| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyimide metal foil preferred as a totally polyimide substrate material and a method for surface processing a metal foil, which solve the problem of conventional metal foil laminates for a substrate that the use of a metal foil of low surface roughness results in low adhesive strength. SOLUTION: The polyimide coated metal foil comprises a low surface roughness metal foil with Ra of 0.2μm or less, and a polyimide coating film of 0.1 to5μm thickness which is provided on the surface of the metal foil; wherein the coating film is obtained from 2,2-bis(4-aminophenoxyphenyl) propane and an aromatic tetracarboxylic dianhydride or its derivative (acid, acid-ester or half ester of the acid). The method for surface processing the low surface roughness metal foil comprises applying an organic solvent solution of polyamic acid to provide polyimide on the surface of the low surface roughness metal foil with Ra of 0.2μm or less so that the thickness of the polyimide coating film will be 0.1 to 5μm after heating. COPYRIGHT: (C)2006,JPO&NCIPI |
