Patent ID: 7459216

Claim:
A metal laminate manufactured by laminating a single layer of a polyimide copolymer to a metallic foil which metal laminate is subjected to an etching process to remove a portion of the metallic foil said etching process being conducted after the single layer of the polyimide copolymer is laminated to the metallic foil, said polyimide copolymer comprising two kinds of tetracarboxylic acid dianhydrides consisting of (A) isopropylidenebis (4- phenyleneoxy-4-phthalic acid) dianhydride and (B) 3,3′,4,4′-biphenyltetracarboxylic acid dianbydride, and two or three kinds of diamines consisting of (C) 6-amino-2-(p-aminophenyl) benzimidazole and (D) at least one kind of diamines consisting of bis(4-amninophenyl) ether (D 1 ) and phenylenedianhifle (D 2 ) and said polyimide copolymer being resistant to curling resulting from the metal laminate etching process so that the resulting etched metal laminate is substantially curl-free.