Oriented copper plate, copper-clad laminate, flexible circuit board, and electronic device

Abstract

According to this invention, an oriented copper plate which has a highly developed cube texture and has strength and breaking elongation greater than those of a conventional material having a cube texture, a copper-clad laminate, a flexible circuit board that is excellent in terms of folding flexibility, and an electronic device are provided, and a process for producing the oriented copper plate is established. This invention relates: an oriented copper plate, which contains 0.03% by mass to 1.0% by mass of Cr, the remainder of which is composed of copper and inevitable impurities, wherein the copper plate has a <100> main orientation so that the area percentage of a <100> preferred orientation region is not less than 60.0%, the region satisfying a condition that allows each of a thickness direction of the copper plate and a specific in-plane direction of the copper plate to have an orientation difference of not more than 15° with respect to a <100> basic copper crystal axis of unit lattice of copper, and wherein Cr precipitates having equivalent circle diameters of 4 nm to 52 nm are present at 300 precipitates/μmto 12000 precipitates/μm; a copper-clad laminate and a flexible circuit board using the copper plate; and an electronic devices equipped with the flexible circuit board.