MOIETIES - Provided are polyaramid polymers and films made from the polymers, comprising repeat units of the condensation product of a fluorovinylether functionalized aromatic diacid chloride and an aromatic diamine, and methods to make the films. | 09-08-2011 |
20120029163 | METHOD OF PREPARING A HEAT-RESISTANT POLYAMIDE - The present invention relates to a method of prepairing a heat-resistant polyamide by carrying out condensation polymerisation with a monomer mixture including a diester compound and a diamine compound. The present invention provides an economical method of prepairing a heat-resistant polyamide in that a monomer, a raw material, is simply and chiefly prepared, and the polymerizing reaction time is short because it does not need solvent separately. | 02-02-2012 |
20120046439 | PROCESS FOR THE MANUFACTURE OF A SOLUTION OF SALTS OF DIACIDS/DIAMINE(S) - A method for manufacturing a solution of a diacid and diamine salt for manufacturing polyamide is described. A method for manufacturing an aqueous solution of diacid and diamine salts produced by mixing at least two diacids and at least one diamine, with a weight concentration of salt between 40% and 70%, including, in a first step, preparing an aqueous solution of diacid(s) and diamine(s) with a diacid/diamine mole ratio of less than 1 using one diacid and one diamine, and in a second step, adjusting the mole ratio of diacids/diamine(s) to a value of between 0.9 and 1.1, and fixing the weight concentration of salt by adding another diacid and, optionally, additional water and/or diamine is also described. | 02-23-2012 |
20120172572 | POLYAMIDE - The invention provides a polyamide having a dicarboxylic acid unit containing a decahydronaphthalenedicarboxylic acid unit in an amount of 60 mol % or more, and a diamine unit. | 07-05-2012 |
20130041128 | POLYAMIDE COMPOUND - A polyamide compound containing from 25 to 50 mol % of a diamine unit that contains at least 50 mol % of an alicyclic diamine unit represented by the following general formula (I); from 25 to 50 mol % of a dicarboxylic acid unit that contains a linear aliphatic dicarboxylic acid unit represented by the following general formula (II-1) and/or an aromatic dicarboxylic acid unit represented by the following general formula (II-2) in an amount of at least 50 mol % in total; and from 0.1 to 50 mol % of a constituent unit represented by the following general formula (III): | 02-14-2013 |
20130184431 | POLYAMIDE RESINS AND PROCESSES FOR MOLDING THEM - Provided is a polyamide resin having high heat resistance, excellent moldability and excellent mechanical properties. The polyamide resin comprises a diamine unit containing 70 mol % or more of a xylylenediamine unit and a dicarboxylic acid unit containing 70 mol % or more of a straight chain aliphatic dicarboxylic acid unit, wherein the xylylenediamine unit is composed of 50 to 95 mol % of p-xylylenediamine and 50 to 5 mol % of m-xylylenediamine; the straight chain aliphatic dicarboxylic acid unit is composed of 50 to 100 mol % of adipic acid and 0 to less than 50 mol % of sebacic acid or other straight chain aliphatic dicarboxylic acids; the molar ratio of reacted diamine units to reacted dicarboxylic acid units (the number of moles of reacted diamine units/the number of moles of reacted dicarboxylic acid units) is less than 0.994; and the polyamide resin has a number average molecular weight of 10,000 to 25,000 and a melting point of 285° C. or more. | 07-18-2013 |
20130190472 | POLYAMIDE COMPOSITES HAVING FLEXIBLE SPACERS - Provided are polyamide nanocomposites incorporating carbon nanotubes and other filler species. Also provided are related methods. | 07-25-2013 |
20130281655 | POLYAMIDE, POLYAMIDE COMPOSITION, AND METHOD FOR PRODUCING POLYAMIDE - The present invention relates to a polyamide obtainable by polymerizing an (a) dicarboxylic acid comprising at least 50 mol % of an alicyclic dicarboxylic acid and a (b) diamine comprising at least 50 mol % of a diamine having a substituent branched from a main chain. | 10-24-2013 |
20150065681 | Method of Preparing Prepolymer Particle - Disclosed herein is a method of preparing prepolymer particles. The method includes injecting a prepolymer in a solution state by bottom-up type injection to form prepolymer particles by removing a solvent from the prepolymer in a solution state. The method can prepare prepolymer particles, which can be used in solid-state polymerization, using a bottom-up type flash process. | 03-05-2015 |
20160130397 | METHOD FOR CONTINUOUSLY PRODUCING POLYAMIDE OLIGOMERS AND PRODUCING SEMICRYSTALLINE OR AMORPHOUS POLYAMIDES THAT CAN BE THERMOPLASTICALLY PROCESSED - The invention relates to a process for continuously preparing polyamide oligomers. This comprises continuous conveying of an aqueous solution of polyamide-forming monomers from a reservoir vessel into an oligomerization reactor, heating of the aqueous solution beyond a dissolution or storage temperature, the residence time of the monomer solution in the oligomerization reactor being limited and the pressure or the partial vapor pressure of the water being adjusted such that a conversion of monomers to polyamide oligomers does not exceed a maximum value and/or the polyamide oligomers formed do not phase-separate or spontaneously crystallize in solid form, and continuous discharge of the polyamide oligomers from the oligomerization reactor. A polyamide oligomer preparable by this process can be provided continuously in a mixture with water in a process for preparing a semicrystalline or amorphous, thermoplastically processible polyamide and then postcondensed to give a polyamide. This polyamide can be used for production of moldings by means of injection molding, multicomponent injection molding, injection molding/welding, extrusion, coextrusion, blow molding or thermoforming. | 05-12-2016 |
20160130398 | DEVICE FOR SYNTHESIZING A POLYMER WITH REDUCED FORMATION OF DEPOSITS IN THE REACTION CHAMBER - The invention relates to a device for synthesizing a polymer accompanied by separating a gaseous substance. Said device comprises: a reactor chamber ( | 05-12-2016 |
20160145388 | POLYAMIDE COPOLYMERS HAVING 2,5-FURAN DICARBOXAMIDE UNITS - Polyamide copolymers, and methods of making and using polyamide copolymers, having 2,5-furan dicarboxamide units are disclosed herein. Such polymers can be useful for engineering thermoplastics having advantageous physical and/or chemical properties. | 05-26-2016 |
20160159983 | DEVICE AND METHOD FOR SYNTHESIS OF A POLYMER UNDER SEPERATION OF A GASEOUS SUBSTANCE - The invention relates to a device for synthesis of a polymer under separation of a gaseous substance. Said device comprises a reaction chamber ( | 06-09-2016 |
20160200870 | DEVICE FOR THE SYNTHESIS OF A POLMER WITH EXTRACTION OF A GASEOUS SUBSTANCE COMPRISING A REACTION CHAMBER HAVING AT LEAST ONE CIRCULAR-CYLINDRICAL SECTION | 07-14-2016 |
20160376220 | PROCESS FOR PREPARING A DIAMINE/DICARBOXYLIC ACID SALT - The present invention also relates to a process for preparing a diamine/dicarboxylic acid salt wherein the dicarboxylic acid comprises an aromatic dicarboxylic acid and is provided in a powder form; the diamine is provided in a liquid form gradually dosed to the dicarboxylic acid powder, while keeping the dicarboxylic acid powder in constant movement; the processing temperature is above 0° C. and below the boiling temperature of the diamine and the melting temperature of the acid and the salt, and the reaction mixture comprises at most 5 wt. % of water. The present invention also relates to an anhydrous diamine/dicarboxylic acid salt obtainable by the process according to invention, or any embodiment thereof as described above. | 12-29-2016 |