ADHESIVE TAPE FOR ELECTRONIC PARTS AND LIQUID ADHESIVE

摘要

The present invention provide a novel polyimide which is soluble in organic solvents and excels in heat resistance, and to a process for producing the polyimide. The polyimide of the present invention comprises a repeating unit represented by the formula (1) and having a number average molecular weight of from 4,000 to 200,000.wherein X is -SO2- or -C(=O)-OCH2CH2O-C(=O)-, and R1, R2, R3 and R4 are independently an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.