Provided is a composition for interfacial polymerizing polyamide including an amine compound; and one or more types of compounds selected from among a purine-based compound and a pyrimidine-based compound of Chemical Formula 1: ##STR00001## wherein, in Chemical Formula 1: X is N or NH; Y is O or OH; Z is O, OH or NH.sub.2; R1 and R2 are each hydrogen or a substituted or unsubstituted alkyl group; and is a single bond or a double bond, and a method for manufacturing a water-treatment membrane and a water-treatment membrane using the same.

Provided is a composition for interfacial polymerizing polyamide including an amine compound; and one or more types of compounds selected from among a purine-based compound and a pyrimidine-based compound of Chemical Formula 1: ##STR00001## wherein, in Chemical Formula 1: X is N or NH; Y is O or OH; Z is O, OH or NH.sub.2; R1 and R2 are each hydrogen or a substituted or unsubstituted alkyl group; and is a single bond or a double bond, and a method for manufacturing a water-treatment membrane and a water-treatment membrane using the same.

Methods for assessing and/or selecting as suitable for commercial release glatiramer acetate, including assessing the consumption, and/or relative reaction kinetics of one or more the amino acid N-Carboxyanhydrides (NCAs) present during the first step of the polymerization reaction in the glatiramer acetate manufacturing process are provided.

Methods for assessing and/or selecting as suitable for commercial release glatiramer acetate, including assessing the consumption, and/or relative reaction kinetics of one or more the amino acid N-Carboxyanhydrides (NCAs) present during the first step of the polymerization reaction in the glatiramer acetate manufacturing process are provided.

The present invention provides a semi-aromatic polyamide resin which is excellent in heat resistance and heat discoloration resistance, which can suppress a mold staining due to outgassing during melt molding, and which is excellent in melt fluidity, gelation characteristics and mechanical properties, wherein the semi-aromatic polyamide resin contains a constituent unit obtained from hexamethylenediamine and terephthalic acid and a constituent unit obtained from 11 -aminoundecanoic acid or undecane lactam, wherein a relative viscosity (RV) of the semi-aromatic polyamide resin is within a range of 2.65 to 3.50, and wherein a relationship among a concentration of terminal amino groups (AEG), a concentration of terminal carboxyl groups (CEG) and a concentration of terminal amino groups blocked by a monocarboxylic acid (EC) satisfies the specific formulae.

The present invention provides a semi-aromatic polyamide resin which is excellent in heat resistance and heat discoloration resistance, which can suppress a mold staining due to outgassing during melt molding, and which is excellent in melt fluidity, gelation characteristics and mechanical properties, wherein the semi-aromatic polyamide resin contains a constituent unit obtained from hexamethylenediamine and terephthalic acid and a constituent unit obtained from 11 -aminoundecanoic acid or undecane lactam, wherein a relative viscosity (RV) of the semi-aromatic polyamide resin is within a range of 2.65 to 3.50, and wherein a relationship among a concentration of terminal amino groups (AEG), a concentration of terminal carboxyl groups (CEG) and a concentration of terminal amino groups blocked by a monocarboxylic acid (EC) satisfies the specific formulae.

A method for producing a polycondensate powder dispersion, wherein the method includes at least one step of polycondensation: i) of at least one diester and at least one diamine, and/or ii) at least one amino ester, while stirring, in a solvent that can solubilize both the diamine and the diester and/or the amino ester but not the polyamide that forms during the polycondensation, at a temperature between 30° C. and the boiling temperature of the solvent, in order to produce a powder precipitate dispersed in the solvent.

A method for producing a polycondensate powder dispersion, wherein the method includes at least one step of polycondensation: i) of at least one diester and at least one diamine, and/or ii) at least one amino ester, while stirring, in a solvent that can solubilize both the diamine and the diester and/or the amino ester but not the polyamide that forms during the polycondensation, at a temperature between 30° C. and the boiling temperature of the solvent, in order to produce a powder precipitate dispersed in the solvent.

The present invention relates to a process for preparing a powder composition based on polyamide(s) with an optimized yield. The process includes a step of recycling a composition based on a polyamide prepolymer having a lower Dv50, by polycondensation of a mixture comprising said composition and one or more monomers in the presence of water. The invention also relates to the powder composition obtained and to the use thereof, especially for coating metal substrates by fluidized bed dip-coating.

The present invention relates to a process for preparing a powder composition based on polyamide(s) with an optimized yield. The process includes a step of recycling a composition based on a polyamide prepolymer having a lower Dv50, by polycondensation of a mixture comprising said composition and one or more monomers in the presence of water. The invention also relates to the powder composition obtained and to the use thereof, especially for coating metal substrates by fluidized bed dip-coating.