Polyimidfolie, ein Verfahren zu ihrer Herstellung, und eine mit Metallfolie verbundene Polyimidfolie

摘要

A polyimide film of birefringence less than 0.01 is formed by drawing a copolymerized polyimide comprising a block component and a random component which are molecularly bonded, wherein the block component of the polyimide comprises a first aromatic diamine compound and an aromatic tetracarboxylic acid compound, and wherein the random component of the polyimide comprises a second aromatic diamine compound and at least two aromatic tetracarboxylic acid compounds. The resulting polyimide film has high elasticity, a low thermal expansion equivalent to that of metal and low water absorbing properties. A method for its manufacture and a metal laminated plate having improved curl properties, in which the polyimide is used as the base material, are also disclosed.