Toray Industries, Inc.

Takae Ono

Toshiya Takahashi

Hiroaki Akasaka

Haruyo Sato

Kei Makita

Tomohiro Sakane

A process for producing fine particles of polyamide-imide resin includes a dissolution step and a precipitation step wherein the dissolution step is selected from steps (a1) and (b1); (a1) polyamide-imide resin is dissolved in an organic solvent to prepare a polyamide-imide resin solution A1 having a polyamide-imide resin content of less than 5 mass %; and (b1) polyamide-imide resin is dissolved in an organic solvent to prepare a polyamide-imide resin solution B1 having a polyamide-imide resin content of less than 10 mass %, and the precipitation step is selected from (a2) the polyamide-imide resin solution A1 is added to a solvent that is virtually free from surface active agents and able to precipitate fine particles of the polyamide-imide resin to cause precipitation of fine particles of the polyamide-imide resin, and (b2) the polyamide-imide resin solution B1 is subjected to flash crystallization to cause precipitation of fine particles of the polyamide-imide resin.

Process for production of polyamideimide resin microparticles, and polyamideimide resin microparticles

This invention provides a process for producing fine PPS resin particles and dispersion thereof by industrially applicable simple operation. This invention further provides very fine PPS resin particles, and furthermore provides fine PPS resin particles uniform in particle size. This invention is a process for producing fine polyphenylene sulfide resin particles comprising the following steps (a) and (b); (a) a step of heating a polyphenylene sulfide resin in an organic solvent, for obtaining a solution with the polyphenylene sulfide resin dissolved therein (dissolution step) (b) a step of flushing-cooling the aforementioned solution, for precipitating the fine particles of the polyphenylene sulfide resin (precipitation step).

Process for producing fine polyphenylene sulfide resin particles, fine polyphenylene sulfide resin particles, and dispersion thereof

A method for making an optically active 3-aminopyrrolidine-2,5-dione derivative represented by the formula (3) includes cyclizing an optically active asparagine ester derivative represented by the formula (1) or (2), or an acid salt thereof. A method for making an optically active 3-aminopyrrolidine derivative represented by the formula (9) includes reducing the optically active 3-aminopyrrolidine-2,5-dione derivative represented by the formula (3). A method for making an optically active 3-aminopyrrolidine derivative includes hydrogenolyzing the optically active 3-aminopyrrolidine derivative represented by the formula (9).

Growing community of inventors

Nagoya, Japan

Takae Ono