A method produces polyamide fine particles by polymerizing a polyamide monomer (A) in the presence of a polymer (B) at a temperature equal to or higher than the crystallization temperature of a polyamide to be obtained, wherein the polyamide monomer (A) and the polymer (B) are homogeneously dissolved at the start of polymerization, and polyamide fine particles are precipitated after the polymerization. Polyamide fine particles have a number average particle size of 0.1 to 100 μm, a sphericity of 90 or more, a particle size distribution index of 3.0 or less, a linseed oil absorption of 100 mL/100 g or less, and a crystallization temperature of 150° C. or more.

A new, thermally stable conducting material, poly(3-amino-1H-pyrazole-4-carboxylate), can be used in a variety of applications such as thermoelectrics, electron acceptors in light-harvesting (photovoltaic) materials, and thermally stable conducting energetic materials. Related compounds include poly 3-amino-5-chloro-1H-pyrazole-4-carboxylate, poly 3-amino-5-bromo-1H-pyrazole-4-carboxylate, poly 3-amino-5-fluoro-1H-pyrazole-4-carboxylate, poly 3-amino-5-iodo-1H-pyrazole-4-carboxylate, poly 3, 5-diamino-1H-pyrazole-4-carboxylate, poly 3-amino-5-NHR.sub.1-1H-pyrazole-4-carboxylate, poly 3-amino-5-NR.sub.2-1H-pyrazole-4-carboxylate, or poly 3-amino-5-hydroxy-1H-pyrazole-4-carboxylate.

Provided is a method for preparing nylon having triple shape memory effects, comprising the steps of generating amino acid, containing a biomass-derived pyrrolidone group, by using itaconic acid and a diamine; and generating a nylon copolymer by reacting the amino acid containing the pyrrolidone group and an α, ω-aliphatic amino acid. Therefore, provided is a bionylon having triple shape memory effects, capable of shape deformation, fixing and recovery through two steps and adjusting shape recovery temperature to a desired level by controlling the content of a reactant.

The present invention relates to a polyamide (PA) comprising recurring units X, Y, and Z and is represented by the following formula (1): wherein—n.sub.x, n.sub.y and n.sub.z are respectively the mole percent (mol. %) of each recurring units X, Y and Z; —10 mol %≤n.sub.x≤90 mol %; —0 mol %≤n.sub.y≤90 mol %; —0 mol %≤n.sub.z≤90 mol %; —n.sub.x+n.sub.y+n.sub.z≤100 mol. %; and —at least one of n.sub.y and n.sub.z is greater than 0 mol. %, and wherein—R.sub.1 is selected from the group consisting of a hydrogen, an alkyl, or an aryl—R′i, at each location, is independently selected from the group consisting of an alkyl, an aryl, an alkali or alkaline earth metal sulfonate, an alkyl sulfonate, and a quaternary ammonium; —i is an integer from 0 to 10; —R.sub.2 is selected from the group consisting of a bond, a C.sub.1-C.sub.15 alkyl and a C.sub.6-C.sub.30 aryl, optionally comprising one or more heteroatoms (e.g. O, N or S) and optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy (—OH), sulfo (—SO.sub.3M), C.sub.1-C.sub.6 alkoxy, C.sub.1-C.sub.6 alkylthio, C.sub.1-C.sub.6 acyl, formyl, cyano, C.sub.6-C.sub.15 aryloxy and C.sub.6-C.sub.15 aryl; —R.sub.3 is selected from the group consisting of a C.sub.1-C.sub.20 alkyl, a phenyl, an indanyl, and a napthyl, optionally comprising one or more heteroatoms (e.g. O, N or S) and optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy (—OH), sulfo (—SO.sub.3M), C.sub.1-C.sub.6 alkoxy, C.sub.1-C.sub.6 alkylthio, C.sub.1-C.sub.6 acyl, formyl, cyano, C.sub.6-C.sub.15 aryloxy and C.sub.6-C.sub.15 aryl; and —R.sub.4 is selected from the group consisting of a linear or branched C.sub.6-C.sub.14 alkyl, optionally comprising one or more heteroatoms (e.g. O, N or S) and optionally substituted with one or more substituents selected from the group consisting of a halogen, hydroxy (—OH), sulfo (—SO.sub.3M), C.sub.1-C.sub.6 alkoxy, C.sub.1-C.sub.6 alkylthio, C.sub.1-C.sub.6 acyl, formyl, cyano, and C.sub.6-C.sub.15 aryloxy and C.sub.6-C.sub.15 aryl; and —M in each of R.sub.2 to R.sub.4 is independently selected from the group consisting of H, Na, K, Li, Ag, Zn, Mg and Ca; with the provisios that —if recurring unit Y is formed from the condensation of p-xylylene diamine and a C12 dicarboxylic acid then: —30 mol %≤n.sub.x≤90 mol %; —0 mol %≤n.sub.y≤70 mol %; and —0 mol %≤n.sub.z≤70 mol %; —n.sub.x+n.sub.y+n.sub.z≤100 mol. %; and —If recurring unit Y is formed from the condensation of terephthalic acid with a diamine, R.sub.2 is selected from the group cons

