Process for making thick multilayers of polyimide

摘要

A polyimide layer having a thickness greater than about 5 microns is formed on a substrate by coating a substrate with a solution of polymer and a solvent of the formula <IMAGE> wherein R1 and R2 are independently a hydrogen, a C1 to C6 alkyl moiety, or a <IMAGE> R5 is a C1 to C6 alkyl moiety; and R3 and R4 are independently hydrogen or a C1 to C6 alkyl moiety, and curing the resulting coated substrate.