Patent ID: 9133353
Filing Date: 2015-09-15
Classification: C08G,C09D,G03F

Abstract:
1. A method for preparing a polyimide resin, the method comprising: a polymerization process resulting in 10 ppm to 200 ppm of the catalyst in the soluble polyimide resin after polymerization process, the polymerization process having the steps of: polymerizing a soluble polyimide resin using a monomer comprising one or more dianhydrides and aromatic diamines including a phenolic hydroxyl group, a carboxyl group, or a hydroxyl group, under the presence of a catalyst of triethylamine having a boiling point ranging from about 60° C. to about 100° C. in a solvent having a boiling point ranging from about 130° C. to about 180° C., and refluxing said soluble polyimide resin in the solvent until the remaining amount of the catalyst in the soluble polyimide resin is 10 ppm to 200 ppm, wherein the soluble polyimide resin is directly prepared without performing a step for preparing a polyamic acid precursor, wherein the polymerization is performed at a temperature ranging from 120° C. to 160° C. for five hours or less, wherein the catalyst is used in the amount of 0.5 weight parts to 30 weight parts over 100 weight parts of the monomers, and wherein a weight average molecular weight of the polyimide resin ranges from 1,000 to 100,000.