A linear aliphatic polyamide obtained by polycondensation of at least one linear aliphatic unit chosen from a C6 to C12 alpha, omega-aminocarboxylic acid, a C6 to C12 lactam and a (Ca-diamine).(Cb-diacid) unit, with a representing the number of carbon atoms of the diamine and b representing the number of carbon of the diacid, a and b being between 4 and 18, the polyamide having a difference, expressed as an absolute value, between its total acidity and its total basicity of between 35 and 180, and a total basicity or a total acidity strictly less than 35 μeq/g. Also, a method for its preparation and to its uses in the textile field.

The invention relates to a method for producing a poly(anthranilamide) via the polymerisation of isatoic anhydride, preferably in the presence of a solvent, on a starter at a reaction temperature in the region of 110° C. to 300° C., wherein the starter comprises an aliphatic mono- or diamine with 5 to 13 carbon atoms, an araliphatic mono- or diamine with 7 to 15 carbon atoms, an aromatic diamine with 6 to 13 carbon atoms, a carboxylic acid amide of formula Ar—(C═O)NHR, where Ar represents an aromatic group substituted with an amine NH— or NH2 group and R represents an aromatic or aliphatic group, or a mixture of the above-mentioned starters, and wherein the solvent, if used, comprises an organic solvent, which is in liquid form at the reaction temperature, an ionic liquid or a mixture of these solvents, obtaining a poly(anthranilamide) based on the starter. The invention also relates to the poly(anthranilamide) obtained with the method according to the invention and to the use thereof in the production of fibres or composite materials.

A polyamide resin with an excellent balance of mechanical characteristics such as breaking strength and breaking elongation in a solid state, a molded body containing said polyamide resin, a laminate provided with a film or a sheet containing said polyamide resin, a medical device provided with the aforementioned molded body and/or the aforementioned laminate, and a production method of the aforementioned polyamide resin are provided. A polyamide resin is used which contains: a linear aliphatic dicarbonyl unit as unit (a); a linear aliphatic diamino unit as unit (b); at least one of a unit (b) and a unit (c), each of a prescribed structure; and a trivalent unit (e).

A polyamide resin with an excellent balance of mechanical characteristics such as breaking strength and breaking elongation in a solid state, a molded body containing said polyamide resin, a laminate provided with a film or a sheet containing said polyamide resin, a medical device provided with the aforementioned molded body and/or the aforementioned laminate, and a production method of the aforementioned polyamide resin are provided. A polyamide resin is used which contains: a linear aliphatic dicarbonyl unit as unit (a); a linear aliphatic diamino unit as unit (b); at least one of a unit (b) and a unit (c), each of a prescribed structure; and a trivalent unit (e).

A customizable polyamide polymer, in particular Nylon 66, Nylon 6, and copolyamides, having a high molecular weight, excellent color, and low gel content is disclosed. In particular, disclosed is a polymer having a relative viscosity greater than 50 as measured in a 90% strength formic acid solution; consistent viscosity with a standard deviation of less than 1; a gel content no greater than 50 ppm as measured by insolubles larger than 10 micron; an optical defect content of less than 2,000 parts per million (ppm) as measured by optical control system (OCS). The polymer can be made into monofilaments or a multifilament yarn.

A customizable polyamide polymer, in particular Nylon 66, Nylon 6, and copolyamides, having a high molecular weight, excellent color, and low gel content is disclosed. In particular, disclosed is a polymer having a relative viscosity greater than 50 as measured in a 90% strength formic acid solution; consistent viscosity with a standard deviation of less than 1; a gel content no greater than 50 ppm as measured by insolubles larger than 10 micron; an optical defect content of less than 2,000 parts per million (ppm) as measured by optical control system (OCS). The polymer can be made into monofilaments or a multifilament yarn.