Patent ID: 8987376
Filing Date: 2015-03-24
Classification: C08G,C08L,C09D,H01L

Abstract:
1. A method of forming a polyimide film in a semiconductor device, said method comprising coating a base layer in said semiconductor device with a composition comprising: a mixed solvent of a first organic solvent (A) which is a hydrophobic solvent having a vapor pressure at room temperature of 1 mmHg or lower and a second organic solvent (B), which is a hydrophilic solvent having a vapor pressure at room temperature of 1 mmHg or lower; and a polyimide resin made from a tetracarboxylic dianhydride and a diamine, said polyimide resin having, in its main chain, a divalent group represented by the following formula [I] and at least one divalent group selected from the group consisting of a divalent group represented by the following formula [II] and a divalent group represented by the following formula [IV] wherein Rf represents a C 1 -C 4 perfluoroalkyl group, said polyimide resin being dissolved in said mixed solvent, wherein the percentage of the components having at least one divalent group selected from the group consisting of a divalent group represented by formula [II] and a divalent group represented by formula [IV] is from 20 mol % to 60 mol % based on the tetracarboxylic dianhydride components and diamine components constituting the polyimide, wherein said composition has a thixotropy coefficient of from 1.5 to 10.0.